I am still trying to find the correct classification for Betula 'Trost's
Dwarf.' Somebody said it depends on whether the leaves are fuzzy. Well, let me
tell you the entire leaf, petiole, & twig are fuzzier than a peach.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)

In article ,
[Iris Cohen] wrote...

I am still trying to find the correct classification for Betula 'Trost's
Dwarf.' Somebody said it depends on whether the leaves are fuzzy. Well, let me
tell you the entire leaf, petiole, & twig are fuzzier than a peach.

Well, FWIW,

http://plantsdatabase.com/go/51688/

says it's _Betula pendula_.

http://www.bonsai-bci.com/species/birch.html
http://www.bonsai-bci.com/species/botanical_index.html

agree, as do various other "hits" on my initial search.
Is there a reason to doubt this ID is correct? I didn't
see any pages giving it a different species name in a
cursory glance through the first few screens of search
results.

regards.

The french "INTA" complet classification of the Betula is a follows (copy
an paste):



Betula L. [1753, Sp. Pl. : 982] (Betulaceae) Ashburner (1980), Bean
(1950, 1 : 297-311 ; 1970, 1 : 414-434), Burte & al. (1992 : 1389-1391),
Govaerts (1996), Holub (1989), Jovet (1942), Peinado & Moreno (1989),
Schneider (1904 : 97-119), Winckler (1904) (Chamaebetula) T : B. alba
Cultivés : B. utilis D. Don et var. jacquemontii (Spach) Winckler [= B
jacquemontii Spach] à tronc très blanc, ...



- aetnensis Rafin. [1814, Giorn., 1 : 17] "etnensis" = B. pendula

- alba sensu 1 [1894, Fl. Fr. : 289], 2 [1905, Fl. Fr., 3 : 275, fig. 3319]
= B. pendula 1, 2

- alba L. [1753, Sp. Pl. : 982] Ga 6 @

subsp. alba 2n = 56 Ga 6

subsp. glutinosa (Berher) Holub [1989, Folia Geobot. Phytotax.,
28 (1) : 410, 426] 2n = 56 Ga 6

subsp. nana (L.) Bonnier & Layens [1894, Fl. Fr. : 289] º
B. nana 1

subsp. pubescens (Ehrh.) Celak. [1871, Prodr. Fl. Böhm. :
128] ; ead. comb. Bonnier & Layens [1894, Fl. Fr. : 289] = B. alba
subsp. alba 1

subsp. verrucosa (Ehrh.) Celak. [1871, Prodr. Fl. Böhm. :
128] = B. pendula

- alnobetula Ehrh. [1783, Gartenkalendar, ed. Hirschfeld, 2 : 192] (b.)
º Alnus alnobetula subsp. alnobetula

- alnus L. [1753, Sp. Pl. : 983] = Alnus glutinosa

var. a glutinosa L. [1753, Sp. Pl. : 983] (b.) º Alnus
glutinosa

var. b incana L. [1753, Sp. Pl. : 983] (b.) º Alnus
incana

- alnus Vill [1785, Fl. Vapinc. : 70] [nom. illeg.], non L. [1753, Sp. Pl.]
= ?

- ×aschersoniana Hayek [1908, Fl. Steierm. : 105] = B. ×aurata 3

- ×aurata Borckh. [1790, Vers. Forstbot. Beschr., 1 : 498] (B. alba
subsp. alba × pendula) 2n = 42, 56 4*

- borysthenica Klokov [1947, J. Bot. Acad. Sci. Ukr., 3 (1-2).: 18] = B.
alba subsp. glutinosa ? 4*

- callosa Notø [1901, Tromso Mus, Arskrift, 23 : 158] = B. alba subsp.
alba 4*

- carpatica Waldst. & Kit. ex Willd. [1805, Sp. Pl., 4 (1) : 464] = B.
alba subsp. glutinosa

- celtiberica Rothm. & Vasc. [1940, Bol. Soc. Brot., Sér. 2, 14 : 147] +
Ga (64) 4, 6

- concinna Gunnarsson in Lindman [1918, Svensk Fanerogampfl. : 202] = B.
alba subsp. alba

- cordata Loisel. [1810, Not. : 139] (b.) º Alnus cordata

- coriacea Gunnarsson in Lindman [1918, Svensk Fanerogampfl. : 201], non
Pampanini [1915, Nuov. Giorn. Bot. Ital., n. s., 22 ; 274] = B. alba
subsp. glutinosa

- crispa Aiton [1789, Hort. Kew., ed. 1, 3 : 339] = Alnus alnobetula

- ×fennica Dörfler [1902, Herb. Norm., 44 : 106] (B. nana × pendula)

- glutinosa Wallr. [1822, Sched. Crit. : 497], p.p., [nom. illeg.], non (L.)
L. [1759] = B. alba subsp. glutinosa

- gummifera Bertol. [1855, Fl. Ital., 10 : 229] = B. pendula

- ×hybrida Bechstein [1799, Arch. Bot. (Roemer), 2 : 74], non Blom [1786,
Vet. Akad. Nya Handl. Stockh., 7 : 186, tab. 6, fig. 13] = B. ×aurata

- incana Chaix [1785, Pl. Vapinc. : 70] [nom. illeg.], non L. fil.. [1781,
Suppl. : 417] = ?

- incana (L.) Pallas [1784], non L. fil.. [1781, Suppl. : 417] = Alnus
incana

- ×intermedia (Hartman) Thomas ex Gaudin. [1830, Fl. Helv., 6 : 176] (B.
alba subsp. alba × nana) 3

- laciniata Blom [1786, Vet. Akad. Nya Handl., 7 : 156, tab. 6, fig. 13]
= B. alba subsp. alba

- latifolia Tausch [1838, Flora (Regensb.), 21 ; 751] = B. alba subsp.
alba

- lobulata Kanitz [1863, Linnaea, 32 : 351] = B. pendula

- murithii Gaudin [1830, Fl. Helv., 6 : 179] = B. alba subsp. glutinosa

- nana L. [1753, Sp. Pl. : 983] 2n = 28 Ga 2, 3, 4, 5, 6

- odorata Bechstein [1797, Forstbot. : 294] = B. alba subsp. glutinosa

- ovata Schrank [1789, Baier. Fl., 1 : 419] = Alnus alnobetula subsp.
alnobetula

- oxycoviensis Besser [1809, Prim. Fl. Galic., 2 : 289] = B. pendula

- palmata Borckh. [1800, Handb. Forstb., 1 : 500] = B. alba subsp. alba

- palustris Salisb. [1796, Prodr. : 395] [nom. illeg.] º Alnus glutinosa

- pendula Roth [1788, Tent. Fl. Germ., 1 : 405] 2n = 28 Co, Ga 4, 6

- ×plettkei Junge [1905, Verh. Nat. Ver. Hamb., 13 : 89] = B. ×fennica
3

- ×pseudocarpatica Simonk. [1887, Enum. Fl. Transs. : 491] = B. ×aurea

- pubescens Ehrh. [1791, Beitr. Naturk., 6 : 98] = B. alba subsp. alba
2, 3, 4, 5

proles murithii (Gaudin) Rouy [1912, Fl. Fr., 13 : 519] =
B. alba subsp. glutinosa

subsp. carpatica (Willd.) Ascherson & Graebner [1898, Fl.
Nordostd. Flachl. : 253] = B. alba subsp. glutinosa 4

subsp. celtiberica (Rothm. & Vasc.) Rivas Martínez [1971,
Trab. Dep. Bot. Fisiol. Veg., 3 : 78] º B. celtiberica 4*

subsp. glutinosa Berher in L. Louis [1887, Fl. Vosges, éd. 2
: 205] (b.) º B. alba subsp. glutinosa

subsp. murithii (Gaudin) Nyman [1889, Consp. Fl. Eur.,
Suppl. 2 (1) : 282] = B. alba subsp. glutinosa

subsp. odorata (Bechstein) E.F. Warburg [ ] = B. alba
subsp. glutinosa

subsp. suecica Gunnarsson [ ] = B. alba subsp. alba

var. carpathica (Willd.) Koch [1838, Syn. Fl. Germ., ed. 1 :
662] = B. alba subsp. glutinosa 3

var. murithii (Gaudin) Gremli [1893] = B. alba subsp.
glutinosa 3

- ×pubescentoides Léveillé [1915, Bull. Géogr. Bot., sér. 4, 25 : 43] [nom.
illeg.] ׺ B. ×intermedia

- ×rhombifolia Tausch [1838, Flora (Regensb.), 38 : 752] = B. ×aurata

- ×seidliana Missbach [ ] = B. ×intermedia

- subarctica Orlova [1956, Fl. Murm. Prov., 3 : 124, 365] = B. alba
subsp. alba

- tomentosa Reitter & Abel [1803, Abh. Beschr. Holzarten, 1 : 17] = B.
alba subsp. alba

- tundrarum Perfiljev [1963, Bot. Zhurn., 58 : 1139] = B. nana subsp.
alba

- verrucosa Ehrh. [1791, Beitr. Naturk., 5 : 161] = B. pendula 3, 5

- virgata Salisb. [1796, Prodr. : 395] [nom. illeg.] º B. alba subsp.
alba

- viridis Chaix [1785, Pl. Vapinc. : 70] ; Chaix in Vill. [1786, Hist. Pl.
Dauph., 1 : 374] = Alnus alnobetula subsp. alnobetula



BETULACEAE : Alnus, Betula

"Iris Cohen" escribió en el mensaje
...
I am still trying to find the correct classification for Betula 'Trost's
Dwarf.' Somebody said it depends on whether the leaves are fuzzy. Well,
let me
tell you the entire leaf, petiole, & twig are fuzzier than a peach.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)

I am afraid I don't understand this one.
It seems to be using Betula alba as a current name?
PvR

schreef in berichtnieuws
...
The french "INTA" complet classification of the Betula is a follows (copy
an paste):



Betula L. [1753, Sp. Pl. : 982] (Betulaceae) Ashburner (1980), Bean
(1950, 1 : 297-311 ; 1970, 1 : 414-434), Burte & al. (1992 : 1389-1391),
Govaerts (1996), Holub (1989), Jovet (1942), Peinado & Moreno (1989),
Schneider (1904 : 97-119), Winckler (1904) (Chamaebetula) T : B.
alba Cultivés : B. utilis D. Don et var. jacquemontii (Spach) Winckler [= B
jacquemontii Spach] à tronc très blanc, ...



- aetnensis Rafin. [1814, Giorn., 1 : 17] "etnensis" = B. pendula

- alba sensu 1 [1894, Fl. Fr. : 289], 2 [1905, Fl. Fr., 3 : 275, fig.
3319] = B. pendula 1, 2

- alba L. [1753, Sp. Pl. : 982] Ga 6 @

subsp. alba 2n = 56 Ga 6

subsp. glutinosa (Berher) Holub [1989, Folia Geobot.
Phytotax., 28 (1) : 410, 426] 2n = 56 Ga 6

subsp. nana (L.) Bonnier & Layens [1894, Fl. Fr. : 289]
º B. nana 1

subsp. pubescens (Ehrh.) Celak. [1871, Prodr. Fl. Böhm. :
128] ; ead. comb. Bonnier & Layens [1894, Fl. Fr. : 289] = B. alba
subsp. alba 1

subsp. verrucosa (Ehrh.) Celak. [1871, Prodr. Fl. Böhm. :
128] = B. pendula

- alnobetula Ehrh. [1783, Gartenkalendar, ed. Hirschfeld, 2 : 192] (b.)
º Alnus alnobetula subsp. alnobetula

- alnus L. [1753, Sp. Pl. : 983] = Alnus glutinosa

var. a glutinosa L. [1753, Sp. Pl. : 983] (b.) º
Alnus glutinosa

var. b incana L. [1753, Sp. Pl. : 983] (b.) º Alnus
incana

- alnus Vill [1785, Fl. Vapinc. : 70] [nom. illeg.], non L. [1753, Sp.
Pl.] = ?

- ×aschersoniana Hayek [1908, Fl. Steierm. : 105] = B. ×aurata 3

- ×aurata Borckh. [1790, Vers. Forstbot. Beschr., 1 : 498] (B. alba
subsp. alba × pendula) 2n = 42, 56 4*

- borysthenica Klokov [1947, J. Bot. Acad. Sci. Ukr., 3 (1-2).: 18] =
B. alba subsp. glutinosa ? 4*

- callosa Notø [1901, Tromso Mus, Arskrift, 23 : 158] = B. alba subsp.
alba 4*

- carpatica Waldst. & Kit. ex Willd. [1805, Sp. Pl., 4 (1) : 464] = B.
alba subsp. glutinosa

- celtiberica Rothm. & Vasc. [1940, Bol. Soc. Brot., Sér. 2, 14 : 147]
+ Ga (64) 4, 6

- concinna Gunnarsson in Lindman [1918, Svensk Fanerogampfl. : 202] =
B. alba subsp. alba

- cordata Loisel. [1810, Not. : 139] (b.) º Alnus cordata

- coriacea Gunnarsson in Lindman [1918, Svensk Fanerogampfl. : 201], non
Pampanini [1915, Nuov. Giorn. Bot. Ital., n. s., 22 ; 274] = B. alba
subsp. glutinosa

- crispa Aiton [1789, Hort. Kew., ed. 1, 3 : 339] = Alnus alnobetula

- ×fennica Dörfler [1902, Herb. Norm., 44 : 106] (B. nana × pendula)

- glutinosa Wallr. [1822, Sched. Crit. : 497], p.p., [nom. illeg.], non
(L.) L. [1759] = B. alba subsp. glutinosa

- gummifera Bertol. [1855, Fl. Ital., 10 : 229] = B. pendula

- ×hybrida Bechstein [1799, Arch. Bot. (Roemer), 2 : 74], non Blom [1786,
Vet. Akad. Nya Handl. Stockh., 7 : 186, tab. 6, fig. 13] = B. ×aurata

- incana Chaix [1785, Pl. Vapinc. : 70] [nom. illeg.], non L. fil.. [1781,
Suppl. : 417] = ?

- incana (L.) Pallas [1784], non L. fil.. [1781, Suppl. : 417] = Alnus
incana

- ×intermedia (Hartman) Thomas ex Gaudin. [1830, Fl. Helv., 6 : 176]
(B. alba subsp. alba × nana) 3

- laciniata Blom [1786, Vet. Akad. Nya Handl., 7 : 156, tab. 6, fig. 13]
= B. alba subsp. alba

- latifolia Tausch [1838, Flora (Regensb.), 21 ; 751] = B. alba subsp.
alba

- lobulata Kanitz [1863, Linnaea, 32 : 351] = B. pendula

- murithii Gaudin [1830, Fl. Helv., 6 : 179] = B. alba subsp. glutinosa

- nana L. [1753, Sp. Pl. : 983] 2n = 28 Ga 2, 3, 4, 5, 6

- odorata Bechstein [1797, Forstbot. : 294] = B. alba subsp. glutinosa

- ovata Schrank [1789, Baier. Fl., 1 : 419] = Alnus alnobetula subsp.
alnobetula

- oxycoviensis Besser [1809, Prim. Fl. Galic., 2 : 289] = B. pendula

- palmata Borckh. [1800, Handb. Forstb., 1 : 500] = B. alba subsp. alba

- palustris Salisb. [1796, Prodr. : 395] [nom. illeg.] º Alnus
glutinosa

- pendula Roth [1788, Tent. Fl. Germ., 1 : 405] 2n = 28 Co, Ga 4,
6

- ×plettkei Junge [1905, Verh. Nat. Ver. Hamb., 13 : 89] = B. ×fennica
3

- ×pseudocarpatica Simonk. [1887, Enum. Fl. Transs. : 491] = B. ×aurea

- pubescens Ehrh. [1791, Beitr. Naturk., 6 : 98] = B. alba subsp. alba
2, 3, 4, 5

proles murithii (Gaudin) Rouy [1912, Fl. Fr., 13 : 519]
= B. alba subsp. glutinosa

subsp. carpatica (Willd.) Ascherson & Graebner [1898, Fl.
Nordostd. Flachl. : 253] = B. alba subsp. glutinosa 4

subsp. celtiberica (Rothm. & Vasc.) Rivas Martínez [1971,
Trab. Dep. Bot. Fisiol. Veg., 3 : 78] º B. celtiberica
4*

subsp. glutinosa Berher in L. Louis [1887, Fl. Vosges, éd.
2 : 205] (b.) º B. alba subsp. glutinosa

subsp. murithii (Gaudin) Nyman [1889, Consp. Fl. Eur.,
Suppl. 2 (1) : 282] = B. alba subsp. glutinosa

subsp. odorata (Bechstein) E.F. Warburg [ ] = B. alba
subsp. glutinosa

subsp. suecica Gunnarsson [ ] = B. alba subsp. alba

var. carpathica (Willd.) Koch [1838, Syn. Fl. Germ., ed. 1
: 662] = B. alba subsp. glutinosa 3

var. murithii (Gaudin) Gremli [1893] = B. alba subsp.
glutinosa 3

- ×pubescentoides Léveillé [1915, Bull. Géogr. Bot., sér. 4, 25 : 43]
[nom. illeg.] ׺ B. ×intermedia

- ×rhombifolia Tausch [1838, Flora (Regensb.), 38 : 752] = B. ×aurata

- ×seidliana Missbach [ ] = B. ×intermedia

- subarctica Orlova [1956, Fl. Murm. Prov., 3 : 124, 365] = B. alba
subsp. alba

- tomentosa Reitter & Abel [1803, Abh. Beschr. Holzarten, 1 : 17] = B.
alba subsp. alba

- tundrarum Perfiljev [1963, Bot. Zhurn., 58 : 1139] = B. nana subsp.
alba

- verrucosa Ehrh. [1791, Beitr. Naturk., 5 : 161] = B. pendula 3, 5

- virgata Salisb. [1796, Prodr. : 395] [nom. illeg.] º B. alba subsp.
alba

- viridis Chaix [1785, Pl. Vapinc. : 70] ; Chaix in Vill. [1786, Hist. Pl.
Dauph., 1 : 374] = Alnus alnobetula subsp. alnobetula



BETULACEAE : Alnus, Betula

"Iris Cohen" escribió en el mensaje
...
I am still trying to find the correct classification for Betula 'Trost's
Dwarf.' Somebody said it depends on whether the leaves are fuzzy. Well,
let me tell you the entire leaf, petiole, & twig are fuzzier than a peach.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the
oncoming
train."
Robert Lowell (1917-1977)

xfennica Dörfler [1902, Herb. Norm., 44 : 106] (B. nana x pendula)

That should be very interesting. Where can it be found?

As far as 'Trost's Dwarf' is concerned, it was registered in 1985 as a cultivar
of B. pendula, by the American Association of Botanical Gardens and Arboreta,
which is the registration authority for all the orphan genera.
Now that I have a chance to study it, it is a fascinating little tree. The
leave are like feathers, with the lobes drawn out into long laciniate tips. You
would never take it for a birch until it grows its white bark, which takes
several years in the ground. I don't know if it ever blooms.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)

INTA has 2 Betulas albas, Linneus and Flor de la France (Coste) which seems
wrong.
"sensu" in this case means "also".
"Ga" means France mainland in Europe, does not includ the island of Corcega.



"P van Rijckevorsel" escribió en el mensaje
...
I am afraid I don't understand this one.
It seems to be using Betula alba as a current name?
PvR

schreef in berichtnieuws
...
The french "INTA" complet classification of the Betula is a follows
(copy
an paste):



Betula L. [1753, Sp. Pl. : 982] (Betulaceae) Ashburner (1980), Bean
(1950, 1 : 297-311 ; 1970, 1 : 414-434), Burte & al. (1992 : 1389-1391),
Govaerts (1996), Holub (1989), Jovet (1942), Peinado & Moreno (1989),
Schneider (1904 : 97-119), Winckler (1904) (Chamaebetula) T : B.
alba Cultivés : B. utilis D. Don et var. jacquemontii (Spach) Winckler [=
B
jacquemontii Spach] à tronc très blanc, ...



- aetnensis Rafin. [1814, Giorn., 1 : 17] "etnensis" = B. pendula

- alba sensu 1 [1894, Fl. Fr. : 289], 2 [1905, Fl. Fr., 3 : 275, fig.
3319] = B. pendula 1, 2

- alba L. [1753, Sp. Pl. : 982] Ga 6 @

subsp. alba 2n = 56 Ga 6

subsp. glutinosa (Berher) Holub [1989, Folia Geobot.
Phytotax., 28 (1) : 410, 426] 2n = 56 Ga 6

subsp. nana (L.) Bonnier & Layens [1894, Fl. Fr. : 289]
º B. nana 1

subsp. pubescens (Ehrh.) Celak. [1871, Prodr. Fl. Böhm.
:
128] ; ead. comb. Bonnier & Layens [1894, Fl. Fr. : 289] = B. alba
subsp. alba 1

subsp. verrucosa (Ehrh.) Celak. [1871, Prodr. Fl. Böhm.
:
128] = B. pendula

- alnobetula Ehrh. [1783, Gartenkalendar, ed. Hirschfeld, 2 : 192]
(b.)
º Alnus alnobetula subsp. alnobetula

- alnus L. [1753, Sp. Pl. : 983] = Alnus glutinosa

var. a glutinosa L. [1753, Sp. Pl. : 983] (b.) º
Alnus glutinosa

var. b incana L. [1753, Sp. Pl. : 983] (b.) º
Alnus
incana

- alnus Vill [1785, Fl. Vapinc. : 70] [nom. illeg.], non L. [1753, Sp.
Pl.] = ?

- ×aschersoniana Hayek [1908, Fl. Steierm. : 105] = B. ×aurata 3

- ×aurata Borckh. [1790, Vers. Forstbot. Beschr., 1 : 498] (B. alba
subsp. alba × pendula) 2n = 42, 56 4*

- borysthenica Klokov [1947, J. Bot. Acad. Sci. Ukr., 3 (1-2).: 18] =
B. alba subsp. glutinosa ? 4*

- callosa Notø [1901, Tromso Mus, Arskrift, 23 : 158] = B. alba
subsp.
alba 4*

- carpatica Waldst. & Kit. ex Willd. [1805, Sp. Pl., 4 (1) : 464] =
B.
alba subsp. glutinosa

- celtiberica Rothm. & Vasc. [1940, Bol. Soc. Brot., Sér. 2, 14 : 147]
+ Ga (64) 4, 6

- concinna Gunnarsson in Lindman [1918, Svensk Fanerogampfl. : 202] =
B. alba subsp. alba

- cordata Loisel. [1810, Not. : 139] (b.) º Alnus cordata

- coriacea Gunnarsson in Lindman [1918, Svensk Fanerogampfl. : 201], non
Pampanini [1915, Nuov. Giorn. Bot. Ital., n. s., 22 ; 274] = B. alba
subsp. glutinosa

- crispa Aiton [1789, Hort. Kew., ed. 1, 3 : 339] = Alnus alnobetula

- ×fennica Dörfler [1902, Herb. Norm., 44 : 106] (B. nana × pendula)

- glutinosa Wallr. [1822, Sched. Crit. : 497], p.p., [nom. illeg.], non
(L.) L. [1759] = B. alba subsp. glutinosa

- gummifera Bertol. [1855, Fl. Ital., 10 : 229] = B. pendula

- ×hybrida Bechstein [1799, Arch. Bot. (Roemer), 2 : 74], non Blom
[1786,
Vet. Akad. Nya Handl. Stockh., 7 : 186, tab. 6, fig. 13] = B. ×aurata

- incana Chaix [1785, Pl. Vapinc. : 70] [nom. illeg.], non L. fil..
[1781,
Suppl. : 417] = ?

- incana (L.) Pallas [1784], non L. fil.. [1781, Suppl. : 417] =
Alnus
incana

- ×intermedia (Hartman) Thomas ex Gaudin. [1830, Fl. Helv., 6 : 176]
(B. alba subsp. alba × nana) 3

- laciniata Blom [1786, Vet. Akad. Nya Handl., 7 : 156, tab. 6, fig. 13]
= B. alba subsp. alba

- latifolia Tausch [1838, Flora (Regensb.), 21 ; 751] = B. alba
subsp.
alba

- lobulata Kanitz [1863, Linnaea, 32 : 351] = B. pendula

- murithii Gaudin [1830, Fl. Helv., 6 : 179] = B. alba subsp.
glutinosa

- nana L. [1753, Sp. Pl. : 983] 2n = 28 Ga 2, 3, 4, 5, 6

- odorata Bechstein [1797, Forstbot. : 294] = B. alba subsp.
glutinosa

- ovata Schrank [1789, Baier. Fl., 1 : 419] = Alnus alnobetula subsp.
alnobetula

- oxycoviensis Besser [1809, Prim. Fl. Galic., 2 : 289] = B. pendula

- palmata Borckh. [1800, Handb. Forstb., 1 : 500] = B. alba subsp.
alba

- palustris Salisb. [1796, Prodr. : 395] [nom. illeg.] º Alnus
glutinosa

- pendula Roth [1788, Tent. Fl. Germ., 1 : 405] 2n = 28 Co, Ga
4,
6

- ×plettkei Junge [1905, Verh. Nat. Ver. Hamb., 13 : 89] = B.
×fennica
3

- ×pseudocarpatica Simonk. [1887, Enum. Fl. Transs. : 491] = B.
×aurea

- pubescens Ehrh. [1791, Beitr. Naturk., 6 : 98] = B. alba subsp.
alba
2, 3, 4, 5

proles murithii (Gaudin) Rouy [1912, Fl. Fr., 13 : 519]
= B. alba subsp. glutinosa

subsp. carpatica (Willd.) Ascherson & Graebner [1898,
Fl.
Nordostd. Flachl. : 253] = B. alba subsp. glutinosa
4

subsp. celtiberica (Rothm. & Vasc.) Rivas Martínez
[1971,
Trab. Dep. Bot. Fisiol. Veg., 3 : 78] º B. celtiberica
4*

subsp. glutinosa Berher in L. Louis [1887, Fl. Vosges,
éd.
2 : 205] (b.) º B. alba subsp. glutinosa

subsp. murithii (Gaudin) Nyman [1889, Consp. Fl. Eur.,
Suppl. 2 (1) : 282] = B. alba subsp. glutinosa

subsp. odorata (Bechstein) E.F. Warburg [ ] = B. alba
subsp. glutinosa

subsp. suecica Gunnarsson [ ] = B. alba subsp. alba

var. carpathica (Willd.) Koch [1838, Syn. Fl. Germ., ed.
1
: 662] = B. alba subsp. glutinosa 3

var. murithii (Gaudin) Gremli [1893] = B. alba subsp.
glutinosa 3

- ×pubescentoides Léveillé [1915, Bull. Géogr. Bot., sér. 4, 25 : 43]
[nom. illeg.] ׺ B. ×intermedia

- ×rhombifolia Tausch [1838, Flora (Regensb.), 38 : 752] = B. ×aurata

- ×seidliana Missbach [ ] = B. ×intermedia

- subarctica Orlova [1956, Fl. Murm. Prov., 3 : 124, 365] = B. alba
subsp. alba

- tomentosa Reitter & Abel [1803, Abh. Beschr. Holzarten, 1 : 17] =
B.
alba subsp. alba

- tundrarum Perfiljev [1963, Bot. Zhurn., 58 : 1139] = B. nana subsp.
alba

- verrucosa Ehrh. [1791, Beitr. Naturk., 5 : 161] = B. pendula 3,
5

- virgata Salisb. [1796, Prodr. : 395] [nom. illeg.] º B. alba subsp.
alba

- viridis Chaix [1785, Pl. Vapinc. : 70] ; Chaix in Vill. [1786, Hist.
Pl.
Dauph., 1 : 374] = Alnus alnobetula subsp. alnobetula



BETULACEAE : Alnus, Betula

"Iris Cohen" escribió en el mensaje
...
I am still trying to find the correct classification for Betula
'Trost's
Dwarf.' Somebody said it depends on whether the leaves are fuzzy.
Well,
let me tell you the entire leaf, petiole, & twig are fuzzier than a peach.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the
oncoming
train."
Robert Lowell (1917-1977)

In article , P van
Rijckevorsel writes
I am afraid I don't understand this one.
It seems to be using Betula alba as a current name?
PvR

I think he's referring to the Synonymy of the French Flora at INRA
(URL:http://www.inra.fr/Internet/Centres/...df/consult.htm
#Recherche).

This doesn't give a complete classification - only taxa found in France
- but has some utility for tracking down synonyms of European (and
naturalised) species. (I've found some synonyms for Malva and Lavatera
species here that are (were?) missing from IPNI.)

The web page has accepted taxa emboldened. It turns out to use Betula
alba instead of Betula pubescens (presumably instead of rejecting Betula
alba as a nomen ambiguum, or whatever the terminology is); Betula pendul
is also recognised. Betula alba is used that much nowadays, but Tilia
vulgaris, which I believe is a similar case, still gets a fair but of
usage.
--
Stewart Robert Hinsley
http://www.malvaceae.info/

Iris Cohen schreef
As far as 'Trost's Dwarf' is concerned, it was registered in 1985 as a
cultivar of B. pendula, by the American Association of Botanical Gardens and
Arboreta, which is the registration authority for all the orphan genera.

+ + +
Actually only the orphan genera of woody plants.
Makes quite a bit of difference.
PvR

Stewart Robert Hinsley schreef
Betula alba is not used that much nowadays, but Tilia vulgaris, which I
believe is a similar case, still gets a fair but of usage.

+ + +
Betula alba and Tilia vulgaris cannot be similar cases as Betula alba is a
nomen utique rejiciendum:
http://www.bgbm.fu-berlin.de/iapt/no...s/0115Appendix
IV05.htm and Tilia vulgaris is not.
Betula alba cannot be used, ever.
PvR

schreef
INTA has 2 Betulas albas, Linneus and Flore de la France (Coste) which
seems wrong.
"sensu" in this case means "also".
"Ga" means France mainland in Europe, does not includ the island of
Corcega.

+ + +
Seems more likely that "sensu" in this case means "sensu" (= "as used by")
PvR