"K Barrett" wrote in message
. net

This is one of the dendrobiums that usually make up the phalaenopsis type
of dendrobiums. If it isn't blooming for you try increasing the amount

Well, as far as i know there are two dendrobiums called 'compactum'.

One is the D. bigibbum var. compactum Lindley (called also D. lithocola)
with big (for the size) rose/lavender flowers, clearly of the D.
phalaenopsis group, currently sold everywhere under the wrong name D.
compactum.

The other is Dendrobium compactum Rolfe, section Stachyobium, from
indocina, with little greenish flowers, that have ovoid pseudobulbs not
more then 5-6 cm. I think is much more rarer in culture.
Here the description:
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64. Dendrobium compactum Rolfe ex W. Hackett, Gard. Chron. ser. 3, 36:
400. 1904.
Plants short.
Stems golden yellow from previous year, cylindrical, +/- fusiform,
1.5--3 cm, fleshy, with leaf sheaths 4--5 mm in diam., with 3--6 nodes,
current ones enclosed in leaf sheaths.
Leaves 2--5 in two rows, alternate, proximal ones smaller than distal
ones, oblong, 1--2.5 X 4--6 cm or broader, herbaceous, base dilated into
sheaths, apex obtuse and unequally 2-lobed; leaf sheath loosely
clasping, obliquely dram-shaped[??], papery, sheath mouth obliquely
truncate.
Racemes 1--5, erect, arising terminally or laterally on distal part of
current year's stem, not exceeding leaves, usually 1--2 cm, with 3--6
small flowers; floral bracts ovate-lanceolate, 2--3 X ca. 1 mm,
1-veined, apex acute.
Pedicel and ovary ca. 4 mm. Flowers spreading.
Abaxial sepal ovate-oblong, ca. 4 X 1.8 mm, 3-veined, apex acute;
lateral sepals obliquely triangular-lanceolate, ca. 4 mm, 3- or
4-veined, base oblique, to 3.5 mm wide, apex acute; mentum conical.
Petals white, suborbicular, ca. 4 X 1.7 mm, margin slightly undulate,
apex acute.
Labellum pale green, suborbicular, ca. 5 X 4 mm, inconspicuously
3-lobed; lateral lobes suborbicular, margin finely toothed above middle;
midlobe broadly ovate-triangular, apex mucronate, margin cristate
corrugate; disc of labellum with fleshy ridges combined by 2 or 3
lamella, apex slightly narrowed; column ca. 2 mm, upper part enlarged;
operculum shortly conical, front margin slightly notched.
Capsule ovoid, ca. 5 mm in diam., with 3 ribs. Fl. Sep-Oct, fr.??

Tree trunks in broad-leaved forests; 1600--1900 m. S to SW Yunnan
[Myanmar, Thailand].
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Just to give the right name

Giulio


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