"P van Rijckevorsel" wrote in message
...
mel turner schreef

As so it will probably stay [being traditionally a member of Acacia
subgenus Acacia, it's thus part of a group that will remain "true
Acacias" by definition, i.e., the group containing the type species of
the genus]. If anything is to stay a member of the genus Acacia, it
will be they.

***
No
* * *

"No"?

Care to elaborate and clarify?
No, _Acacia farnesiana_ wasn't classified as a member of _Acacia_
subgenus _Acacia_, or no, the group containing the type species of
_Acacia_ won't be the group that must be considered _Acacia, s.s._
in any revised classifications?

With regard to your earlier suggestion that the bipinnate New Mexico
species may belong to the genus Acaciella, well, yes and no.

Maslin, et al. [2003] indicate that the genus_Acaciella_ is based on
_Acacia_ subg. _Aculeiferum_ sect. _Filicinae_. This is reportedly a
largely Mexican group, but other Acacia s.l. groups do occur in the
New World, including the SW USA:

TITLE: Geographical patterns in neotropical Acacia (Leguminosae:
Mimosoideae).
AUTHOR, EDITOR, INVENTOR: Rico-Arce,-Lourdes [Author,-Reprint-Author]
SOURCE: Australian-Systematic-Botany. 2003; 16(1): 41-48
ABSTRACT: Native neotropical species of Acacia, totalling 230 species,
are represented by two subgenera, Acacia and Aculeiferum. The number
of taxa per country and their distribution are presented. For subgenus
Aculeiferum, the species of section Filicinae are the richest in
Mexico, while species of section Monacanthea are the most diverse in
Brazil, Bolivia and Mexico. The species of subgenus Acacia have three
main areas of diversity, with Mesoamerica being the most important
region for the myrmecophyllous species and Mexico, the United States
and Cuba for the non-myrmecophyllous species.

So, the famous tropical American "ant-acacias" are in _Acacia_
subg. _Acacia_.

Other papers [cited in an earlier post] indicated that _A. farnesiana_
was in subgenus _Acacia_, and not in subg. _Aculeiferum_ sect.
_Filicinae_ [= Acaciella]. In fact, Bukhari, et al. [1999] said that
their DNA study showed that _A. farnesiana_ is the sister species to
_Acacia nilotica_ [the type species of the genus _Acacia_].

[snip]
cheers