Flora of North America species comparison

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Genistidium

brushpea
Habit Shrubs, armed.
Stems

erect to ascending or scandent, broomlike, thorn-tipped, young growth sericeous.
Leaves

alternate, unifoliolate or odd-pinnate;

stipules present, caducous or persistent, subspinescent;

petiolate;

leaflets 1 or 3, blade margins entire, surfaces usually sericeous, sometimes sparsely so.
Inflorescences

mostly solitary flowers, axillary, in distal unifoliolate leaves;

bracts present;

bracteoles absent.
Flowers

papilionaceous;

calyx zygomorphic, campanulate, lobes 5;

corolla yellowish;

stamens 10, diadelphous;

anthers basifixed;

style glabrous basally, with pollen brush uniform in distal 1/2;

stigma terminal, capitate, ciliate.
Fruits

legumes, sessile, laterally compressed, linear, elastically dehiscent, sericeous.
Seeds

1–3(–6), lenticular;

hilum apical.
x

= 8.

Genistidium
Distribution
from USDA
n Mexico; Texas
[BONAP county map]
Discussion

Species 1.

Genistidium is native to the Chihuahuan Desert in western Texas and adjacent Mexico. It is readily distinguished from other woody native North American papilionoid genera by the combination of trifoliolate vegetative leaves and unifoliolate leaves on young branch ends that often harbor a solitary flower. The brushy or broomlike growth habit also is distinctive (M. Lavin and M. Sousa S. 1995).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11. Author: Matt Lavin.
Parent taxa Fabaceae > subfam. Faboideae
Subordinate taxa
G. dumosum
Name authority I. M. Johnston: J. Arnold Arbor. 22: 113. (1941)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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