Flora of North America species comparison

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Brachystigma

desert foxglove
Habit Herbs, perennial; hemiparasitic, caudex woody.
Stems

erect, not fleshy, hirsutulous.
Leaves

cauline, in whorls of 3;

petiole absent;

blade not fleshy, not leathery, margins entire.
Inflorescences

terminal, racemes;

bracts present.
Pedicels

present;

bracteoles absent.
Flowers

sepals 5, calyx nearly radially symmetric, broadly campanulate, lobes deltate;

petals 5, corolla yellow, bilabiate, subrotate, abaxial lobes 3, adaxial 2;

stamens 4, didynamous, filaments glabrescent proximally, villous distally;

staminode 0;

ovary 2-locular, placentation axile;

stigma clavate.
Capsules

dehiscence loculicidal.
Seeds

100+, dark brown, ellipsoid, wings absent or present.

Brachystigma
Distribution
from USDA
sw United States; n Mexico
[BONAP county map]
Discussion

Species 1.

Brachystigma is monospecific and narrowly restricted to dry mountain slopes of southeastern Arizona, southwestern New Mexico, and northern Mexico. F. W. Pennell (1928) differentiated it from the similar genus Agalinis by its yellow corollas, glabrous anthers, capitate stigmas, more acute capsules, and winged seeds. Phylogenetic analysis of three chloroplast genes supports this distinction (M. C. Neel and M. P. Cummings 2004). Further, Brachystigma may be differentiated from closely related genera Aureolaria, Dasistoma, and Seymeria by its leaves arranged in whorls of three, a characteristic unique in Orobanchaceae.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 17, p. 559. Author: Christopher P. Randle.
Parent taxa Orobanchaceae
Subordinate taxa
B. wrightii
Name authority Pennell: Proc. Acad. Nat. Sci. Philadelphia 80: 432. (1928)
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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