Tephrosia thurberi
Tephrosia tenella
Thurber's hoary-pea
slender hoary-pea
erect, 30–60 cm, hirsute to hirsute-villous.
erect to decumbent or ascending, (8–)10–50(–100) cm, sparsely strigulose to glabrescent.
petiole 10–30(–40) mm;
leaflets (9–)11–27, blades elliptic to narrowly oblong, 15–30 × (5–)7–13 mm, length 2.5–3.5(–4) times width, apex obtuse to rounded, surfaces loosely strigose to sericeous.
petiole 10–30 mm;
leaflets (3 or)5–9(or 11), blades linear to linear-oblong, narrowly oblong, or oblong-elliptic, 15–40 × 2–6 mm, length 5–9 times width, apex acute to obtuse or rounded, abaxial surface sparsely strigulose, adaxial glabrous.
congested, 8–14-flowered, 2–4 cm;
floral bracts setaceous, caducous.
terminal and axillary, (1–)8–17-flowered, 10–30 cm;
floral bracts subpersistent, setaceous-subulate.
corolla pink and pink-purple or yellowish, aging pink-purple, 15–18 mm;
stamens weakly diadelphous;
style bearded.
corolla pink to rose-pink or rose-purple, aging darker reddish to purple, 6–9 mm;
stamens diadelphous;
style glabrous.
30–60 × 4 mm, villosulous.
30–50 × 3–4 mm, sparsely strigulose.
Tephrosia thurberi
Tephrosia tenella
Tephrosia thurberi is similar to T. virginiana but far disjunct and in a different biome. In the flora area, it is restricted to Cochise and Santa Cruz counties in southeastern Arizona.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
D. Isely (1998) noted that Tephrosia tenella seems a peripheral manifestation of the widespread T. purpurea complex. F. Shreve and I. L. Wiggins (1964) identified the species in the Sonoran Desert as T. purpurea (the type of which is from Africa) and observed that plants in the northern part of its range (called T. tenella) seem to have narrower, more acute leaflets but intergrade completely with ones at more southern localities.
Tephrosia vicioides Schlechtendal has been suggested to be the correct name for these plants (R. McVaugh 1987).
In Tephrosia tenella as identified here, most commonly the taproot becomes thick and distinctly perennial, and the plants often develop a woody, caudex-like region as well. Some plants arise from a slender taproot, with stems 8–30 cm and (1 or)2–5 flowers per raceme. Glabrous-styled taxa were not included in the study of Tephrosia by C. E. Wood Jr. (1949).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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