Astragalus distortus var. distortus

IllustratedEndemic
Treatment appears in FNA Volume 11.

Flowers (10.5–)11–15.5 mm; calyx tube 2.8–3.8 mm, lobes 1.2–1.9(–2.5) mm. Legumes 13–25 × 4–7 mm, sutures deeply sulcate, cross section didymous.


Phenology: Flowering late Mar–Jul.
Habitat: Prairies, open pine and oak woods, shale slopes.
Elevation: 40–400 m.

Distribution

Ark., Ill., Iowa, Kans., La., Md., Miss., Mo., Okla., Va., W.Va.

Discussion

D. Isely (1998) pointed out that the widely disjunct Appalachian populations of var. distortus doubtless have been isolated for some time. Its physiological differ­entiation perhaps exceeds that between the two varieties, which are not clearly defined. There are no morpho­logical differences between the Appalachian populations and those more western that justify formal taxonomic recognition.

Selected References

None.

Lower Taxa

None.
Stanley L. Welsh +
Torrey & A. Gray +
Batidophaca +
Ark. +, Ill. +, Iowa +, Kans. +, La. +, Md. +, Miss. +, Mo. +, Okla. +, Va. +  and W.Va. +
40–400 m. +
Prairies, open pine and oak woods, shale slopes. +
Flowering late Mar–Jul. +
Fl. N. Amer. +
Illustrated +  and Endemic +
Holcophacos distortus +
Astragalus distortus var. distortus +
Astragalus distortus +
variety +