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NORTH AMERICAN FLORA 



[Volume 24 



ochroleucous, or in one species crimson. Banner oblanceolate, often retuse at the apex, 

 moderately arched beyond the middle. Wings shorter, narrow, oblanceolate, with a reflexed 

 basal auricle, scarcely longer than the claw. Keel-petals shorter, the blade broadly lunate, 

 rounded at the apex, slightly auricled at the base, shorter than the long claw. Stamens dia- 

 delphous (9 and 1), the sheath with a broad base, straight to near the top. Ovary sessile; 

 style glabrous, straight to near the apex; stigma minute. Pod coriaceous or woody, one-celled, 

 sessile, straight or incurved, strigose or villous, ovoid, lance-ovoid, lance-oblong, or lunate, the 

 lower suture often slightly sulcate, but never producing a false partition. Seeds numerous. 

 Type species, Astragalus Shortianus Nutt. 



Pod strigose, short-pilose, or glabrous. 



Exocarp of the fruit not spongy; stem evident, but often short. 

 Pod more or less curved, or at least decidedly oblique. 



Leaves sparingly hairy or glabrous, scarcely canescent. 1. Iodanthi. 



Leaves densely silvery-canescent on both sides. 2. Cyanei. 



Pod straight or nearly so; leaves silvery. 3. MISSOURIENSES. 



Exocarp of the fruit spongy, at least in age; plant subacaulescent. 4. Pygmaei. 



Pod long-villous. 



Corolla purple or ochroleucous. 



Pubescence of the leaves strictly appressed. 5. Eriocarpi. 



Pubescence of the leaves loosely villous. 6. Glareosi. 



Corolla crimson. 7. CocciNEI. 



1. Iodanthi 



Calyx more or less black-hairy; pod more or less strigose; leaves strigose or 

 glabrous. 

 Leaflets glabrous or sparingly hairy on the margins and veins; pod 



mottled. 

 Leaflets strigose beneath; pod not mottled. 

 Pod 2.5-4 cm. long, long-acuminate. 

 Pod 2-2.5 cm. long, abruptly acute at each end. 

 Calyx white-hairy; pod glabrous; leaves, at least below, and calyx long- 

 pilose. 



2. Cyanei 



Pod tapering at the base, narrowly lanceolate-lunate, decidedly arcuate. 

 Leaves linear, obtuse; racemes elongate; calyx black -hairy. 

 Leaves oval or ovate to elliptic or lanceolate, if narrow, acute; racemes 

 mostly short. 

 Pod mottled. 2-3 cm. long; calyx more or less black -hairy, the teeth 



less than half as long as the tube; leaflets oval, acute. 

 Pod not mottled, 3-4 cm. long. 



Calyx-teeth less than half as long as the tube; leaflets obovate 

 or oval, obtuse or acutish; bracts 2-3 mm. long. 

 Leaflets oval, or elliptic, or narrowly obovate. 



Calyx white-hairy; pod forming nearly half a circle. 

 Calyx black-hairy; pod forming one fourth to one third 

 of a circle. 

 Leaflets broadly obovate. 

 Calyx more or less black-hairy, the teeth more than half as long 

 as the tube; leaflets lanceolate, very acute; pod about 8 mm. 

 wide, slightly arcuate; bracts 5-8 mm. long. 

 Pod rounded, obtuse, or merely acute at the base, obliquely lanceolate or 

 ovate, less arcuate. 

 Corolla white or ochroleucous; calyx with mixed black hairs; leaflets 



mostly oblong or elliptic. 

 Corolla usually purplish; calyx mostly white-hairy. 

 Leaflets elliptic to obovate; pod strictly strigose. 

 Calyx loosely pubescent. 



Pod pubescent; leaves pubescent on both sides. 



Pod 3^f cm. long, arcuate, sulcate on the lower suture; 



corolla more than 2 cm. long. 

 Pod 2-2.5 cm. long, slightly arcuate, not sulcate; corolla 

 less than 2 cm. long. 

 Pod glabrous; leaves often glabrate above, at least in age. 

 Calyx-lobes about half as long as the tube. 

 Calyx-lobes less than one fourth as long as the tube. 

 Calyx with strictly appressed hairs. 



Pod lance-ovoid, 2 cm. long or more. 

 Leaflets elliptic or elliptic-obovate. 



Calyx black-hairy; peduncles 3 dm. long; plant green. 

 Calyx white-hairy; peduncles 1-2 dm. long. 



Calyx-teeth about one third as long as the tube. 

 Calyx-teeth less than one fourth as long as the tube. 

 Leaflets broadly obovate. 



1 . X. iodanthus. 



2. X. cibarius. 



3. X. cuspidocarpus. 



12. X. iodopetalus. 



5. X. Zionis. 



6. X. amphioxys. 



7. X. melanocalyx. 

 17. X. Tidestromii. 



8. X. aragalloides. 



9. X. Webberi. 



10. X. Shortianus. 



11. X. pephragmenus. 



12. X. iodopetalus. 



13. X. remulcus. 



14. X. Chloridae. 



15. X. cyaneus. 



16. X. brachylobus. 



17. X. Tidestromii. 



