MILKWEED FAIMILY 673 



ronate at the apex, subcordate or truncate at the base, 5-10 cm. long, tomentose; 

 lorolla-lobes oval-oblong, greenish white; hoods oblong, truncate, with a tri- 

 angular tooth on each margin; follicles puberulent, 5-iO cm. long. In sandy 

 soil: Neb. — Tex. — Colo.; n Mex. So7i. — Plain. Je-S. 



7. A. erosa Torr. Stem 5-10 dm. high, puberulent when young; leaves 

 canesccnt with white wool when young, glabrate in age, sessile, ovate or ovate- 

 lanceolate, 10-15 cm. long, thick, rounded or subcordate at the base; corolla- 

 lobes oval, 6-7 mm. long, greenish white; column fully 1 mm. long; hoods yellow- 

 ish, obovate, truncate; follicles about 7 cm. long, lance-ovoid, curved, canescent- 

 puberulent when young. River valleys: s Utah — Ariz. — Cahf.; Sonora. Son. 

 My-Jl. 



8. A. ovalifolia Dec. Stem simple, erect, 3-6 dm. high, finely tomentose; 

 leaf -blades oval, ovate, or ovate-lanceolate, 5-8 cm. long, acute at both ends, 

 finely tomentose or the upper surface glabrate in age; lobes of the corolla greenish 

 white or purplish, ovate-oblong, obtuse, about 5 mm. long; hoods orange or yellow, 

 oval-oblong, with a large tooth on each margin; follicles pubescent. Woods and 

 prairies: Man. — 111. — Neb. — Alta. Plain — Submont. Je-Jl. 



9. A. curvipes A. Nels. Stems usually several, ascending or erect, 4-8 dm. 

 liigh, obscurely puberulent, in age glabrous; leaves short-petioled; blades ovate- 

 lanceolate, rounded or acute at the base, minutely pubescent beneath, glabrate 

 above, 7-15 cm. long; corolla purple; its lobes ovate-elhptic, obtuse or emarginate, 

 6-7 mm. long; hoods yellowish, with purphsh middle, ovate, obtuse, round- 

 lobed on the sides; folhcles lanceolate, acuminate, 7-10 cm. long, densely white- 

 tomentose. Sandy banks: Wyo. Jl. 



10. A. Hallii A. Gray. Stem stout, 3-4 dm. high, finely puberulent; leaf- 

 blades lanceolate or ovate-lanceolate, acute at the apex, rounded or acute at the 

 base, 5-12 cm. long, puberulent or in age glabrate; corolla greenish, tinged with 

 purple; its lobes oblong, about 6 mm. long; hood oblong, hastately 2-gibbous at 

 the base, entire, obtuse; folhcles about 8 cm. long, lanceolate, tomentulose, in 

 age glabrate. Gravelly soU in the mountains: Colo. Submont. — Mont. Jl. 



11. A. brachystephana Engelm. Stems several, usually branched, ascend- 

 ing or spreading, 1.5-2.5 dm. high, minutely puberulent; leaf-blades narrowly 

 iinear-Ianceolate, long-attenuate, 5-8 cm. long, puberulent or in age glabrate; 

 coroUa greenish purple; its lobes about 4 mm. long, oblong, acute; colmun almost 

 none; hood ovate, obtuse, with large triangular lobes on the margins; folhcles 

 lance-ovoid, acmninate, 5-7 cm. long, tomentose. Dry soil: Kans. — Tex. — 

 Ariz. — Wyo.; n Mex. Son. Ap-Au. 



12. A. uncinalis Greene. Stems usually several, less than 1 dm. high, 

 puberulent; leaf-blades lanceolate to narrowly hnear-lanceolate, acuminate, 3-5 

 cm. long, sparingly puberulent or soon glabrate; corolla duh greenish purple; 

 column very short; hood orbicular, obtuse, with large triangular-ovate lobes. 

 Dry places: N.M. — Wyo. Submont. Ap. 



13. A. macrosperma Eastw. Stems several from a woody rootstock, de- 

 cumbent, 0.5-3 dm. high, tomentulose; leaves alternate; blades lanceolate or 

 ovate-lanceolate, acuminate at the apex, obtuse, trimcate or subcordate at the 

 base, 3-7 cm. long, glabrous or nearly so above, tomentulose beneath; corolla- 

 lobes 4-8 mm. long, purphsh beneath, greenish and puberulent above, membran- 

 ous-margined and notched; column short; hoods rounded at the summit; folhcles 

 6 cm. long, lance-ovate, acuminate, tomentulose. Sandy soil: se Utah. L. Son. 

 Au. 



14. A. labriformis M. E. Jones. Stems erect, glabrous; leaves all but the 

 lower alternate; blades glabrous, linear-lanceolate or lanceolate, 7-12 cm. long, 

 glabrous, acute at both ends; corolla-lobes oval, white, 5 mm. long; column 

 nearly 1 mm. long; hood oblong, truncate, greenish white; follicles glabrous, 

 ovate-oblong, acuminate, 3-4 cm. long. Sandy gulches: s Utah. L. Son. Jl. 



15. A. incarnata L. Stem glabrous or minutely puberulent, 6-20 dm. high, 

 very leafy; leaves opposite; leaf -blades 4-17 cm. long, oblong-lanceolate to linear- 

 lanceolate, acute to subcordate at the base; corolla deep rose-purple to pink or 



