ONION FAMILY 159 



4. A. recurvatum Rydb. Bulb oblong-ovoid, 1-1.5 cm. thick; scape 

 slender, 3-5 dm. high, almost terete; leaf -blades 1-2 dm. long, 1-3 mm. wide, 

 thick; involucre 2-leaved, almost 2 cm. long; petals and sepals elliptic-ovate', 

 obtuse, 5 mm. long, rose, with darker midvein. A. cernuum obtusum Cockerell. 

 Dry hills and mountain-sides. Alta. S.D. N.M. B.C. Plain Mont. My- 

 Au. 



6. A. cernuum Roth. Bulb lance-ovoid, 1-2 cm. thick, often purplish; 

 scape 3-6 dm. high, stout; leaf -blades 1-2 dm. long, 3-7 mm. wide, rather thin; 

 involucre 2-leaved, rarely more than 1 cm. long; petals and sepals light pink or 

 white, with faint midrib, otherwise as in the preceding. On banks and hillsides: 

 N.Y. W.Va. Colo. Wash. Sask. Plain Submont. Je-Au. 



6. A. neomexicanum Rydb. Bulb oblong-ovoid, 1-2 cm. thick; coats 

 membranous, only the outer slightly fibrous; scape 3-4 dm. high, slender, terete; 

 leaf-blades narrow, 1-2 mm. wide, almost flat, slightly keeled; involucres very 

 small, scarcely more than 5 mm. long; petals and sepals oblong-ovate, nearly 

 white, with very faint midrib. Dry mountains: s Colo. N.M. Ariz. Sub- 

 mont. Au-O. 



7. A. fibrosum Rydb. Bulb ovoid, about 1.5 cm. thick; scape 2-3 dm. 

 high, striate, slender; leaf-blades flat, thick, 3 mm. wide, 1-1.5 dm. long; bracts 

 2, ovate, about 1 cm. long: petals and sepals lance-oblong, obtuse, 6 mm. long. A. 

 Geyeri M. E. Jones, not S. Wats. Mountain sides and meadows: Mont. Wyo. 

 Ida. (? B.C.) Submont. Mont. Je-Jl. 



8. A. rubrum Osterhout. Bulb ovoid, 1.5-2 cm. thick; scape 2-3 dm. 

 high, terete; leaf -blades 7 mm. wide or less, concave; involucre 3-leaved; petals 

 and sepals ovate, obtuse, 6-7 mm. long, with strong midrib; stamens and styles 

 equalling the petals. In pastures and meadows: Colo. s Wyo. Submont. 

 My-Jl. 



9. A. canadense L. Bulbs ovoid, 1-2 cm. thick; scape 2-6 dm. high, 

 stout; leaf -blades 1-5 dm. long, 3-8 mm. wide, rounded on the back; involucre 

 2- or 3-leaved; petals and sepals obtuse, pink or white, 4-6 mm. long; filaments 

 as long as the petals. In meadows and fields: Me. Fla. La. Colo. Minn. 

 Plain. My-Je. 



10. A. aridum Rydb. Bulbs ovoid, about 1 cm. thick, usually 2-4 together; 

 scape 1-1.5 dm. high, slender, striate; leaf -blades about 1-1.5 dm. long, often 

 equalling or surpassing the scape, about 2 mm. wide, channeled; bracts ovate, 



1 cm. long or less; sepals and petals about 6 mm. long, lance-ovate, acute; fila- 

 ments and style shorter than the petals. Dry hills in hard clay: Wyo. Plain. 

 Je-Jl. 



11. A. Nuttallii S. Wats. Bulb solitary, ovoid, about 1.5 cm. thick; scape 

 1-3 dm. high; leaves 2-3 mm. wide, 1-1.5 dm. long; bracts 1-1.5 cm. long; petals 

 and sepals ovate or ovate-lanceolate, acute or acuminate, rose or white, 4-6 mm. 

 long; stamens shorter than the petals. Plains and prairies: S.D. Kans.- Ariz. 

 Ida. Plain. My-Je. 



12. A. macropetalum Rydb. Bulb ovoid, solitary, about 2 cm. thick; 

 leaf -blades about 2 dm. long, almost equalling the scapes, 2-4 mm. wide; scapes 



2 dm. high or more, stout, 3-4 mm. thick; bracts about 2 cm. long; petals and 

 sepals lanceolate, long-attenuate, white, with a purple or pink midrib; capsule 

 with 6 conspicuous oblong crests. Mountains: Colo. N.M. Submont. Ap- 

 My. 



13. A. textile Nels. & Macb. Bulbs usually solitary, ovoid, 1-2 cm. thick; 

 scape slender, terete, 1-3 dm. high; leaf -blades '2-4 mm. wide, 1-1.5 dm. long; 

 bracts fully 1 cm. long; petals and sepals ovate-lanceolate, acute or acuminate, 

 4-6 mm. long; capsule with 6 small rounded crests. A. reticulatum Fraser, not 

 Presl. Plains and dry hills: Sask. N.M. Ariz .Alta. Plain Submont. 

 Ap-S. 



14. A. Geyeri S. Wats. Bulbs usually solitary, ovoid, 1.5-2.5 cm. thick; 

 scape 3-6 dm. high, rather stout; leaf-blades 2-4 mm. wide, 1-2 dm. long; bracts 

 1.5 cm. long or more; petals and sepals pink or white, ovate-lanceolate, acuminate, 



