CHICKWEED FAMILY 277 



sepals acuminate, about 3 mm. long; petals small, scarcely 2 mm. lone. Sandy 

 soil: Que.- Fla. Ore. B.C.; W. Ind.; nat. from Eu. My-S. 



2. A. cylindrocarpa Fernald. Stems ascending or spreading, 2-10 cm. 

 long, minutely puberulent; leaves ovate or oblong, 2-6 mm. long, acute; flowers 

 1-3; pedicels 4-10 mm. long; sepals ovate, 3-4 mm. long, about equalling the 

 petals. A. ciliata humifusa B. L. Robins., not Hornem. A. norvegica Am. 

 auth., not Gunner. Rich soil : Greenl. Que. Alta. B.C. Subalp.Alp. Je- 

 Au. 



3. A. polycaulos Rydb. Stems numerous, prostrate or spreading, about 

 1 dm. long; leaves ovate or ovate-lanceolate, spreading, about 5 mm. long; 

 sepals ovate-lanceolate, 3-4 mm. long; petals 5-6 mm. long, obovate, entire. 

 A. saxosa Coult., not A. Gray. Dry hills: N.M. Colo. Ariz. Mont. Je-Jl. 



4. A. confusa Rydb. Stems diffuse, slender, branched, 4-6 dm. long, finely 

 puberulent; leaves with a strong midrib, puberulent, 1-2 cm. long; sepals linear- 

 lanceolate, acuminate, about 3 mm. long; petals about three-fourths as long. 

 Sandy soil, especially in canons: Colo. N.M. Ariz. Submont. Subalp. Je-S. 



5. A. congesta Nutt. Stems somewhat woody at the base, glabrous, 1-3 

 dm. high; leaves filiform-subulate, 1-6 cm. long, strongly ascending or almost 

 erect; sepals carinate, obscurely 3-nerved, more or less scarious, 4 mm. long; 

 petals oblong, fully twice as long. Dry plains: Mont. Colo. Calif. Wash. 

 Plain Mont . Je- Au . 



6. A. cephaloidea Rydb. Stems strict, 2-4 dm. high, glabrous; leaves 

 erect, filiform-subulate, 3-10 cm. long; flowers in dense heads; bracts often 1 

 cm. long; sepals similar, but broader, 4-5 mm. long; petals oblong, about half 

 longer than the sepals. Hills: Wash. Ida. Submont. Je-S. 



8. A. nardifolia Ledeb. Stems decumbent at the base, otherwise erect, 

 1-3 dm. high; leaves filiform, 2-8 cm. long, those of the stem nearly erect; sepals 

 oval, obtuse, 4-5 mm. long, with scarious, often purple- tinged margins; petals 

 about twice as long. A. capillaris Am. auth. Grassy slopes: Alta. B.C. 

 Arctic Sea; Siberia. Submont. Subalp. Jl. 



9. A. lithophila Rydb. Stems erect, strict, 1-3 dm. high, glabrous; leaves 

 filiform, mostly erect, 2-5 cm. long; sepals oval, 3-4 mm. long, obtuse, scarious- 

 margined, sometimes tinged with brown or purple; petals 4-6 mm. long. A. 

 subcongestaHydb., in part, and var. lithophila. Hillsides and rocky ridges: Sask. 

 Wyo. Ida. Submont. Subalp. My-Jl. 



10. A. formosa Fischer. Stems somewhat woody at the base, erect, or de- 

 cumbent at the base, 1-2 dm. high; leaves filiform, mostly erect, 2-7 cm. long; 

 bracts lanceolate, more or less scarious-margined; sepals oval, obtuse, with 

 scarious or more or less colored margins; petals 6-9 mm. long. A. capillaris 

 Am. auth. Mountains and hills: Alta. Utah Calif. B.C. Submont 

 Mont. Je-Au. 



11. A. salmonensis Henderson. Stems more or less woody at the base, 

 6-10 cm. high; leaves filiform, 1-3 cm. long, glabrous or scabrous-ciliolate; 

 bracts scarious, ovate; sepals 2-3 mm. long, ovate, obtuse, scarious-margined. 

 Dry plains and ridges: Mont. Ida. Ore. Wash. Submont. Subalp. Jl- 

 Au. 



12. A. Kingii (S. Wats.) M. E. Jones. Stems somewhat woody and glabrous 

 below, glandular above; leaves subulate, ascending-spreading, 1-3 cm. long, 

 often scabrous-ciliolate; bracts ovate, scarious; sepals lanceolate, acute, about 

 4 mm. long, glandular-puberulent, scarious-margined; petals about 5 mm. long. 

 Mountains: Nev. Utah. Mont. Je-Jl. 



13. A. uintahensis A. Nels. Stems decumbent at the base, 1-2 dm. high, 

 glabrous below, glandular-puberulent above; leaves filiform, somewhat acerose, 

 1-3 cm. long; sepals ovate-lanceolate, acute, scarious-margined; petals oblong, 

 about 5 mm. long. Dry hills: Wyo. Calif. Ore. Submont. Je-Jl. 



14. A. compacta Coville. Densely tufted perennial, with woody caudex; 

 floral stems 2-10 cm. long, few-leaved; leaves mostly basal, densely clustered, 



