THISTLE FAMILY 883 



1. A. conspicuus Lindl. Stem 4-6 dm. high, scabrous-puberulent ; leaves 

 1-1.5 cm. long, acute or short-acuminate, scabrous above, pubescent beneath; 

 inflorescence corymbiform; involucre broadly campanulate, 1 cm. high, 1-1.5 

 cm. broad; rays violet, 1 cm. long. A. MacDougaii Coult. & Fisch. Hillsides, 

 open woods: Sask. S.D. Wyo. Ore. B.C. Submont. Mont. Jl-S. 



2. A. integrifolius Nutt. Stem 2-4 dm. high, puberulent below, glandular 

 above; lower leaves 1-1.5 dm. long, tapering into a margined petiole, oblanceo- 

 late, entire; upper stem-leaves lanceolate, sessile, clasping; inflorescence racemi- 

 form; involucres hemispheric; bracts acute, often tinged with purple; ligules 1 

 cm. long, bluish purple. Open moist woods: Mont. Wyo. Calif. Wash. 

 Submont. Mont. Jl-S. 



3. A. amplexifolius Rydb. Stem stout, 3-4 dm. high; basal leaves ob- 

 lanceolate, about 1.5 dm. long, tapering into a short winged petiole, entire, gla- 

 brate.in age, ciliate on the margins; upper stem-leaves ovate or broadly lanceo- 

 late; inflorescence racemiform; involucres fully 1 cm. high; bracts sometimes more 

 or less leafy; ligules 1 cm. long, bluish purple. Hills: Mont. Wyo. Utah. 

 Mont. Au. 



4. A. pauciflorus Nutt. Stem 1.5-5 dm. high, branched; leaves somewhat 

 fleshy, entire, glabrous, the basal ones petioled, linear-oblanceolate, 3-10 cm. 

 long; inflorescence glandular-puberulent, flat-topped; heads few; involucres 7-8 

 mm. high; bracts in 2 or 3 series, linear-lanceolate, acute; rays blue or whitish, 

 5 mm. long. A. thermalis M. E.Jones. Erigeron paucipetalus Osterhout. Saline 

 soil: Sask. Tex. Ariz. Utah Alta. Plain Son. My-Au. 



5. A. Kingii D. C. Eat. Cespitose perennial, with a short woody rootstock 

 or caudex; stem glabrous below, glandular above; basal leaves petioled, 4-8 cm. 

 long, glabrous; blades spatulate or oblanceolate, entire; stem-leaves few and 

 oblanceolate;. involucres 1 cm. high and 12-15 mm. wide; bracts attenuate; ligules 

 white, 8-10 mm. long. High mountains: Utah. Submont. Mont. Jl-Au. 



6. A. major (Hook.) Porter. Perennial, with a horizontal rootstock; stem 

 510 dm. high; leaves 5-10 cm. long, lanceolate, acuminate or attenuate, thin, 

 entire or minutely denticulate; inflorescence flat-topped, peduncled; involucres 

 1 cm. high, 12-15 mm. broad; ligules fully 1 cm. long, bluish purple. A. unal- 

 aschkensis major Hook. Moist woods: w Ont. Ore. Alaska. Mont. Au-S. 



7. A. modestus Lindl. Stem 48 dm. high, often purplish; leaves lanceolate, 

 48 cm. long, glabrous or nearly so, distantly denticulate, acuminate, shining; 

 heads few, in a corymbiform inflorescence; involucre 1 cm. high, 12-15 mm. wide; 

 rays bluish purple, about 1 cm. long. Moist woods: Alta. Mont. Ida. Wash. 



-B.C. Mont. Jl-S. 



8. A. Sayianus Nutt. Stem 3-8 dm. high; leaves thin, lanceolate, 4-8 cm, 

 long, entire or distantly denticulate; heads few, in a flat-topped inflorescence; 

 involucres 1 cm. high and 10-15 mm. wide; rays bluish purple, nearly 1 cm. long. 

 Wet places: Alta. Mont, Ore. B.C. Mont. Jl-S. 



9. A. Novae-Angliae L. Stem 4-25 dm. high; leaves lanceolate or oblong. 

 3-12 cm. long, entire, acute, firm, hispidulous on both sides, hispidulous-ciliate 

 on the margins; inflorescence leafy, much branched, flat-topped; involucres 8-10 

 mm. high, about 15 mm. wide; rays reddish purple or rose-colored, nearly 1 cm. 

 long. Low ground : Que. S.C. Colo. Alta. Plain Submont. Au-O. 



10. A. campestris Nutt. Stem 2-4 dm. high, branched above or simple; 

 leaves sessile, oblong or linear, 2-3 cm. long or the lower linear-oblanceolate, 

 glandular-puberulent, or glabrate, obscurely triple-nerved; involucres 6-7 mm. 

 high, about 1 cm. broad; ligules 8 mm. long, light violet or purplish. A. An- 

 drewsii A. Nels. Valleys: Alta. Colo. Ore. B.C. Plain Mont. 



11. A. Kumleini Fries. Stem 2-5 dm. high, branched above, often yellow- 

 ish or straw-colored, scabrous-puberulent; leaves rigid, sessile, oblong, 2-3 cm. 

 long, those of the branches reduced and more spreading; involucres 6-7 mm. 

 high, 8-10 mm. wide; bracts in 3-4 series, imbricate, linear-oblanceolate, firm, 

 squarrose; ligules bluish violet, 7-8 mm. long. A. oblongifolius rigidulus A. Gray. 

 Plains: Wis. Mo. Tex. Colo. S.D. Plain. Au-O. 



