AsTKR. COMPOSITiE. lit 



* Heads Qnrge) corymbose or racemose ; scales of the involucre imhricaled in several 

 series, rigid, u-ith herbaccovs or foliaccovs sumviits, somewhat squarrose or spread- 

 ing ; the inTwrmost usually Tncmbranaceous : achenia broad, cmiipressed, pubescent or 

 hairy. — Amelli. 



12. A. integrifolius (Nutt.) : stem simple, villous-pubescent, the summit 

 and the simple corymb glandular and viscid; leaves oblong-lanceolate, acute, 

 entire, 1-nerved, veiny; tlie radical and lowest cauline tapering into a mar- 

 gined petiole, almost glabrous; the others clasping, somewhat pubescent or 

 glandular; heads few (3-5); scales of the involucre loosely imbricated in 

 2-3 series, lanceolate, acute, glandular, herbaceous, somewhat unequal ; 

 achenia minutely silky-hirsute. — Nutt. ! in trans. Amer. phil. soc. (n. scr.) 

 7.]). 291. 



Rocky Mountains in lat. 42°, growing at a lower elevation than A. andi- 

 nus or A. glacialis, Nuttall ! — Plant 0-12 inches high, stout. Heads nearly 

 the size of A. Amellus; to which this species more closely approaches than 

 to any other. Leaves rather coriaceous, with a strong midrib (not tripli- 

 nerved) ; the numerous reticulated veinlets somewhat conspicuous on both 

 surfaces of the older leaves; the radical 3-5 inches long, including the peti- 

 ole. Exterior scales of the involucre broadl}' lanceolate, entirely herbaceous, 

 the margins not membranaceous; the innermost narrower, but similar, mem- 

 branaceous at the base. Rays "bluish-purple, 15-25" [Nutt.), rather large. 

 Pappus of unequal slightly rigid strongly scabrous bristles. Appendages of 

 the style linear-lanceolate, hirsute. 



13. A. spatliulatus (Lindl.) : stems low, bearing a few simple racemose 

 branches; leaves narrowly spatulate, obtuse, entire, somewhat nerved, nearly 

 glabrous; the uppermost lanceolate, dilated at the base and partly clasping, 

 often acute ; peduncles simple, nearly naked, tomentose-piibescent ; scales 

 of the involucre linear or oblong-linear, acute, pubescent, rather unequal, in 

 2-3 series, erect, with foliaceous somewhat spreading summits. — Lindl. ! in 

 Hook. fl. Bar. -Am. 2. p. 8, S^-in DC. prodr. 5. p. 231. 



Arctic America, at Bear Lake and Fort Franklin on the Mackenzie River, 

 Richardson I — Plant 5-10 inches high, slightly pubescent with appressed 

 hairs. Radical and lower leaves 2 to 3 inches long, 3-4 lines wide, of uni- 

 form appearance on both sides, often nearly linear; the lateral nerves some- 

 what reticulated. Heads few, about as large as in A. Amellus. Achenia 

 hairy, compressed. 



14. A. adscendens (Lindl.): stems low ascending; the branches simply 

 racemose or somewhat corymbose ; radical and lower leaves oblong-linear or 

 narrowly spatulate, glabrous, entire, with ciliate-scabrous margins ; the cau- 

 line linear-lanceolate, partly clasping; scales of the hemispherical involucre 

 numerous, closely imbricated, unequal, nearly glabrous ; the exterior linear- 

 oblong, obtuse, the innermost acute ; achenia minutely hairy. — Lindl. ! in 

 Hook. fl. Bor.-Am. 2. p. 8, S^-in DC. jnodr. 5. p. 231. 



j8. denudatus : leaves more strongly ciliate-scabrous ; the radical and low- 

 ermost somewhat fringed towards the base; the cauline small. — A. denuda- 

 tus, Nutt. ! in trans. Amer. phil. soc. {n. ser.) 7. p. 292. 



y. ciliatifolius : stem not denuded and scapiform, pubescent above ; leaves 

 more proportionate, distinctly ciliated ; scales of the involucre ciliate, some- 

 what acute. — A. denudatus /i. ciliatifolius, Nutt. I. c. 



Banks of the Saskatchawan towards the Rocky Mountains, Drummond ! 

 (3. & y. Arid and dry grassy plains in the Rocky Mountains near Lewis 

 River, about lat. 42°, Nuttall ! — Rhizoma creeping. Stems 8 to 16 inches 

 high, bearing several racemose or somewhat paniculate-corymbose heads, 

 which are smaller than in A. Amellus. Leaves rigid, the lowermost 2-4 inch- 

 es long, slightly veined when old, tapering into a margined petiole, which is 



