166 COMPOSITE. (COMPOSITE family.) 



* * # Involucre less imbricated, hemispherical ; the bracts jjartly greenish, in few 



ranks, with or without scarious margins: low-stemmed or acaulescent, from a 

 thick rootstock, with solitary or few pedunculate heads, £ inch or more high: 

 leaves thickish and narrow. 

 *- I /"ids terminating short leafy stems which arise from creeping and woody 

 rootstocks : involucral bracts acuminate and tnucronate-tipped : akenes oblong, 

 very villous. 



31. A. Parryi, Gray. Tomentose-pubescent and cinereous, a span high: 

 leaves mostly spatulate and obtuse with a mucronate point, an inch or more 

 long: heads usually solitary on peduncle surpassing the leaves, very broad : bracts 

 of the involucre oblong-lanceolate, densely cinereous-pubescent : rays white, over 

 £ inch long. — Am. Nat. viii. 212. Mountains of Wyoming. 



32. A. Xylorrhiza, Torr. & Gray. Less pubescent and glabrate, 4 to 8 

 inches high : leaves from narrowly spatulate-lanceolate to linear, 1 or 2 inches 

 long, 1 to 3 lines wide; the upper commonly equedling the I to 3 peduncles: heads 

 smaller: involucral bracts more attenuate: rays "pale red " or " pale rose- 

 color," 4 lines long. — Mountains of Wyoming. 



•»- •»- Heads (large for the plant) solitary on simple and scapiform stems, which 

 with the cluster of narrow radical leaves rise from a thickened caudex: invo- 

 lucral bracts acutish : akenes linear, glabrate : pappus strongly denticulate. 



33. A. pulchellus, Eaton. Stems 2 to 4 inches long: radical leaves 

 from spatulate to narrowly linear. 1 to 2 inches long, obtuse, in our form only 

 a line wide : akenes striate. — Bot. King. Exp. 143. Alpine from Wyoming 

 and Montana to Oregon and Washington. 



* * * * Involucre little imbricated, with peduncles and upper part of stem viscid- 



glandular : heads £ inch high, with conspicuous violet or purple rays. 



34. A. paueiflorus, Xutt. Stem 6 to 20 inches high from a slender 

 creeping rootstock, simple and bearing few heads, or branching above: leaves 

 moderately fleshy, linear, or radical subspatulate or elongated-lanceolate, 

 uppermost reduced to bracts: bracts of short hemispherical involucre rather 

 fleshy and green, moderately unequal and rather loose, in only 2 or 3 ranks: 

 akenes narrow, compressed, striate-nerved, appressed-pubescent. — In saline 

 soil from New Mexico and Arizona to Utah, and eastward to the Dakotas 

 and Saskatchewan. 



§ 4. Involucre of 2 or 3 series of linear nearly equal bracts ; the outer fJ.iac.eous, 

 resembling the upper leaves: ray-flowers with the ligule generally 'wanting: 

 akenes narrow, not compressed, appressed-pubescent : pappus simpli . 

 soft. — COXYZOPSIS. 



35. A. angustus, Torr. & Gray. A span to a foot high, branching, 

 leafy-stemmed, nearly glabrous, except that the linear chiefly entire leaves 

 are somewhat ciliate : numerous rather small heads disposed to be racemose- 

 paniculate : bracts of the involucre acute : corolla of tbe ray-flowers reduced 

 to the tube and much shorter than tbe elongated style. — Fl. ii. 1(52. Wet 

 saline soil from Colorado and Utah to the Saskatchewan and Minnesota. 



§ 5. Involucre imbricated in many roics ; the bracts linear, coriaceous below, ivith 

 foliaceous spreading tips: rays numerous and conspicuous, violet or bluish 

 purple: akenes narrowed downward, compressed: receptacle honeycombed: 



