COMPOSITE. (COMPOSITE FAMILY.) 165 



upper from linear to nearly filiform : bracts of the involucre in about 3 series, 

 lanceolate, acute or apiculate, thinnish, scarious-margined : rays purple or 

 violet, sometimes white. Bot. Gazette, ii. 70. Diplopappus ericoides, Torr. 

 & Gray. From Kansas and Texas to Utah, Arizona, and California. 



3. Pappus simple : bracts of the involucre imbricated and appressed, destitute 

 of foliaceous or herbaceous tips, often scarious-edged or more or less dry : rays 

 fertile: leaves mostly entire. ORTHOMERIS. 



* Involucre well imbricated, of small and narrow bracts, greener than in others of 



this section : low and slender herbs, leafy-stemmed, branching above ; with lin- 

 ear erect leaves, and several small white-rayed heads : akenes not compressed, 

 very glabrous. 



27. A. ptarmicoides, Torr. & Gray. Rather rigid, 6 to 20 inches high 

 in a tuft, from smooth to puberulent, bearing a corymbiform cyme of several 

 or numerous heads : leaves firm, linear or the lower spatulate-lanceolate : 

 bracts of the involucre oblong-lanceolate, obtuse, thickish, rather rigid : rays 

 2 to 4 lines long, broadish : pappus white, of rather rigid bristles, longer 

 ones manifestly clavellate at tip. From Colorado to the Saskatchewan and 

 New England. 



# * Involucre appressed-imbricated in several series of ovate or ovate-lanceolate 



dry chartaceous bracts: akenes compressed, more or less pubescent : stems leafy, 

 bearing several or solitary pedunculate heads. 



-i- Involucral bracts thin, acute, commonly tomentose (at least when young) : akenes 

 hirsute, becoming glabrate : heads showy, 4 to 6 lines high. 



28. A. Engelmanni, Gray. Rather tall and robust, green, puberulent to 

 glabrous: leaves thin, ovate-oblong to broadly lanceolate, 2 to 4 inches long, the 

 larger sometimes with a few small teeth, upper acuminate : heads inch high : 

 involucral bracts acute or acuminate ; some outer ones partly herbaceous, or with 

 loose pointed tips ; inner purplish : rays % inch long. Am. Jour. Sci. n. xxxiii. 

 238. A. elegans, var. Engelmanni, Eaton. Mountains of Colorado, Utah, and 

 Wyoming, to the Cascades. 



29. A. elegans, Torr. & Gray. Slender, 1 to 3 feet high, mostly scabro- 

 puberulent : leaves thickish, pale, lanceolate, inch or two long, erect, the upper 

 apiculate-mucronate : heads several at summit of simple stem or branches, 

 comparatively small and few-flowered, 4 or 5 lines high : involucral bracts all 

 close and conspicuously woolly-ciliate, barely acute, outer ovate, none with pointed 

 tips : rays rather few, about 4 lines long. Fl. ii. 159. Mountains of Wyoming 

 and Montana to Nevada and Oregon. 



t- -i- Involucral bracts firmer, glabrous, all the outer obtuse : akenes merely 

 pubescent : heads smaller, 3 lines high. 



30. A. glaUGUS, Torr. & Gray. Throughout smooth and glabrous, 

 glaucescent or pale : stems a foot high from extensively creeping filiform 

 rootstocks, branching, bearing several or numerous paniculate heads : leaves 

 thk'kish, lanceolate, 1 to 3 inches long, i to ^ inch broad, rather obtuse : invo- 

 lucre imbricated in about 3 ranks : rays bright violet, 4 to 6 lines long. Fl. 

 ii. 150. Mountains of Wyoming to Colorado and Utah. 



