168 COMPOSITE. Toinisemlia. 



acuminate: iuvoliicral bracts linear-lanceolate, little unequal. — Proc. Am. Acad. xvi. 84. 

 T. strigosa, Gray, in Wilkes Exped. xvii. 344, not Nutt. Erigeron florifer. Hook. Fl. ii. 20. 

 Aplopappus florifer, Hook. & Arn. Bot. Beech. 351. Stenotus florifer, Torr. & Gray, Fl. 

 ii. 238. — Sandy banks of the Columbia River and its tributaries, east of the Cascades, Mon- 

 tana to Washington Terr, and Oregon ; first coll. by Douflas. 

 T. scapigera, Eaton. Low (2 to 4 inches high), hirsiitely pubescent : heads on scapiform 

 1-2-leaved stems : radical leaves spatulate (often broad and short, with a long narrowed base 

 or petiole) : involucral bracts rather broadly lanceolate. — Bot. King Exp. 145, t. 17. Aplo- 

 pappiis fljrifer, Ya,v., Hook. & Arn. Bot. Beech. 351 ? — Rocky ridges in the mountains, 

 Nevada and Modoc Co., N. E. California, Watson, Lemmon, Mrs. Austin. Flowering early : 

 a winter annual or l)iennial. 



Var. caulescens, Eatox, 1. c. A summer form, more slender and sparingly leafy- 

 stemmed, witli ratlier smaller heads. — Nevada, in Monitor Valley, Watson. 



Var. ambigua, Gray, 1. c. More leafy-stemmed from a slender root, fully a span 

 high : rays white : pap])us of the ray sometimes little more than half the length of that of 

 the disk. — Rabbit Valley, Utah, at 7,000 feet. Ward. 



•H- -H- Pappus of the ray setose-sqnamellate, shorter than the breadth of the akene. 



T. W^atsoni, Gray, 1. c. Somewhat cinereous with a close short pubescence : stems 4 to 7 

 inches high from a slender root, spreading, nearly all branching above and sparsely leafy, 

 therefore bearing numerous short-pedunculate heads : leaves narrowly spatulate and ob- 

 lanceolate : involucral bracts oblong-lanceolate : hairs of the akene rather shorter and obtuse 

 or at lengtli 2-3-dentate at tip. — T. strigosa, Eaton, Bot. King Exp. 145, uot Nutt. — Great 

 Salt Lake, Utah, on the shore of Staubury Island, June, Watson. 



-)— H— Hairs on the akene, or most of them, glochidiate-eapitellate, i. e. obtusely bidentate at apex, 

 and tlie apparently somewhat glandular lobes recurved or revolute, thus appearing to be 

 minutely depressed-capitate under a lens. 



++ Head large, three-fourths to a full incli long (without the rays) : plants green and glabrate, 

 depressed-acauk'scent from a perennial root, with habit of T. sericea : leaves large, nuich surpass- 

 ing the liead, minutely sericeous-pubescent when young, in age with t)nly some ciliate or other 

 hairs toward the attenuate petiole-like base, plane and coriaceous: involucre well imbricated. 



T. ^Tilcoxiana, Wood. Leaves linear-spatulate, elongated (1 to 3 inches long including 

 the petiole-like base) : head mostly solitaiw, sometimes an inch long, short-peduncled or 

 subsessile : bracts of the involucre lanceolate or the inner linear, barely acutish : ray and 

 disk-pappus of similar slender and elongated bristles. — Bull. Torr. Club, vi. 1G3, & Bot. 

 Gazette, iii. 50. — Colorado, in the San Luis Mountains, E. K. Smith. Indian Territory, 

 Dr. Wilcox. Patagonia Mountains, Arizona, Lemmon. 



T. Rothrockii, Gray'. Leaves more broadly spatulate and sliorter (inch or less long), 

 rosulate around the solitary head which is closely sessile at the surface of the ground, or at 

 length with one or two additional heads and tufts from the same crown : involucre shorter 

 and broader ; its bracts oblong, mostly obtuse : ray-pa]ipus of scjuamellate bristles not longer 

 than the breadth of the akene, or with one or two more elongated. — Rothrock, in Wheeler 

 Rep. vi. 148, t. 7; Proc. Am. Acad. xvi. 85. — Mountains of South Park, Colorado, in the 

 alpine district, at 13,500 feet, liothrork, J. D. Allen. 



++ ++ Heads from three fourths down to one third of an inch long, sessile, or rarely on a very 

 short naked peduncle: plants sericeous- or strigulo-^e-pubescont, depressed-acaulescent or low- 

 caulescent: involucre well imbricated: raj'-pappus mostly plurisetose. 



T. sericea, Hook. Depressed-acaulescent perennial, with closely sessile solitary or few 

 heads on the crown next the ground, surrounded and sur])assed or equalled by the linear or 

 linear-spatulate leaves, at length multicipital and pulvinate-tufted, an inch or two high : 

 head an inch or less long : involucral bracts narrowly lanceolate, mostly acute : rays white 

 or purplish-tinged: pappus of the ray plurisetose like that of the disk (forma piapposa, 

 Gray, PI. Fendl.), or of fewer but similar bristles, or (in the northern part of its range) with 

 most of the bristles short and aristiform, and even reduced to squamelhv litth^ longer than 

 the width of the akene. — Fl. ii. 16, t. 119; Torr. & Gray, Fl. ii. 185; Gray, PI. Fendl. 69; 

 Meehan.Nat. Flowers, ser. 2, i. t. 47 ; Gray, Proc. 1. c. 85. Aster? exsrapiis, Richards. Appx. 

 Frankl. Journ. 32. — On dry hills, plains, or mountains, Saskatchewan to Rocky Mountains 

 in lat. 54°, thence south to New Mexico and Arizona ; fl. April and May. — Varies from 



