Pdasites. COMPOSITiE. 375 



most cuneate-linear : heads densely paniculate : involucre 5-8-flowered, its outer or accessory 

 tonientose-canescent bracts short and ovate. — Torr. & (iray, l.'c. ; Eaton, 1. c. — Plains and 

 also on tlie drier mountains, Montana to Colorado, Wasliington Territory, and eastern slope 

 of the Sierra Nevada, California, ininicnsely a])undant, tlie chai'actcristic Sage-brush or Sarje- 

 icood of the region. 



Var. angustifolia, Gu.w. Leaves all narro\v ; lower spatulatc-linear, barely 3-toothed 

 at the roundish summit ; upper entire and more linear, a line or less wide : heads small : 

 shrub 3 or 4 feet high, with foliage too like that of the following species, but involucre of 

 A. trldcntata. — Proc. Am. Acad. xix. 49. — Arid ])lains, S. Idaho and W. New Mexico to 

 the Mohave Desert and the soutliern borders of San Diego Co., California. 

 A. triflda, Nutt. 1. c. A foot or two high, sometimes lower, much branched : leaves 3-cleft 

 and 3-i>arted ; the lobes and the entire upper leaves nari'owly linear or slightly spatulate- 

 dilated : beads numerous in the contracted leafy panicle, or spicatcly disposed on its branches : 

 involucre 3-5-flowered, rarely G-9-fiowered, its outer or accessory bracts oblong to short-linear 

 or lanceolate. — Torr. & Cray, Fl. ii. 419 (excl. var.); Eaton, 1. c. — Plaius and valleys, 

 Wyoming and Utah to Washington Terr, and the Sierra Nevada, California. 



-H- -t-i- Heads somewhat larger and broader, glomerate-paniculate, 7-14-flowered: involucre short- 

 canipanulate; inner bracts more scarious: stems low, suffnuicose. 



= Pubescence looser, furfuraccous-tomentose : inner bracts of the involucre narrow. 



A. Bolanderi, Gray. A foot or two high : leaves all narrowly linear, half a line wide, 

 acutisb, entire, or some with one or two slender lobes : heads numerous, densely glomerate- 

 paniculate, 14-flowered, mostly equalled or surpassed by one or two linear-subulate herbaceous 

 accessory bracts. — Proc. Am. Acad. xix. .50. — A. trifida, in part, Gray, Bot. Calif, i. 405. — 

 Mono Pass, in the eastern part of the Sierra Nevada, California, Do/ander. 



= = Canescent pubescence minute and very close: bracts of the involuci'e broad. 



A. cana, Pursh. A foot or two high, freely branched, silvery-canesccnt : leaves lanceolate- 

 linear or narrower, somewhat tapering to both ends', an inch or two long, entire, rarely with 

 2 or 3 acute teeth or lobes ; margins not revolute : heads glomerate in a leafy contracted 

 panicle, 6-9-flowered, rarely .'i-flowered, usually with one or two linear subulate accessory 

 bracts. — Fl. ii. 521 ; Bess." in Hook. Fl. & DC. Prodr. vi. 105; Torr. & Gray, I. c. A. Co- 

 lumhiensis, Nutt. Trans. Am. Phil. Soc. 1. c. — Plains, Saskatchewan to Montana, Dakota, and 

 Colorado ; common only northward. 



A. Rotlirockii, Gray, a foot or less high, less canescent or cinereous: leaves (inch or 

 less long) from cuneate and obtusely 3-lobed at dilated summit to s])atnlate-lanccolate or the 

 upper linear, sometimes all entire: iieads (2 or 3 lines long), glomerate-paniculate, 9-12- 

 flowered : proper bracts of the involucre all ovate or oval, glabrate. — Bot. Calif, i. 618; 

 Pothrock in Wheeler Pep. 3G6, t. 13 ; Gray, Proc. Am. Acad. xix. 50. A. tr'tfda, Gray, 1. c. 

 405, in part. — California, in the eastern and southern part of the Sierra Nevada, Rothrock, 

 Bolandcr, &c., and S. Utah, Ward, Parrj. 



Tribe VIII. SENECIONIDE^E, p. 79. 



179. TUSSILAGO, Tourn. Coltsfoot. ( 7V ss/s iind ayo, allays cough.) 

 — Single species, indigenous to Europe and Asia, naturalized in N. America. 



T. F.\RFARA, L. Low perennial herb, cottony-tomentose ; w'ith extensively creeping root- 

 stocks, sending up in earliest spring a scape beset with alternate lanceolate bracts, and 

 terminated by a head of yellow flowers; later developing rounded- or angulatc-cordate irregu- 

 larly dentate leaves on long and stout radical petioles, glabrate in age. — Wet grounds, a 

 common weed in N. Atlantic States and Canada. (Nat. from Eu.) 



180. PETAStTES, Tourn. Buttek-Bur, Sweet Coltsfoot. (neVao-os, 

 a broad-brimmed hat, alluding to the large and broad leaves.) — Perennial herbs, 

 of the northern tempertite zone ; with thickish and mostly creeping rootstocks, 

 sending up scapiform and foliose-bracteate simple flowering stems, and ample 



