COMPOSITiE. (C(>MIV)81TE FAMILY.) 221 



the very uppermost reduced to scales: involucre fully J iiicli long, 5 to 10 

 flowered: Hgules of equal length, shouy, rose-red. — Fl. ii. 485. Gravelly hills, 

 W. Wyoming and Utah. 



* * Panicalatelij branched annuals: papims white and so/). 

 3. L. rostrata, Gray. Stem erect, 1 to 3 feet hif,'h, striate, leafy, corym- 

 bose-paniculate : leaves narrowly linear, attenuate to both ends, entire, ob- 

 scurely 3-nerved ; cauline 3 to 7 inches long, barely 2 lines wide ; ujtpermost 

 slender-subulate: heads numerous, on scaly-bracteolate erect peduncles: invo- 

 lucre 8 to 9-flowered, of as many very narrowly linear bracts : rays small and 

 narrow, probably purplish : akenes slender-fusiform, distinctly attenuate at 

 summit, longer than the soft rather dull-white pa]jpus. — Troc. Am. Acad. i.\. 

 217. L.JHnrea,yaiV. rostrata, Gray. Plains, from the Saskatchewan to Wyo- 

 ming and Colorado. 



80. TROXIMON, Nutt. 



Acaulescent or nearly so; with a cluster of sessile or subsessile radical 

 leaves, and simple scapes bearing a head of yellow or rarely purple flowers. 

 Includes both Troxinion and Macrorhi/nchus of the Western Reports. 



§ 1. Akenes beak! ess, or tapering gradaalbj into a short and thickish beak, on 

 which the nerves or ribs of the bodij are prolonged to the apex: pappus some- 

 what rigid. — EuTROXiMON. 



1. T. cuspid atum, Pursh. Glaucescent, somewhat tomentose when 

 young, a span to a foot high : leaves enfire, elongated linear-lanceolate and up- 

 wardlji linear-attenuate, mostly ciliate : involucre about an inch high ; its bracts 

 in 2 or 3 series, all tapering to a slender acumination, glabrous: akenes becoming 

 3 or 4 lines long, rather shorter than the unequal pappus, beakless. — Prairies, 

 from the Dakotas to Wisconsin and W. Illinois. 



2. T. glaucum, Nutt. Usually a foot or two high, rather stout, pale or 

 glaucous, either glabrous or with loose pubescence : leaves linear to lanceolate, 

 from entire to sparingly/ dentate or sometimes laciniate, 4 to 12 inches long: in- 

 volucre commonly an inch high and many-tlowered ; its bracts lanceolate or 

 broader ; outer series shorter, ofteii pubescent or even villous : akenes ivith the 

 stout nerved beak 5 or 6 lines long, longer than the pappus. — Macrorhipichus 

 glaucus, Eaton. Grassy plains, Saskatchewan and the Dakotas to British 

 Columbia, and mountains of Utah and Colorado. 



Var. parviflorum, Gray. A small and slender form : leaves only 2 to fi 

 inches bjug: scape a span to a foot high: head smaller and narrower. — 

 Synopt. Fl. i. 437. T. parviflorum, Nutt. Plains of Nebraska and Wyomin;; 

 to the mountains of New Mexico. 



Var. laciniatum, Gray. Dwarf (a span or two high), with the small 

 heads of the preceding variety, varying to larger, glabrous or glabrate. when 

 young often cinereous-pubescent chroughout : rays sometimes purpb'sh exter- 

 nally or in fading : leaves mostly of lanceolate outline and laciniate-pinnatifid. 

 — Bot. Calif, i. 437. Moimtains of Colorado and New Mexico to California 



Var. dasycephalum, Torr. & Gray. Commonly robust, with large and 

 broad heads: the involucre inch broad as well as high, and from villous to 

 cinereous-pubescent, sometimes early glabrate : receptacle not rarely bearing 



