530 COMPOSITAE (COMPOSltE FAMILY) 



and offsets, soft-pubescent or sometimes nearly glai^rbiis; stems slender, 

 mostly branched above, 3-9 dm. high: basal and Iow6r leaves spitulatfe' or 

 obovate, obtiise, dentate, 2-7 cm. lon^, nari-owed into short petioles; Upper 

 stem leaves claisping and often cordate at the base: heads several or numerous, 

 corymbose-paniculate, 10-25 mm. broad, slender-peduncled','' bracts linear, 

 usually scarious-ttiargined: achenes puberiilent. — ^ThroiigTi much of North 

 America; in fields and woods; rather rare in our range. ' ' , ;'" 



38. Erigeron lapiluteus A. Nels. Biennial, with a strong Vertical taproot; 

 generally only one stein from the ^enlarged crown, simple, stout; striate, ertJt, 

 ' pattfculately branched as to the inflorescence, 3-6 dm. high, purplish, glabrate, 

 the whitish hairs 'very straggling, obscui-ely granular: leaves numerous, 

 glabrate; crown leaves oblanc'eblate, petioles 3-6 cm. long; lower Stem ISaV-es 

 similar but' with short-winged petioles; upper leaves sessile, narrowly lahCeo- 

 late, not much reduced; bracts small, linear: heads numerbus, on rather ^slen- 

 der peduncles; involucral bracts dark green, in 2 rows, subeqUal, very narrow, 

 acuminate, shorter than the 1 cm. high disk: flowers very numerous; rays 

 'filiform, purplish, Jargely concealed by copious pap{)Us: achenes linear, less 

 than 2 mm. long; the soft, dirty-^-white' pappus nearly '3 times as long. (B. 

 yeilowHotiensis A. Nels. Bot. Gaz. 30: 19S.'190O, a name to be I'ejected.) — At 

 middle elevatibns, in open w6ods or burned over timber lands ; Colorado 'ib 

 Montana. 



37. Erigeron' acrls L. Sp, PI. 863. 1753. More or less hirsute-pubescent; 

 'stems 1-2 dm; high from a biennial or perennial root, the larger plants braiicll- 

 ing and bearing' several or numerous sbmewhat paniculately disposed heads; 

 leaves pubescent or glabrate, entire ; the radical arid lower cauline spatillate, 

 mostly obtuse, 3-8 cm. long, petioled; the upper cauhne fliOstly oblong br ob- 

 lanceolate; obtuse or acutish, sessile: involucre hemispheric, the bracts linear, 

 hirsute: rays numerous, purple, equaling or exceeding the brownish pappus: 

 tubiilar pistillate .flowers filiform, numerous: pappus simple or nearly So, 

 copious. — Across the continent northward, and south in Olir fnouritalts to 

 ■Colorado. _.:,,-.',-, 



S7a. Erigerofl acris debilis Gray, Syn: Fl. i; 220: 1884. Sparsely pilose; 

 Stems 7-15 cm. high from an apparently perennial root, slender: leaves bright 

 green; the radical obovate or oblong; the cauline spatulate to lanceolate, short: 

 heads 1-3 in a' terminal cluster, 8-10 mm. high; bracts of the involucre sparsely 

 hirsute below, the smooth attenuate tips spreading: rays in flower rather 

 'Conspicuously surpassing the disk. {E.iricunchts Greene, Pitt. 3: 165l' 1897.) 

 — In the mountains of our range and northward. The variety Droebachensis 

 probably does not occur in' our range. ' ' '' 



38'. Erigeron Ibnchophyllus Hook; Fl. Bor.^ Am; 1 : 18.i 1834. Sparsely 

 more Or less hirsute with spreading bristly hairs; stems clustered on the small 

 rootstbck, 1-3 dm, high, leafy; leaves hirsutely ciliate below the middle, 

 otherwise glabrbus' or glabrate, entire; the cauline linear Or linear-lanceolate 

 (4-10 cm. long,' 2-6 mm. wide), the lowest' linear-spatujate of ioblanceolate 

 and usually tapering into slender petioles: 'heads peduneled and'^simple- 

 racemose, or rarely panicled; involucre 6-8 mm, 'long: rays- more numerous 

 than the disk-flowers, the' purplish or whitish nearly filiform ligules when 

 fully developed projecting only 1-2 mm. beyorid the pappus: disk-flowers 

 fiUform. (Ei armeriaefolius Turcz. in DG: Prodrt5;' 291. 1836; E. rdeemosua 

 Nutt. Trans. Am. Phil. Soc. 7: 312. 1841.) — ^Moist saUne meadows in the 

 mountains of our range and in the Sierra Nevada, amd far horthwafd.i , 



28. WYOMINGIA A. Nels. Wyoming Daisy 



Perennials with woody more or less branched roots and short, woody, 

 caespitose, multicipital caudices whose branches are roughened br sheathed 

 by the bases of the leaves of the previous years. Stems simple; monocephalous, 

 1 or more from each crown, becoming naked and (pedunculif orm above. Leaves 

 crowded on the crowns and on the bases of the sterns.^ Heads large j involucra 1 

 brdets in Z-i successively shorter rov/s, rigid with a thickened midrib; ■ Plowers 



