530 COMPOSITAE (COMPOSITE FAMILY) 



and offsets, soft-pubescent or sometimes nearly glabrous; stems slender, 

 mostly branched above, 3-9 dm. high: basal and lower leaves spatulate or 

 obovate, obtuse, dentate, 2-7 cm. long, narrowed into short petioles; upper 

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

 corymbose-paniculate, 10-25 mm. broad, slender-ped uncled; bracts linear, 

 usually scarious-margined : achenes puberulent. Through much of North 

 America; in fields and woods; rather rare in our range. 



36. Erigeron lapiluteus A. Nels. Biennial, with a strong vertical taproot; 

 generally only one stem from the enlarged crown, simple, stout, striate, erect, 

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

 the whitish hairs very straggling, obscurely granular: leaves numerous, 

 glabrate; crown leaves oblanceolate, petioles 3-6 cm. long; lower stem leaves 

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

 late, not much reduced; bracts small, linear: heads numerous, 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, largely concealed by copious pappus: achenes linear, less 

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

 yellowstonensis A. Nels. Bot. Gaz. 30: 198. 1900, a name to be rejected.) At 

 middle elevations, in open woods or burned over timber lands; Colorado to 

 Montana. 



37. Erigeron acris L. Sp. PL 863. 1753. More or less hirsute-pubescent; 

 stems 1-2 dm. high from a biennial or perennial root, the larger plants branch- 

 ing and bearing several or numerous somewhat paniculately disposed heads: 

 leaves pubescent or glabrate, entire; the radical and lower cauline spatulate, 

 mostly obtuse, 3-8 cm. long, petioled; the upper cauline mostly oblong or ob- 

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

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

 tubular pistillate flowers filiform, numerous: pappus simple or nearly so, 

 copious. Across the continent northward, and south in our mountains to 

 Colorado. 



37a. Erigeron acris debilis Gray, Syn. Fl. 1: 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. jucundus Greene, Pitt. 3: 165. 1897.) 

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

 probably does not occur in our range. 



38. Erigeron lonchpphyllus Hook. Fl. Bor. Am. 1: 18. 1834. Sparsely 

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

 rootstock, 1-3 dm. high, leafy: leaves hirsutely ciliate below the middle, 

 otherwise glabrous or glabrate, entire; the cauline linear or linear-lanceolate 

 (4-10 cm. long, 2-6 mm. wide), the lowest linear-spatulate or oblanceolate 

 and usually tapering into slender petioles: heads ped uncled 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. beyond the pappus: disk-flowers 

 filiform. (E. armeriaefolius Turcz. in DC. Prodr. 5: 291. 1836; E. racemosus 

 Nutt. Trans. Am. Phil. Soc. 7: 312. 1841.) Moist saline meadows in the 

 mountains of our range and in the Sierra Nevada, and far northward. 



28. WYOMINGIA A. Nels. WYOMING DAISY 



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

 caespitose, multicipital caudices whose branches are roughened or sheathed 

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

 1 or more from each crown, becoming naked and pedunculiform above. Leaves 

 crowded on the crowns and on the bases of the stems. Heads large ; involucral 

 bracts in 3-4 successively shorter rows, rigid with a thickened midrib. Flowers 



