304 COMPOSITE EUTHAMIA 



S- Missourieiisis Kutt- Journ. Acad Philad. vii. 32. Pmooth and 

 glabrous : stems a foot or more high, simple or sometimes fastigiately 

 branched at the summit: leaves rigid, crowded, often fascicled in the upper 

 axils, linear-lanceolate, acute, -with very scabrous margins, the lower tap- 

 ering to the base, sharply and sparsely serrulate toward the apex: the 

 radical oblong-spatulate, petioled, a-5-nerved, reticulated, the iippermost 

 entire and scarcely if at all nerved: racemes rather dense, slender at length 

 recurved-spreading, forming a short and crowded pyramidal panicle: 

 bracts imbricated : rays 6-10, rather short, achenes slightly pubescent Dry 

 prairies, Idaho to the Assiniboine and the southeastern states. 



S. serotina Ait. Hort. Kew. iii. 211. Stems stout, 2-8 feet high very 

 smooth and glabrous up to or near the ample secund panicle: leaves 

 lanceolote or broader, 3-10 inches long, sharply and saliently serrate, 

 glabrous both sides: heads very numerous, crowded: rather large and full, 3 

 lines high : bracts of the involucre broadly linear-oblong or linear : , rays 

 7-14, conspicuous achenes more or less pubescent. In rich alluvial lands, 

 Oregon to British Columbia and eastward 



S. elongata Nutt. Trans. Am Phil. Soc. xii, 327. ^Sterns rather 

 slender, 2-4 feet high, smooth or minutely pubescent, strict: leaves lanceo- 

 late, acute or acuminate at both ends, spai'ingly serrate, nearly glabrous, 

 obscurely 3-nerved: panicle elongated, virgate or narrowly pyramidal, 6-10 

 inches long, the racemes at length somewhat spreading: bracts of the in- 

 volucre linear subulate: rays small and slender: achenes pubescent Com- 

 mon in dry grounds, British Columbia to California. 



S. Californica Nutt. 1. c. Stems rather stout, 2-4 feet high caoescent- 

 ly peberulent or pubescent : leaves oblong or the upper oblong-lauceolate 

 and the lower obovate, obtuse or apiculate, entire or the lower with some 

 small teeth, canescently puberuient or beneath more pubescent : panicle 

 virgaf, 4-13 inches long, dense, the racemiform clustern erect or_ barely 

 ■ spreading in age, when elongated mostly secund and even with the apex 

 at length recurved, heads 3-4 lines long: bracts of the involucre lanceolate 

 oblong or oblong-linear, mostly obtuse, externally somewhat nuberulent: 

 rays 7-12 fewer than the disk -flowers : achenes minutely pubescent Lny 

 grounds, southern Oregon to California, the borders of Nevada and 

 Mexico. 



12 EUTHAMIA Oass Diet, xxxvii, 471. 



Erect scabrous perennials with narrow alternate leaves and 

 numerous small heads of yellow flowers in terminal corj'mbose 

 panicles. Heads many-flowered, the ray flowers more numer- 

 ous than those of the disk, and never surpassing them in 

 height. Keceptacle fimbrillate or the alv oli pilose. .Achenes 

 villous- pubescent, short and turbinate. 



E. occldentalis Nutt Trans. Am. Phil. Soc vii, :««. Stems numer- 

 ous from extensively creeping rootstocks, 2-6 feet high, loosely branched, 

 the bran<;hes terminated by small clusters of mostly pedicellate heads: 

 leaves numerous, linear, entire, smooth, usu^lv 3-nerved, the margins ob- 

 scurely scabrous : bracts of the involucre linear-lanceolate, acute: rays 16- 

 20; disk flowers 8-14. alveoli of the re<-eptacle pilose. 



Subtrihe ii. Heterochromese Gray. Syn. F(. i p'. S 54. Rny 

 fl"W'r>s hl.ne red nr ■imriili lo white, rur ly iiellnw or wn'hHvg in cer 

 I "in snecies Dibk of hermnphodUe nnd mnstly fertile flniivs, their 



