304 COMPOSURE EUTHAMIA 



S. Missouriensis Nutt- Journ. Acad Philad. vii, 32. Smooth 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, 3-5-nerved, reticulated, the uppermost 

 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_1 4 f 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. Stems rather 

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

 late, acute or acuminate at both ends, sparingly serrate, nearly glabrous, 

 obscurely 3-nerved : panicle elongated, virgate or narrowly pyramidal, 6-l0 

 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 canescent- 

 ly peberufent or pubescent : leaves oblong or the upper oblong-lanceolate 

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

 small teeth, canescently puberulent or beneath more pubescent: panicle-, 

 virgat^, 4-12 inches long, dense, the racemiform clusters 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, nlostly obtuse, externally somewhat rmberulent: 

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

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

 Mexico. 



12 EUTHAMIA Cass Diet, xxxvii, 471.. 



Erect scabrous perennials with narrow alternate leaves and 

 numerous small heads of yellow flowers in terminal corymbose 

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

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

 height. Receptacle fimbrillate or the alv oli pilose. Achenes 

 villous pubescent, short and turbinate. 



E. OCCidentalis Nutt Trans. Am. Phil. Sx- vii. 326. Stems numer- 

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

 the brandies terminated by small clusters of mostly pedicellate heads: 

 leaves numerous, linear, entire, smooth, usually 3-nerved, the margins ob- 

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

 20; disk Mowers 8-14: alveoli of the receptacle pilose. 



Subtribe ii. Heterochromea Gray. Syn, Ft. i p'. % 54- ttay 

 flow r>i blue red or yjnr/*/« <o white r->r ly ■> ellnw or wa^Hvg in rer 

 tain soeriex Ditk of berwophodt'r ond w^dy fertile flnire*s. th?,ir 





