428 COMPOSIT^E. Steplianomeria. 



which are rather shorter tlian tlie minutely scabrous akeneR,_ naked below, and 

 sparmgly barbellate-plumose towards the summit. — HemipUlium Schottti, Gray, 

 in Bot. Mex. Bound. 105. 



On the Gila, Schott, therefore beyond the limits of California, but likely to occur on the 

 Colorado. 



2. S. pentachaeta, Eaton. A foot high, probably annual, excessively branched, 

 paniculate : lower leaves linear and sometimes runcinate-toothed ; upper reduced to 

 minute scaledike bracts : heatls 3 or 4 lines long, 5-flowered : involucre of about 5 

 principal scales : akenes oblongdinear, columnar, truncate at both ends, slightly 

 narrowed only at base, rugose-tuhercled between the angles : pappus of 5 slender 

 rigid bristles, longer than the akene, sparingly pectinate at the somewliat dilated 

 base, thence naked to the middle, above rather copiously plumose. — Bot. King 

 Exp! 199, t. 20. 



Tnickee and Humboldt Valleys, Nevada {Watson): probably reaching the borders of the State. 

 . Perhaps a form of the next, with a diminished number of bristles to the pappus. 



3. S. exigua, Xutt. A foot or two high, paniculately and diffusely much 

 branched from an annual root : radical and lower leaves linear or narrowly lanceo- 

 late, runcinate-pinnatifid or toothed ; the upper slender and mostly entire except at 

 the partly clasping base ; those of the branchlets reduced to minute and obtuse 

 bracts : heads 3 to 5 lines long, 3-9-flowered : akenes and pappus as in the preced- 

 ing, but the latter of more numerous bristles, " usually 3 from each angle of the 

 akene, and with their slightly dilated bases commonly united." — Eaton, 1. c. 198, 

 t. 20, fig. 6, 7. HemqMmm Bigelovii, Gray, 1. c. 



Near Fort Mohave {Cooper), to Sierra Co. {Lcmmon), and Carson City {Anderson, &c.) ; thence 

 through Nevada and New Mexico to the borders of Texas. 



§ 2. Heads mostly small: bristles of the papjms 12 to 25, slemler and j^lumose 



throughout : receptacle completely naked. — Stephanomeria proper. 

 * Involucre narroiv, 3 - %-floivered, most commonly b-flowered, its outer scales all 

 short and ccdycidate : branches striate, slender and naked; their leaves usually 

 reduced to small bracts: lower leaves linear; the radical ones generally runcinate- 

 pinnatifid. 



4. S. paniculata, Nutt. Stem erect from an annual root, IJ to 3 feet high, 

 with rather simple ascending virgate branches, along which the short-pedicelled 

 heads are commonly racemose-panicled : involucre 3 or 4 lines long : akenes more 

 or less rugose or tuberculate between the narrow ribs. — Eaton, 1. c. fig. 5. b. vir- 

 gata, Benth. Bot. Sulph. 32. 



Hills and T)lains ; common through the State and in Nevada. There are two forms as to the 

 akenes; one shorter and thicker, with narrowed base, and usually strong and numerous rugosities 

 between the distant ribs, as figured by Prof. Eaton in the Botany of King s exploration : this is 

 S. virgata, Benth., and is the common Californian form, with the heads disposed to be spicate- 

 racemose along the rather rigid virgate (sometimes somewhat pubescent) branches, /^e othei 

 fonn has narrower akenes, lil^ those of S. exigua, with slight distinct tubercles m place of the 

 strong ragosities ; and the heads are more panicled. Apparently these characters do not ah\ays 

 coincide or hold out. 



5 S. minor, Xutt. Low : stems paniculately and loosely much branched from 

 a perennial root, a span to a foot or more high ; the slender and somewhat rush-like 

 branches terminated by the heads : involucre 4 to 6 hues long : akenes with broad 

 and strong (at length minutely scabrous) ribs having narrow grooves between, 

 columnar or slightly narrowed at the summit. — >S. minor, heterophylla ^rnncinatn, 

 Nutt. 1. c. Prenanthes (?) tenuifolia, Torr. _ Lygodesmia minor, Hook. 11. i. -Uo, 

 t. 103. Janiesia pauciflora, Nees in Neu-wied, Trav. 



Drv plains, along the^astern slope of the Sierra Nevada {Bolander, Torrey) to Oregon and to 

 the eastern bLse of" the Rocky Mountains. A New Mexican form of the species has narrower, 

 almost smooth, and more tapering akenes. 



