Rafinesguia. COMPOSITE. 429 



S. HYRIOCLADA, Eaton, 1. c. t. 20, of Northwestern Utah, is a more slender perennial species, 

 with smaller 3-flowered heads : and 



S. THURBERI, (;rav, I'l. Thurh., a larger-flowered annual or biennial of Arizona and New 

 Mexico. These arc the only recognized species, besides those here described. 



* * Involucre broader, about 10-floivered, and with some outer scales of intermediate 

 length : Stems leafy to the top ; the short juittine/es mostly naked. 



G. S. lactucina, Gray. Stems a span or two high from a perennial root, 

 coryrnbosely branched: leaves linear or- lanceolate, mncinate-denticulate or entire, 

 elongated : involucre halt' an inch long, of to 9 inner scales, a few looser calycu- 

 late ones, and one or two of intermediate length and character : akenes oblong- 

 linear, terete, very smooth, the ribs slender. — Proc. Am. Acad. vi. 552. 



Wooded region of the Sierra Nevada, at about 5,000 and 6,000 feet, in and near the Mariposa 

 Sequoia grove (Brewer, Bolander) ; also in the northern part of the State, at McComher's (Ni w- 

 berry), and pine woods of Mount Shasta, Brevier, Leaves 2 to 4 inches long, 2 tu i Hues wide. 

 Flowers delicate rose-color. 



§ 3. Heads larger, about 1 2-flowered : scales of the campanulate involucre more 

 numerous and imbricated in, about 3 series, the outer successiee/if shorter: 

 i ■ r, /'•/ /- a/i'eo/ate, and the man/ins tif the alveoli ji mbriolate-hirsute : bristli S of 

 the pappus 15 to 20, short-plumose for their whole length. — ALLOSERIS, Gray. 



7. S. cichoriacea, Gray. Minutely tomentose-puberulent when young, rigid : 

 stem 2 feet or more high, leafy below, and with virgate branches naked above : 

 leaves coriaceous, lanceolate, runcinately toothed, the teeth rigid: heads somewhat 

 racemose or panicled, short-peduncled : sales of the involucre rather loose and 

 rigid, lanceolate : young akenes short and smooth : pappus sordid or dull white. — 

 Proc. Am. Acad. vi. 552. 



Near Fort Tejon, Dr. Horn, Leaves 4 or 5 inches long (the lower unknown), not unlike those 

 of Cichory, but rigid. Involucre fully hill' an inch high. Corollas probably rose-color. An 

 ambiguous plant, both on account of the involucre, to which, however, the preceding species 

 leads up, and especially on account of the alveolate receptacle, the short-plumose pappus, and its 

 dull hue. 



Ch-etadelpjia Wheeleri, Gray, Proc. Am. Aead.ix.21S, discovered in Southern Nevada 



on the borders of Arizona, has been i mlv detected in X. \V. Nevada, b] I ind 



near the border of the State that it may I xpected within. The plant has the aspect of a Ste- 

 rn i-i'i. or of a Lygiulrsiiiiii : but the akeiii- of th.- live ilowers are severally partly enclosed 



in il annate base of the subtending scales of the involucre, and the pappus consists of five 



rigid awnlike naked scales, having a few shorter bristles adnate to their base, 8 to a on each side. 

 The root is perennial. 



111. RAFINESQUIA, Nutt. 



Head many- (15-30-) Glowered. Involucre conical-cylindraceous, of 7 to 15 

 equal linear acuminate principal scales, and a feu- loose and shorter calyculate ones. 

 Receptacle naked, flat. Akenes terete, slender, nbsi uivly ."i ribbed nr angled (nearly 

 smooth and glabrous, or the outermost pubescent), gradually attenuated into a slen- 

 der beak; the broad base hollowed at the insertion, bui destitute of a distinct callos- 

 ity. Pappus white or whitish, of 10 to 15 capillary bristles which are softly long- 

 plumose from the base to below the tip. — Leafy-stemmed and branching glabrous 

 annuals; with pinnatifid leaves partly clasping al base, and rather large beads 

 terminating the paniculate branches : corollas white or flesh-color. - Nutt. in Trans. 

 Am. Phil Soe. „. ser. vii. 129 ; Gray, I'l. Wright, ii. 103. 



A well-marked genus (although ioi 1 to St ia by Bentham), of two known species, 



both ' lalifornian, and o inclusively so. The a ken. ivnted at the broad insertion in the 



manner of ^ ind 1/ but wholly want the callous appendage. In the first species 



the Bowers are only transiently expanded according to Nuttall, and the appearance of all the 

 specimens conforms to this. But Dr. Bolander has found them open during the wholi 



