Psathyrotea. COMPOSITE. 377 



involucre 4 linjs high, nearly equalling the light yellow corollas. — Gray, Proc. Am. Acad. 

 ix. 206, & Bot. Calif, i. 409. — Cascade Mountains, on the border of Brit. Columbia, L;all. 

 . Yakima Co., Washington Terr., Brandegee. 



Var. Californica, Gray, 1. c. More densely woolly, and upper face of the leaves 

 tardily glabrate : corolla-lobes shorter. — W. California, on Chimney Kock, Mendocino Co. 

 (and, according to the ticket, behind Santa Cruz), Kellogg. 



183. PETJCEPH"£L,LUM, Gray, (Ucvkt,, the Fir, <j>v\\ov, leaf, from 

 some likeness in foliage.) — Bot. Mex. Bound. 74; Benth. & Hook. Gen. ii. 438. 

 Psathyrotes § Peucephyllum, Gray, Proc. Am. Acad. ix. 206. — Single species. 



P. Schottii, Gray, 1. c. Shrub 2 to 10 feet high, glabrous but resinous-viscid and balsamic, 

 very much branched, rigid (the stem at base often 3 inches in diameter, including the rougli 

 bark) : branches and branchlets very leafy up to the terminal heads : leaves alternate and 

 some fascicled in the axils, nearly terete, half-inch to inch long, as it were acerose but blunt- 

 ish and not very rigid, minutely impressed-punctate ; the lower sometimes 3-parted : heads 

 barely half-inch high : corollas dull yellowish, with the teeth becoming fuscous; anthers in- 

 cluded or half-exserted. — Psaihyrotes Schottii, Gray, Proc. Am. Acad. ix. 206, & Bot.' Calif. 

 i. 409. — Desert region of S. E. California and adjacent Arizona; first coll. by Schott and 

 Newberry ; later by Parry, Lemmon, Pringle, &c. 



184. PSATHYROTES, Gray. (* a 0i;p6Y7?s, brittleness, from the brittle 

 stems and branches.) — Low and pubescent or scurfy winter annuals (of Nevada 

 and Arizona) ; with round-cordate or ovate petioled leaves, and rather small heads 

 of yellowish flowers, sometimes turning purplish. — PI. Wright, ii. 100; Proc. 

 Am. Acad. vii. 363; also Proc. Am. Acad. ix. 206, & Bot. Calif, i. 409, excl. 

 § 2. Tetradymia § Polydymia, Torr. in Emory Rep. 1848, 145. Bulbostylis 

 (Psathyrotui), Nutt. PI. Gamb. in Jour. Acad. Philad. n. ser. i. 179. 



§ 1. Divaricately much branched, spreading or depressed, leafy; with solitary 

 heads in the forks, either erect or nodding on short or slender peduncles : corollas 

 more or less woolly at summit : style-branches glabrous, or with some very minute 

 pubescence at or toward the tip. 



P. ramosissima, Gray. Lanate, at least the stems and branches, and the young leaves 

 covered with dense and somewhat scurfy white tomentum : leaves long-petioled, roundish, 

 subcordate or almost cuneate at base, coarsely crenate (half-inch wide) : outer bracts of the 

 involucre 5, spatulate-oborate, much larger than the inner, the upper part spreading and 

 foliaceous : corollas plainly yellow : akenes short-turbinate, densely long-villous. — Proc. Am. 

 Acad. vii. 363, & Bot. Calif. 1. c. P. annua, Gray, PI. Thurb. 323, & Bot. Mex. Bound. 102, 

 in part. Tetradymia [Polydymia) ramosissima, Torr. in Emory Rep. I.e. — Gravelly hills 

 and rocks, along the Mohave and Gila, S. E. California and throughout adjacent Arizona ; 

 first coll. by Emory. 



P. annua, Gray. Furfuraceous-canescent or cinereous : leaves more dentate, seldom cor- 

 .date, commonly wider than long : outer bracts of the involucre ovate-oblong or narrower, 

 less foliaceous, rather shorter than the inner, erect : corollas more slender, pale yellow, 

 changing sometimes to purplish : akenes oblong-turbinate, densely villous : pappus rather 

 less copious. — PI. Wright, ii. 100, Proc. Am. Acad. vii. 364, & Bot. Calif. 1. c. Bulbostylis 

 (Psathyrotus) annua, Nutt. 1. c. — Saline plains, Nevada, eastern borders of California, 

 S. Utah, and adjacent Arizona; first coll. by Gamhcl. 



P. pilif era, Gray. Minutely furfuraceous-tomentose : leaves dilated rhombic-obbvate or 

 roundish with cuneate base, entire ; their margin and sometimes upper face and long petiole 

 beset with very long and soft (probably viscid) many-jointed hairs: heads narrower: outer 

 bracts of cylindraceous involucre oblong-linear, herbaceous only at summit : young akenes 

 oblong, short-hirsute : style-branches dorsally somewhat pubescent for some distance below 

 the truncate tip. — Proc. Am. Acad. xix. 50. — Southern Utah, near Kanab, Mrs. Thompson, 

 Parry. 



