260 University of California Publications in Botany. [VOL. 3 



from near Los Angeles also seem to belong here, as do others 

 from Soledad Canon. 8. coronaria is the form in which the 

 pappus-bristles are deciduous above the paleaceous base, leaving 

 a crown of setose scales. The common form in southwestern San 

 Diego Co. is intricately branched, the twigs very slender, the 

 herbage conspicuously glandular, and the pappus that of the 

 8 coronaria form. It apparently grades into typical 8. exigua 

 as regards all of these characters. 



Var. pentachaeta (Eat.) Hall, comb. nov. 8. pentachaeta 

 Eat, Bot. King Exped. 199, t. 20, ff. 8, 9, 10 (1871). Ptiloria 

 pentachaeta Greene, Pitt. ii. 133 (1890). Stem less branched, the 

 branches ascending : herbage pale : pappus of only 5 or sometimes 

 7 bristles, all distinct to the base which is slightly dilated and 

 commonly with a few minute teeth, plumose only on the upper 

 half. San Felipe, San Diego Co., Parish; Pacoima, San Fer- 

 nando Valley, Barber, no. 184 (with secondary pappus of short 

 bristles) ; Watermans, Mohave Desert, Mrs. Curran; northward 

 into Inyo Co. ; eastward to Arizona and Nevada. Differs from 

 the species chiefly in the less plumose pappus-bristles and in the 

 number of these, but this latter character inconstant. 



S. SCHOTTII Gray, Bot. Calif, i. 427 (1876), has been found 

 only on the Gila Kiver, Arizona, but is to be expected along our 

 eastern borders. Similar to 8. exigua but pappus of 5 or 6 linear- 

 lanceolate and blunt rigid scales or scariously margined awns, 

 naked below and sparingly barbellate-plumose towards the sum- 

 mit ; achenes minutely scabrous between the smooth angles. 



S. ELATA Nutt., PL Gamb. 173 (1847), said to be a blue- 

 flowered plant with narrowly linear leaves, a resinous herbage, 

 and plumose white pappus, collected long ago at Santa Barbara, 

 has not been since seen. 



CHEATADELPHA WHEELERI Gray, Proc. Am. Acad. ix. 218 

 (1874) ; Rothrock, in Wheeler Kept. 182, t. 15 (1878). Similar 

 to Stephanomeria, with which it is probably congeneric: invo- 

 lucre of 5 principal bracts and some minute calyculate ones, about 

 12 mm. high : achenes short-linear, 5-angled, very smooth : pappus 

 or 5 rigid upwardly tapering awns which bear on each side to- 

 ward the base 3 to 7 rather shorter and slender rigid bristles. 



