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



1. B. pauciradiata Harv. & Gray, PI. Fendl. 105 (1849). 

 Freely branching, 1 to 5 dm. high from a perennial root (but 



flowering the first year) , leafy, clothed throughout with a white 

 and floccose woolly tomentum : lower leaves oblong or spatulate. 

 few-toothed or -lobed, the longest over 7 cm. long; upper leaves 

 shorter, oblong or lanceolate to linear, closely sessile: involucre 



5 mm. high: rays roundish-oval, 5 to 10 mm. long, the nerves 

 conspicuous: achenes muriculate on the nerves, obscurely resin- 

 ous-atomiferous. 



Rather common in sandy soil of the Lower Sonoran Zone from 

 Palm Springs, Colorado Desert, and Ash Hill, Mohave Desert, 

 east into Arizona. 



2. B. multiradiata pleniradiata (Harv. & Gray) Coville, 

 Contr. U. S. Nat. Herb. iv. 133 (1893). B. pleniradiata Harv. 



6 Gray, PL Fendl. 105 (1849). B. multiradiata Gray, Syn. Fl. 

 i. pt. 2, 318 (1884) ; not B. multiradiata Harv. & Gray, in Emory 

 Kept. 144 (1848). 



Annual or perennial, usually taller than B. pauciradiata; 

 herbage similarly white-woolly but the pubescence more ap- 

 pressed: branches chiefly basal, ascending or erect: lower leaves 

 variously cleft into short obtuse lobes, narrowed to a wing- 

 margined petiole; upper leaves small, mainly entire and sessile: 

 heads on slender often much elongated peduncles : involucre hem- 

 ispheric ; its bracts narrowly oblong, acute : rays 8 to 12 mm. long, 

 oblong or at length broader, narrowed below, 3-toothed at the 

 truncate apex : disk-flowers numerous : achenes as in B. pauci- 

 radiata. 



In loose or sandy soil of the Lower Sonoran Zone from Rabbit 

 Springs and Ludlow, on the Mohave Desert, and Paloverde, Colo- 

 rado Desert, to New Mexico and Lower California. Also in 

 southwestern Inyo Co. The original B. multiradiata is the form 

 with long naked peduncles and large heads, not known from 

 California (=var. nudicaulis, of Syn. Fl.) 



63. PERITYLE Benth. 



Annual or biennial herbs. Herbage glabrous or viscid-pubes- 

 cent, never white-woolly. Leaves petiolate, the upper alternate, 

 the lower often opposite. Heads numerous, on evident peduncles, 



