106 University of California Publications in Botany. t v L - 3 



Near Glendale, Los Angeles Co., Braunton; near Santa Bar- 

 bara, ace. to Nuttall; Santa Catalina Island, Mrs. Trask; sand- 

 hills near Santa Maria, Santa Barbara Co., Miss Eastwood, no. 

 373 ; Arroyo Grande, San Luis Obispo Co., Brewer, no. 453 ; north 

 to Washington. 



31. EVAX. Gaertn. 



Low but rigid densely woolly annuals with small heads most- 

 ly surrounded by a circle of bract-like leaves. Receptacle nearly 

 flat (Diaperia) or columnar from a broad base (Hesperevax). 

 Pistillate fertile flowers numerous, each subtended by a plane 

 or slightly concave scarious oblong bract. Hermaphrodite- 

 sterile flowers few, central, subtended (in our species) by open 

 scarious bracts. Achenes smooth or minutely papillose, obcom- 

 pressed. Pappus none. 



Leaves narrowed to a slender petiole : receptacle columnar....!. E. sparsiflora. 

 Leaves closely sessile: receptacle nearly flat 2. E. multicaulis. 



1. E. sparsiflora (Gray) Jepson, Fl. W. Mid. Calif. 549 

 (1901). E. caulescens sparsiflora Gray, Syn. FL 1. pt. 2, 229 

 (1884). Hesperevax sparsiflora Greene, FL Fr. 402 (1897). 



Erect, 2 to 10 cm. high, the stems branching from the base 

 or rarely simple : leaves spatulate, narrowed to a very slender 

 petiole, the whole leaf 1 or 2 cm. long, 3 or 4 mm. wide in the 

 upper portion : heads solitary in the axils or slightly glomerate 

 at the ends of the branches: bracts of the oblong involucre (5 

 mm. high) and of the fertile flowers woolly externally and long- 

 hirsute at base, persistent and becoming coriaceous: receptacle 

 columnar: sterile staminate flowers usually 4 or 5; their bracts 

 roundish and tomentulose, whorled near the summit of the re- 

 ceptacle. 



San Diego, Cleveland, ace. to Gray; San Luis Obispo, 

 Brewer, no. 464; middle California. 



2. E. multicaulis DC., Prodr. v. 459 (1836). 



Diffusely branched from the base; the leafy ascending 

 branches sometimes 1.5 dm. long, bearing small terminal glom- 

 erules which are nearly hidden by the bract-like upper leaves: 

 leaves broadly spatulate, sessile by a broad base, .6 to 1.2 cm. long, 

 about 2 to 5 mm. wide : receptacle depressed-hemispheric : bracts 



