COMPOSITAE. 265 



Hemizonia pungens (H. & A.) T. & G. Hairy, but only slightly 

 glandular; stems 30-60 cm. high; basal leaves bipinnatifid, cauline simply 

 pinnatifid, the lobes lanceolate or linear-lanceolate, entire, very sharp-pointed; 

 the leaves on the branchlets entire, small and crowded, rigid, spine-tipped; 

 involucral bracts lanceolate, spine-tipped; receptacle convex; rays short, 

 narrow, toothed at the apex; pappus none. Introduced about Walla Walla 

 from California. 



398. LAGOPHYLLA. 



Annuals; stem slender, much-branched; leaves alternate or 

 opposite, mostly entire; heads small, few-flowered; ray -flowers 

 about 5, pistillate, fertile; disk-flowers as many, perfect but 

 sterile ; involucre of as many scales as the ray-flowers ; receptacle 

 small and flat; pappus none; ray-akenes obovate, much ob- 

 compressed, smooth, enclosed by the base of the involucral bract; 

 disk-akenes slender and abortive. 



Lagophylla rainosissima Nutt. Erect, loosely branched, 15-70 cm. high; 

 stems light colored, puberulent; leaves all but the lowest attenuate, entire, 

 linear-lanceolate or the lowest somewhat spatulate, 1-3 cm. long, all white 

 villous; heads 5-6 mm. long, in small clusters on the leafy branches; involucral- 

 bracts ciliate with long hairs, and usually with a few stalked glands on the 

 back; rays yellow, small; akenes 3 mm. long, club-shaped, with a ridge down 

 the inner face. Dry ground, common. 



399. ERICAMERIA. 



Low tufted half shrubs with linear leaves, which are punctate 

 and resinous; heads in corymbose panicles; involucral bracts 

 chartaceous, imbricated in several rows; flowers few, white or 

 cream-colored; pappus bristles unequal, slender, dull white or 

 yellowish. 



Ericameria nana Nutt. Forming much-branched depressed tufts 10-12 

 cm. high, 30 cm. or more broad; herbage glabrous but gummy; leaves small, 

 linear to narrowly spatulate, rigid, acute, 6-12 mm. long; heads corymbed 

 or rarely solitary; involucre turbinate, the bracts lanceolate, very acute, 

 chartaceous, a few outer ones passing into the leaves; flowers white or cream- 

 colored; ray-flowers 4-6, small; disk-flowers 8-12, their corollas deeply cleft; 

 styles setaceous, hispid. On rocks. Snake River canyon at the mouth of the 

 Tukanon and in the Blue Mountains. 



400. MACHAERANTHERA. 



Annual, biennial or perennial leafy-stemmed branched herbs; 

 leaves alternate, entire, serrate or pinnatifid; heads showy, 

 terminating the branches; involucre of imbricated canescent 

 bracts in numerous rows and with herbaceous or foliaceous 

 usually spreading or reflexed tips; ray-flowers numerous, violet 

 to red or purple, pistillate; disk-flowers perfect, yellow, changing 

 to red or brown ; pappus of numerous stiff rough unequal bristles ; 

 akenes narrowed below, pubescent. 



