168 KEY AND FLORA 



summit, with the teeth glandular on the outside. Pappus a 

 single row of feathery or rough bristles. Flowers white, 

 greenish or pinkish. 



B. Califor'nica Gray. Stems 2-3 ft. high, with wand-like branches, 

 usually growing in bunches. Leaves ovate, obtuse, crenate-dentate, 

 about an inch long. Heads in axillary clusters, together forming 

 an interrupted, erect panicle. Common through California, often 

 growing in the gravelly beds of streams. Blooming in the summer 

 and fall. 



Tribe 2. ASTEROI'DE^E. Anthers without tails. Style 

 branches of disk flowers flat, tipped with an appendage. 

 Leaves all alternate. 



n. GRINDE'LIA, Gum Plant 



Coarse, resinous herbs, with toothed leaves, large heads ivith 

 yellow rays and disk, in bud covered with a drop of milky-look- 

 ing resin. Scales of the broad involucre in several series, with 

 green, spreading tips. Akenes compressed. Pappus of a few 

 bristles that fall off easily. This is the most recommended 

 cure for the poisoning from Poison Oak. There are several 

 .species difficult to determine. 



m. 



Much-branched, slender-stemmed plants, with numerous 

 small rayless heads of yelloiv, purple, or white flowers on slender 

 peduncles, the corollas' of the outside flowers having the lobes 

 usually elongated and unequal. Involucre silky-hairy. Pappus 

 a single row of stiff rough bristles. They bloom in the sum- 

 mer, and the flowers deck the steins like small rosettes. 



a. L. Germano'rum Cham. YELLOW LESSINGIA. Low and 

 spreading, with heads of yellow flowers. Outer corollas with lobes 

 unequal. 



b. L. lepto'clada Gray. Stems from a few inches to 2 ft. high, 

 much branched, with numerous, very slender, smooth branchlets, termi- 

 nated by the heads of lilac or white flowers. Lobes of the corolla 

 equal, the tube as long as the pappus. This is widely spread and 

 very variable. The lower leaves are frequently dry when the plant 



