Descriptive Flora 



207 



Page 



(m) Stems smooth or nearly 



SO; 



(1) Rays 8, yellow , . . . . Thelesperma — 235 



(2) Rays 8, brown-purple at 



base i Coreopsis — 233-4 



(n) Stems hairy or rough. 



(1) Chaff of receptacle per- 

 manently investing the 



achenes Sclerocarpus — 229 



(2) Chaff of receptacle not 

 permanently investing 



the achenes Viguiera— 23a 



b. Flowers white. 



m. Shrub Eupatorium — 214' 



n. Vine . . Mikania — 215 



o. Plants neither vines nor shrubs Melampodium — 226 



b. Leaves alternate, 

 x. Leaves with 1 main vein at base, 

 a. Flowers yellow or greenish yellow, 

 m. Sap milky. 



r. Leaves all basal Taraxacum — 246: 



s. Leaves not all basal. 



(a) Flower stalks with gland- 

 tipped hairs just below the 

 the flower. 



(1) Stems coarse, hollow, leaves 



crisp Sonchos — 246 



(2) Stems not coarse, leaves not 



crisp . . Serinea — 24T 



(b) Flower stalks smooth, with- 

 out glands. 



(1) Flowers 1" or more across Sitilias — 244 



(2) Flowers about across Lactuca — 245 



n. Sap not milky. 



1. Blades entire or nearly so. 



r. Shrub Chrysactinia — 



s. Plants not shrubs. 



(m) Ray flowers present, 

 (a) Rays drooping. 

 (1) Flowers large, leaves 



conspicuously hairy Rudbeckia — 229 



