ASTERACEAE. 367 



1. H. squarrosa (H. & A.) Greene. Suffrutescent, erect, 6-10 

 dm. high, glandular and glutinous; leaves oblong, about 2 cm. 

 long, spinulose-dentate; heads many, spicately thyrsoid toward the 

 summit of the branches, 1 cm. long; bracts of the involucre rigid, 

 appressed, in many series, their tips abruptly spreading; rays none; 

 achenes sparsely pubescent. (Aplopappus sqiiarrosiis H. & A.) 



Occasional on dry hillsides throughout our range. November. 



14. LESSINGIA Cham. 



More or less floccose-wooUy and sometimes glandular 

 annuals, with alternate more or less serrate leaves, and 

 small cymosely panlcled heads. Flowers yellow or often 

 whitish or purplish, all perfect. Corollas with slender 

 tube and long narrow lobes, the outer ones more deeply 

 cleft on one side and Imitating a palmatifid llgule. In- 

 volucre campanulate or turbinate, Its bracts much imbri- 

 cated, appressed, herbaceous tipped. Anthers with 

 slender subulate appendages. Style-appendages obtuse 

 or truncate, densely hispid, often with a setlform cusp 

 among the hairs. Achenes turbinate or cuneiform, 

 silky-villous. Pappus-bristles rigid, scabrous, red or 

 brownish. 



1. L. glandulifera Gray. Stems diffusely branched from a short 

 erect stem, 1.5-2.5 dm. long, glabrous or glabrate above; basal 

 leaves oblanceolate, pinnatifid, the lower stem leaves spinulose- 

 dentate, those of the branches 5 mm. long or less, thick and rigid, 

 ovate-lanceolate or oblong, the margins commonly beset with 

 yellowish tack-shaped glands; involucre campanulate or turbinate, 

 its bracts appressed, some or all glanduliferous; flowers yellow. 



Common on the dry interior plains of our region. June- Sep- 

 tember. 



15. CORETHROGYNE DC. 



Perennial herbs covered with a white woolly tomentum 

 at least when young. Inflorescence glandular. Leaves 

 alternate entire or serrate, heads middle-sized, solitary, 

 corymbose or panlcled. Involucre hemispheric to turbi- 

 nate, its bracts much imbricated, scarious except the 

 herbaceous tips. Receptacle pitted. Ray-flowers ster- 

 ile. Anthers appendaged at the apex. Style-appendages 

 comose or with a bearded tuft. 



1. C. virgata Benth. Stems erect, often 1 m. high; herbage 

 floccose- woolly; leaves narrowly obovate to oblanceolate, serrate- 

 toothed above; inflorescence a large virgate panicle, viscid with 

 short-stalked glands, usually bearing many heads; involucre turbi- 



