COMPOSITE FAMILY 247 



7. CHRYSOTHAMNUS. 



1. C. nauseosus var. graveolens Piper. Rabbit-brush. A 

 white-woolly shrub, 2 to 5 ft. high. Leaves alternate, linear, 

 1-nerved, entire, Ya to 2 in. long, sessile. Heads numerous, 

 small, without rays, the narrow involucre of yellowish imbri- 

 cated bracts. Akenes cylindric, pubescent; pappus of soft 

 hairs, sordid. — A shrub of the desert borders, extending to 

 Yosemite Valley, Crane Creek, etc., in warm, sandy soil. 



C. viscidiflorus var tortifolius Hall, may reach our eastern 

 borders. It is a low, rounded shrub, not woolly, the heads in 

 rounded, terminal clusters, the numerous green leaves wavy- 

 twisted. 



C. bolanderi Greene, is a low, narrow-leaved shrub of the 

 eastern slope. Its stems are densely white-woolly, the nar- 

 row, discoid heads in short, leafy racemes, and the involucral 

 bracts drawn to very slender tips. 



8. HAZARDIA. 



1. H. whitneyi Greene. A perennial herb, 1 or 2 ft. high, 

 leafy to the top. Leaves harsh, alternate, oblong, rigidly 

 toothed, 1 or 2 in. long, closely sessile. Heads few, fully ^ 

 in. high, the involucre of acute overlapping bracts, the short 

 yellow rays and yellow disk both turning purplish. Akenes 

 glabrous; pappus reddish. — Almost throughout our district 

 but nowhere common. 



9. LESSINGIA. 



1. L. leptoclada Gray. A slender erect annual, 6 to 24 in. 

 high. Leaves woolly, alternate, narrowly oblong, the lower 

 ones tapering to the base, entire or few-toothed, V/2 in. or 

 less long. Heads lilac, scarcely y 2 in. long, mostly solitary on 

 nearly naked peduncles, the green-tipped bracts closely im- 

 bricated. Flowers nearly alike. Pappus of rough bristles, 

 becoming reddish. — Abundant in low valleys. The small form 

 with only 3 to 5 flowers in a head is var. microcephala Gray. 



10. CORETHROGYNE. 

 1. C. filaginifolia Nutt. Stems several, white-woolly, 1}4 

 to 3 ft. high, from a perennial base. Leaves densely woolly, 

 alternate, oblanceolate, obtuse, mostly entire, 1 to 2J^ in. long. 

 Heads V-z in. high, few, in a loose panicle, the erect bracts 

 closely imbricated. Rays purple; disk yellow. Akenes pu- 

 bescent; disk-pappus of rigid reddish bristles. — Rocky ledges 

 and walls below 5000 ft. alt., blooming late. 



