366 ASTERACEAE. 



linear or lanceolate, very acute, about 4 mm. wide, 3-nerved, serru- 

 late-scabrous, otherwise glabrous or slightly scabrous, twisted; 

 heads in fastigiate-cymose clusters, about 8 mm. high; involucral 

 bracts 3-4 in each row. 



This species is found in southern California only at high altitudes; 

 Mt. Pinos, Mt. San Antonio. 



3. C. occidentalis Greene. An erect branching shrub, 6-15 dm. 

 high, the flowering branches tomentose, becoming glabrate and 

 yellowish green; leaves narrowly linear, 15-40 mm. long, more or less 

 white-tomentose, sharply acute, 1 -nerved; heads numerous in 

 cymose clusters; involucres 8 mm. high; bracts 4 in each row, 

 cuspidate-acutish. 



A common species especially on the desert slopes of the moun- 

 tains, but chiefly in the lower edges of the coniferous forest belt; 

 Newhall; Geis. 



12. ISOCOMA Nutt. 



Rather rigid tufted erect suffrutescent plants, with 

 thick leaves and a corymbose terminal cluster of rather 

 small rayless heads. Involucral bracts coriaceous, 

 closely imbricated, the tips herbaceous, appressed. Co- 

 rollas permanently yellow; tube slender; limb ventricose, 

 its segments more or less connivent about the style. 

 Style-appendages ovate or somewhat narrower, pubes- 

 cent. Achenes short, compressed or subterete, silky- 

 pubescent. Pappus-bristles numerous, unequal, the 

 inner longest and often flattened and awn-like, faintly 

 scabrous. 



1. I. vernonioides Nutt. Glabrous or commonly loosely pubes- 

 cent, 6-12 dm. high, erect; leaves oblanceolate, more or less serrate, 

 2-4 cm. long, often with many fascicled ones in their axils; heads 

 8 mm. high, campanulate; bracts of the involucre obtusish; pappus- 

 bristles stout, none very perceptibly flattened. {Bigelovia veneta 

 Gray.) 



Common on dry hillsides and plains. Santa Monica; Los An- 

 geles; Santa Ana Mountains; San Joaquin Hills. July-November. 



13. HAZARDIA Greene. 



Low shrubs or suffrutescent plants, with subcoriaceous 

 more or less persistent toothed or serrate leaves, and 

 spicate or somewhat thyrsoidly congested heads. Invo- 

 lucre oblong or obconic, its numerous bracts in many 

 series, often with squarrose-spreading tips. Heads 20- 

 40-flowered. Rays yellow or none. Disk-corollas nar- 

 row, merely 5-toothed, yellow, changing to red or brown. 

 Style-tips linear-subulate. Achenes fusiform, slightly 

 compressed, few-nerved. Pappus reddish. 



