1907] Hall. Compositae of Southern California. 65 



or broader, arranged in spikes, racemes, or panicles. Involucral 

 bracts numerous, closely imbricated. Rays yellow, changing to 

 purple, or wanting. Disk-corollas yellow, changing to brownish- 

 purple. Style-appendages very slender, almost terete, minutely 

 pubescent but neither comose nor with a bearded tuft at sum- 

 mit. Achenes linear, 4 to 6-nerved. Pappus reddish. 



Herbage white-tomentose : tips of involucral bracts erect 1. H. cana. 



Herbage green: outer involucral bracts with spreading or recurved tips 



2. H. squarrosa. 



1. H. cana (Gray) Greene, Pitt. i. 29 (1887). H. detonsa & 

 serrata Greene, 1. c. Diplostephium canum Gray, Proc. Am. 

 Acad. xi. 75 (1876). Corethrogyne cana Greene, Bull. Calif. 

 Acad. i. 223 (1885). 



Large shrub ' ' of rather loose habit ' ' : herbage densely lanate- 

 tomentose, the tomentum sometimes deciduous from the foliage: 

 leaves obovate to oblanceolate, the larger ones sometimes 10 cm. 

 long by 3 cm. wide, entire to sharply serrate : inflorescence panic- 

 ulate: involucre campanulate, 12 mm. high; bracts erect, the 

 outer ones with thick tips : rays inconspicuous, yellow, turning 

 to purple (sometimes wanting?) : achenes canescent, prominently 

 nerved. 



Guadalupe, San Clemente, Santa Cruz, Santa Rosa, and prob- 

 ably other of the coast islands ; often in rocky, inaccessible places. 

 The characters originally assigned to //. detonsa and //. serrata 

 are far from constant. For example, specimens from the type 

 locality of H. cana exhibit both entire and sharply serrate leaves 

 on the same branchlet (Guadalupe Isl., Anthony, no. 257) ; while 

 the persistence of tomentum and thickness of leaves may be ex- 

 pected to vary with climatic changes. 



2. H. squarrosa (H. & A.) Greene, Eryth. ii. 112 (1891). 

 Haplopappus squarrosus H. & A., Bot. Beech. 146 (1833). 



Suffruticose at base, 6 to 10 dm. high, the erect stems some- 

 what branching and leafy: herbage finely pubescent and some- 

 what glutinous: leaves oblanceolate to obovate, obtuse but the 

 strong midrib usually ending in a sharp point, somewhat clasping 

 at the closely sessile brse, sharply serrate : heads racemose or 

 paniculate, often 2 or 3 together in a close cluster: involucre tur- 

 binate, 10 to 12 mm. high ; bracts imbricated in many series, the 



