66 University of California Publications in Botany. [ VoL - 3 



acutish tips of at least the outer ones recurved or squarrose- 

 spreading : rays none : achenes glabrous or sparsely pubescent. 



Occasional in the chaparral belt (Upper Sonoran Zone), west 

 of the mountains, from San Diego and San Bernardino north- 

 ward to Monterey; also on the Santa Barbara Islands. Aug.- 

 Nov. Ace. to Mr. Parish the vernal leaves are 5 cm. long, thin, 

 deciduous before the flowering season, leaving the stems bare 

 below: later leaves (2 to 4 cm. long) coriaceous and glutinous in 

 plants of the interior; glutinous, somewhat pubescent, and less 

 rigid in coast plants. 



H. OBTUSA Greene, Fl. Fr. 375 (1897). Stouter than the last 

 preceding: heads in almost sessile glomerules along the stem or 

 simply spicate : involucre over 12 mm. high, its bracts almost 

 truncate but with a short cusp : achenes glabrous. Known only 

 from San Emigdio Canon, Kern Co., but to be expected along our 

 northern borders. 



H. ORCUTTII (Gray) Greene, Eryth. ii. 112 (1894), occurs in 

 Lower California, reaching nearly to our borders. It is much 

 like H. squarrosa in habit and involucres but is nearly glabrous, 

 has entire acute punctate leaves, and short yellow rays. 



H. BERBERIDIS (Gray) Greene, 1. c., likewise occurs just over 

 our southern border. It has oval obtuse spinulose leaves, half- 

 clasping at base, obtuse involucral bracts, and numerous showy 

 rays 6 to 12 mm. long. 



18. LESSINGIA Cham. 



Herbaceous plants with alternate leaves, branching stems, and 

 commonly scattered heads of yellow, purplish, or white flowers. 

 Heads rather small, campanulate to turbinate, 5 to 25-flowered. 

 Involucral bracts mostly with distinct green tips, imbricated in 

 several appressed ranks. Receptacle flat, alveolate. Flowers 

 perfect. Corollas with linear lobes, either all regular or some of 

 the outer ones enlarged and more deeply cleft on the inner side, 

 the ligule-like limb irregularly 5-lobed. Style-branches tipped 

 with a very short obtuse appendage which bears a more or less 

 conspicuous cusp or subulate prolongation among apical bristles. 

 Achenes all fertile, turbinate or cuneate, more or less flattened, 



