194 COMPOSITE. 



scattered in pairs (opposite), oblanceolate, obtusish, not even the scattered 

 reduced and linear upper ones acute: corymbose panicle ample: rays 

 narrow, ^ — %. in. long, yellow: achenes lunate-clavate, brown dotted 

 with black. — Mountain sides and summits; Tainalpais, Hamilton, Diablo, 

 etc. May, June. 



39. HEMIZOMA, DeCandolle. Very heterogeneous assemblage of 

 annuals, of which the typical species are only empirically separated from 

 Madia on account of the broader ray-achenes, which are but partly 

 enclosed by their bracts. But the ray-achenes in the second group are 

 rugose, and the flowers diurnal. Eeceptacle flat; chaff mostly as in Madia. 



* Habit, pubescence, and vespertine rays of Madia; ray-achenes 

 obovate-triangular, smooth, the terminal areola nearly cen- 

 tral; disk-achenes abortive, without pappus. 

 ■i—Corymbosely paniculate-branching. 



1. H. congresta, DO. Soft-hirsute but not lanate, 2 ft. high, the 

 inflorescence glandular: bracts of the involucre with lanceolate foliaceous 

 tips little surpassed by the white rays: margined bracts of the receptacle 

 lightly connate or distinct: achenes with conspicuous inflexed stipe. — 

 Marin Co., near Olema. 



2. H. citrina. Lowest leaves opposite, oblong-lanceolate, 3-nerved, 

 obtusish, glandular-pubescent, not lanate: heads at first few, in a simple 

 corymbose-panicle: flowers lemon-yellow: tips of involucral bracts short 

 and broad; bracts of receptacle joined into a cup: achenes with incon- 

 spicuous stipe. — Northern part of Marin Co., a vernal species, flower- 

 ing in April and May. 



3. H. luzulsefolia, DC. Lowest leaves opposite, narrowly linear- 

 lanceolate, acute or acuminate, silvery-canescent with a fine appressed 

 silky wool: inflorescence at length diffuse, very glandular and ill-scented: 

 rays white or pinkish: involucral bracts, achenes, etc., as in the last. 

 Var. lntescens, Greene. Flowers from rich cream-color to lemon- 

 yellow, the branches more slender; leaves narrower. — The type abundant 

 in fields and waste lands generally. The variety in Contra Costa Co., 

 near San Pablo, and in Marin, about San Rafael. June — Dec. 



-i— -t-Heads racemosely arranged along simple branches. 



4 H. Clevelandi, Greene. Lower leaves narrowly linear, 1-nerved, 

 silky-lanate as in the last; racemose or spicate flowering branches villoug 

 with long spreading hairs: fl. white: achenes nearly as in the last. — 

 Common from Marin and northern Napa Co. to Oregon. 



