DICOTYLEDONOUS PLANTS 181 



M. ma'jor DC. Ray corollas, with a broad 3 or 4 toothed or 

 lobed ray, and bearing on the opposite side of the style a roundish, 

 toothed appendage. Leaves simple, partly clasping. Heads nearly 

 2 in. in diameter, very showy. Throughout western California, in 

 low ground. 



XXIX. CH^NAC'TIS 



Herbs with pinnately compound leaves, more or less wMte- 

 wooUy, and heads of yellow, white, or flesh-colored flowers 

 without rays ; the outer corollas often have an enlarged 

 border simulating a ray. Involucre with green, linear, erect 

 bracts, generally in a single row. Receptacle flat. Pajypus 

 of chaffy scales. Akenes slender. The heads are solitary, 

 or in loose clusters on peduncles. The species are not easily 

 distinguished. 



XXX. HELE'NIUM, Sneezeweed 



Annual or perennial herbs with alternate leaves, and heads 

 on peduncles terminating the branchlets. Bracts of the 

 involucre in 2 series, the external scales narrow, leaf-like, 

 spreading, and at length reflexed, the internal scales few and 

 chaffy. Receptacle globular. Paptpus of 5-12 thin, chaffy 

 scales. Eay flowers yellow, disk flowers often purplish. 



a. H. puber'ulum DC. Widely branched, the stems winged with 

 the decurrent leaves. Disk forming a round ball, ray flowers incon- 

 spicuous. This is common in wet places. 



h. H. Bolan'deri Gray. Perennial, with stems a foot or two 

 high. Heads on long, naked peduncles which are thickened at 

 top. Leaves obovate or lanceolate. Heads large, wdth wedge- 

 shaped rays an inch long; disk an inch across. From northern 

 California to Washington. 



c. H. Bigelo'vii Gray. Stems tall and simple. Leaves lanceolate 

 to oblong or linear, entire. Heads on long, slender peduncles, with 

 rays half an inch long and disk as broad, somew^hat depressed. 

 Common in wet places in the Sierra Nevada Mountains of California. 



Tribe 7. Anthemoi'de^. Similar to Helianthoidece, but 

 the involucre consists of papery bracts in regular rows, the 

 pappus is a short crown or wanting, and the receptacle rarely 

 has chaffy scales mixed with the flowers. 



