Sneezeweed Tribe 433 



and large solitary or scattered heads. Involucral bracts 

 thin, herbaceous, linear to oblong, in 2-3 series. Recep- 

 tacle flat. Ray-flowers yellow or purplish. Disk-flowers 

 with long narrow throat and 5 short lobes. Achenes 

 linear-clavate or cuneate-oblong, villous. Pappus of 

 4-5 hyaline palese, either erose or lacerate at the sum- 

 mit or dissected into capillary bristles. 



1. H. heterochroma Gray. Annual, stout, 6 dm. high or 

 more; leaves oblong, saliently dentate; involucre about 2 cm. 

 high, its bracts linear-lanceolate, attenuate-acute; ray-flowers 

 many, 6-8 mm. long, rose-purple, occasionally reduced or obso- 

 lete ; palese oblong, the 2 over the angles of the achenes longer 

 than the others, the shorter truncate-lacerate. 



Occasional in the San Gabriel Mountains in the upper portions of the 

 chaparral belt. Mount Lowe, Dudley; Wilson's Peak. 



55. HELENIUM L. SNEEZEWEED. 



Erect perennial resinous-dotted herbs, with alternate 

 leaves sessile except the lowest and often decurrent on 

 .the stem. Heads solitary or corymbose, borne on long 

 naked peduncles. Flowers yellow, those of the ray 

 several, usually small and drooping, those of the disk 

 numerous, minute, often brownish. Bracts of the invo- 

 lucre linear, reflexed. Receptacle globose or hemi- 

 spheric, naked. Achenes turbinate, ribbed, usually more 

 or less pubescent. Pappus of 5-12 thin or hyaline 

 palese. 



1. H. puberulum DC. Puberulent, paniculately branched, 

 6-12 dm. high, the branches ending in slender peduncles; leaves 

 lanceolate or narrowly linear or the longest oblong, sessile and 

 strongly decurrent on the stem ; heads globose, 10-15 mm. broad ; 

 ray-flowers and bracts of the involucre reflexed, short and incon- 

 spicuous; disk-flowers brownish; pappus-scales ovate, with a 

 short slender awn; achenes about 1 mm. long. 



Frequent along mountain streams, especially in the chaparral belt. 



