364 COMPOSITE. 



* * Ray-flowers ivhile or purplisJi, or none. 



2. P. bellidiflora, Greene, Bull. Calif. Acad. i. 86 (1885). Sparingly 

 branching, tlie peduncles somewhat scapiform : involucre hemispherical, 

 many-flowered : rays 8 — 14, white or reddish ; achenes obloug-turbmate, 

 villous : pappus-bristles 5 or none. — Open hills and sterile slopes in 

 Marin and San Mateo counties ; not common. April, May. 



3. P, aphantochaeta, Greene, Bot. Gaz. viii. 256 (1883). Very slender, 

 only 2 — 3 in. high, usually simple and monocephalous : whole plant 

 purplish, the peduncle white-villous under the small head : outer series 

 of corollas rose-red, claviform-urceolate, i. e., widening upwards, the 

 throat abruptly contracted under the minute teeth : pappus of 3 — 5 

 short bristles or cusps, or obsolete. — Frequent on open hiJls in San 

 Mateo and Contra Costa counties, thence northward. April, May. 



4. P. alsinoides, Greene, Bull. Torr. Club. ix. 109 (1882). Dichoto- 

 mously branching, only 2 — 5 in. high : involucre turbinate, of 5 — 7 

 bracts and 3 — 7-flowered : rays : disk-corollas filiform, not deeply 

 cleft : achenes obovate-clavate ; pappus-bristles 3, very slender. — An 

 obscure hillside plant, but not rare in middle portions of the State. 



8, HETEROTHECA, Cassini. Tall hairy herbs, with alternate 

 leaves, and a terminal corymbose panicle of middle-sized heads. Invol- 

 ucres ovate ; their bracts closely imbricated in many series, without 

 spreading tips. Flowers yellow ; those of the ray pistillate, of the disk 

 perfect, the later with ovate or lanceolate style-appendages. Achenes 

 compressed, pubescent, those of the ray thin-triquetroiis with caducous 

 pappus or none ; pappus of disk achenes of an outer series of sparse 

 short bristles, and an inner, moi-e copious series of longer ones. 



1. H. graiidiflora, Nutt. Trans. Am. Phil. Soc vii. 315 (1840). 

 Annual or biennial, 3 — 6 ft. high, hirsute, the inflorescence viscid and 

 strong-scented by a coat of short gland-tipped hairs : cauline leaves oval 

 or oblong, coarsely toothed, partly vertical by a twist in the petiole, this 

 at base bearing 2 stipuliform lobes : involucre ^^ in. high : ray achenes 

 without pappus, those of the disk with but faint traces of the outer and 

 shorter bristles.— Frequent along railways in Contra Costa Co.; an immi- 

 grant from more southerly portions of the State, where it is common. 

 July— Dec. 



9. CHRYSOPSIS, EllioU. Perennials, leafy-stemmed and of rather 

 low growth. Leaves sessile, entire or nearly so. Heads middle-sized, 

 terminating corymbose or fastigiate branches. Involucres ovate or 

 broader, of narrow regularly imbricated bracts in several series. Style- 

 appendages linear-filiform to slender-subulate. Achenes compressed, 



