198 composite:. 



the heads subulate, but obtuse, commonly ending in a large saucer- 

 shaped gland. Receptacle small, flat, the chaff herbaceous and only 

 encircling the disk flowers. Rays 1 — 5, white or yellow, vespertine, 

 palmately 3-lobed or -parted; the head as a whole narrow and small. 

 Ray-achenes obovoid-triangular, the terminal areola nearly central. 

 Disk-achenes turbinate-quadrangular, the outer fertile, all bearing a 

 conspicuous chaffy pappus. 



1. C. truncata, DO. Slender, 1 — 2 ft. high, glabrous, or some of the 

 lower leaves sparsely hispid; herbage keenly benzine-scented, though 

 rigid and dry: heads sessile and scattered along the virgate branches: 

 short uppermost leaves and bracts truncate by a large sessile flattish 

 gland:/, yellow; rays 5 (rarely more); disk-fl. 10 — 24; receptacle-chaff 

 distinct, or nearly so, truncate : pappus of disk-achenes of 7 — 10 oblong 

 fimbriate-toothed pointless palese. — Dry hills of Marin, Sonoma and 

 Napa counties. July — Oct. 



2. C. cephalotes, DO. Stem simple, or with few ascending branches, 

 %—l% ft- high: herbage sweet-scented: few-flowered heads densely glom- 

 erate and sessile at the summit and in all the upper axils: small floral leaves 

 densely hispid-ciliate: involucral bracts 1—3, only a third the length of 

 the cup of the receptacle : ./t white, with a reddish tinge, ray-achenes 

 with prominent turgid angles and faintly rugose sides: disk-achenes 

 appressed-villous, their pappus as long as the achene and of about 8 

 chaffy scales which are alternately acuminate-pointed and pointless. — 

 Marin to Napa Co., and northward. June — Aug. 



42. BLEPHARIZONIA, Greene. Stout and rather coarse glandular- 

 viscid and hirsute heavy-scented annuals, with linear entire lower, and 

 oblong upper leaves. Ray-flowers 7 — 10, with 3-lobed white ligules. 

 Disk-flowers 10 — 30, the outer ones subtended by linear chaff. Achenes 

 silky-hirsute, 10-striate, those of the ray partly embraced by the involu- 

 cral bracts and without pappus; those of the disk surmounted by many 

 densely plumose awns. 



1. B. plumosa (Kell.), Greene. Somewhat paniculately branching 

 from the base, the branches bearing, racemosely, many heads, these 

 15— 20-flowered: ray achenes with a minute crown of short scales, those 

 of the disk 20 or more erect plumose bristles half as long as the achene. 

 — Plains near Antioch. Aug.--Oct. 



2. B. laxa, Greene. Larger, 3—6 ft. high, loosely paniculate above, 

 the large heads borne singly at the ends of the branches, 20 — 25-flowered: 

 pappus of ray- and disk-achenes alike, short and spreading, less plumose 

 than in the preceding, only a fifth as long as the achene. — Habitat of 

 the other species. 



43. ACHYRACHJ3NA, Schauer. Soft-pubescent sparingly branching 

 annual, with narrow leaves, and rather large oblong-campanulate seem- 



