200 COMPOSITE. 



the whole completely enfolding its obcompressed achene. Kays 820; 

 their achenes obovate -oblong or narrower, without pappus. Disk- 

 flowers with cylindraceous-funnelform 5-lobed corollas; their achenes 

 linear-cuneiform, usually with a pappus of bristles or awns. Eeceptacle 

 flat, bearing a series of chaffy bracts between ray- and disk-flowers, 

 'these, with the involucral bracts, mostly deciduous when mature, leaving 

 a naked receptacle. 



* Pappus of 10 20 bristles which are stout, and, below the middle, 

 long-plumose. 



^Hairs of pappus-bristles not interlaced. 



1. B. heterotrichus (DC.), Greene. Erect, 1 ft. high or more branch- 

 ing from the base, rough-hirsute or hispid and glandular: lower leaves 

 lanceolate: laciniate-pinnatifid or incised, the upper entire: rays large, 

 white: long- villous hairs of the pappus-bristles all erect and straight. 

 Eastern base of the Mt. Diablo Range, on sandy plains. April, May. 



2. B. graveolens, Greene. Stout, erect, 2 ft. high or more, sparingly 

 branching, hirsute, and with numerous rigid gland-tipped hairs inter- 

 spersed: leaves all entire: heads very large, rays of a creamy white: 

 achenes slenderly clavate; pappus when mature deciduous in a ring, the 

 villous wool of the bristles all straight and erect and two-thirds their 

 length. Said to occur on Mt. Tamalpais; but this may be doubted. It 

 may be looked for on the plains of the lower San Joaquin. Apr. June. 



3. B. carnosus (Nutt), Greene. Dwarf, depressed, branched from 

 the base, pubescent; leaves succulent, 1 in. long, linear-oblong or spatulate, 

 entire, or the lowest sinuate-pinnatifid : heads small : rays white, reduced 

 and inconspicuous: pappus-bristles sparsely plumose with straight 

 villous hairs. Sands of the sea beaches in Marin Co., etc. April June. 



4. B. hieracioides (DC.), Greene. Erect, rather strict, 23 ft. high, 

 stoutish, hispid: leaves linear to oblong, laciniate-dentate : rays yellow, 

 short, little exceeding the disk: hairs of the pappus all straight and 

 erect. Var. anomala, Bioletti. Involucral bracts open-boat-shaped, 

 not enfolding the achenes, and persistent on the receptacle after the 

 falling of the fruit. A coarse weedy species of wooded or bushy hills, 

 in half shady places. May, June. 



5. B. gaillardioides (H. & A.), Greene. Freely branching below, 

 1 ft. high or more, hispid: leaves commonly laciniate-pinnatifid: rays 

 orange-yellow, %% in. long: pappus dull-white or sordid, the bristles 

 about twice as long as their copious straight villous basal hairs. Said 

 to be common near San Francisco; which we doubt. 



6. B. neinorosus. Bather slender, sparingly branched above, 1 2 

 ft. high, hispidulous: foliage and heads much as in the preceding, but 



