544 



COMPOSITE. 



1. B. chrysanthemoides Michx. Bur Marigold. Often de- 

 cumbent at base, 1 to 3 or even 4 ft. high, glabrous; leaves lanceolate, 

 usually tapering at the base, evenly serrate, more or less connate at 

 base, 7 in. long or less; outer involucre rather longer than the inner, 

 much surpassed by the oval golden brown rays, these 1 in. long or 

 more; disk brownish; heads in fruit erect, seldom slightly nodding; 

 achenes flat or flattish, cuneate, distinctly carinate on the sides and 

 retrorsely hispid on the marginal angles; awns 2 or 3, retrorselv 

 barbed. — (B. hevis B.S.P.) 



Low wet ground: Alvarado marshes: lower Sacramento River. 

 Sept.-Oct. 



Var. Nashii (B. Nashii Small). Leaves minutely serrate or almost 

 entire, somewhat fleshy, some of the upper often very broad at base 

 but rarely clasping; achenes slightly contracted at summit. — San 

 Francisco, acc. to Wiegand. 



2. B. cernua L. Smaller Bur Marigold. Stems 8 to 20 in. 

 high, glabrous or setulose-hispid; leaves oblong-lanceolate, rather 

 irregularly serrate, mostly not connate; outer involucral bracts 

 exceeding the disk, spreading, foliaceous; rays 6 to 10, mostly light 

 yellow, 3 to 6 lines long, sometimes none; heads strongly nodding in 

 fruit; achenes 4-angled and usually 4-awned. 



Less common than the last. 



3. B. frondosa L. Beggar-ticks. Erect, 3 or 4 ft. high, gla- 

 brous or slightly pubescent; leaves 3 to 5-divided, the divisions or 

 leaflets petiolulate, lanceolate, coarsely toothed; rays 1 to 5, incon- 

 spicuous, usually shorter than the greenish yellow disk; achenes very 

 flat, cuneate-oblong, 4 to 5 lines long, dentate on the margin with 

 barbs upwardly pointed (except at the summit), 2-awned; heads erect 

 in fruit, surpassed by the outer foliaceous bracts. 



Lower Sacramento River; very common. Sept. 



62. LEPTOSYNE DC. 



Perennials with thickened fleshy stems or ours annuals and almost 

 acaulescent. Leaves dissected into narrowly linear or filiform lobes. 

 Fowers yellow, in showy heads on long naked peduncles. Rays 

 several or numerous, oblong or obovate, 3-toothed at apex. Involu- 

 cre double; bracts of the inner series 8 to 12, erect, membranous; 

 bracts of the outer series 5 to 8, narrow, loose and foliaceous. Recep- 

 tacle nearly flat, its bracts thin, scarious, linear or lanceolate, falling 

 with the fruit. Achenes flattened, more or less wing-margined, alike 

 in disk and ray. Pappus a minute ring or cup, or consisting of 

 linear palea?. (Greek leptosune, slenderness.) 



Achenes alike in ray and disk; pappus cup-shaped; corolla-tube without a 

 hairy ring LL Stillmani. 



Achenes of 2 different shapes, those of the disk long-villous; pappus palea- 

 ceous; corolla-tube with a hairy ring towards the summit 



2. L. calliopsidea. 



1. L. Stillmani Gray. Nine to 12 in. high, stoutish, leafy below 

 and with manifest branches; leaf-di visions 1 line broad; involucre 



