544 coMPOsiTJi. 



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

 cumbent at base, 1 to 3 or even 4 ft. high, glabi-ous; 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, retrorsely 

 barbed.— (B. laevis 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, ace. to Wiegand. 



'2. B. cernua L. Smaller I5ur 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. Bbqgar-ticks. Erect, 3 or 4 ft. high, gla- 

 brous or slightly pubescent; leaves 8 to 5-divided, the divisions or 

 leaflets petiolulate, lanceolate, coarsely toothed; rays 1 to 6, incon- 

 spicuous, usually shorter than the greenishyellow 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 show}' 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 nearlj' 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 palea3. (Greek leptosuue, slenderness.) 



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

 hairy ring 1. i. Stillmani. 



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

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



2. L. calUopsUlea. 



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

 and with manifest branches; leaf-divisions 1 line broad; involucre 



