!.")! COMPOSITAB. 



olate, coarsely toothed; rays 1 to 5, inconspicuous, usually shorter than the 

 greenish yellow disk; achenes very flat, euneate-oblong, 4 to 5 lines long, 

 dentate on the margin with barbs upwardly pointed (except at the summit), 

 2-awned; heads erecl 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 acaules- 

 cent. Leaves dissected into narrowly linear or filiform lobes. Flowers yellow, 

 in showy heads on long naked peduncles. Kays several or numerous, oblong 

 or obovate, 3-toothed at apex, [nvolucre double; bracts of the inner series 

 8 to L2, erect, membranous; bracts of the outer series 5 to 8, narrow, loose 

 and folia. ••■nis. Receptacle nearly flat, its bracts thin, scarious, linear or 

 lanceolate, falling with the fruit. Achenes flattened, more or less wing-mar- 

 gined. Pappus a minute ring or cup, or consisting of linear paleae. (Greek 

 leptosune, slendemess.) 



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



1. L. stillmanii. 



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



tuhe with a hairy ring towards the summit 2. L. calliopsidca. 



1. L. stillmanii Gray. Nine to 12 in. high, stoutish, leafy below and with 

 manifest branches; leaf-divisions 1 line broad; involucre commonly somewhat 

 hairy at base; disk-corollas beardless; achenes surrounded by a thick and 

 corky rugose wing, smooth and glabrous on the back, the inner face sparsely 

 papillose, or with a row of tubercles on the median ridge; pappus-cup either 

 entire or 2-lobed. 



Sacramento Valley. 



2. L. calliopsidea Gray. Leafy, with less scape-like peduncles, 1 to 2 ft. 

 high; bracts of the outer series of the involucre broadly ovate, a little shorter 

 than the narrowly ovate inner ones, commonly 1 in. long, % in. wide and 15 

 to 20-nerved; ring of the disk-corolla pubescent; achenes of the ray- and outer 

 disk ilowers oval, flat and glabrous; disk-achenes euneate-oblong, long-villous 

 on the margins and inner face; pappus-paleae 2, linear. 



Moist hillsides in the South Coast Eanges; Southern California. 



Tribe 8. Ambrosieae. Ragweed Tribe. 

 63. IVA L. 

 Ours coarse herbs with thickish alternate (or the lower opposite) leaves and 

 small nodding heads of greenish white (lowers. Involucre hemispherical, its 

 bracts few and rounded. Receptacle with (hall' like linear or spatulate bracts. 

 Marginal (lowers of the head pistillate, 1 to 5 in number, their corollas tubular 

 01 none. Disk Ilowers perfect, with 5-lobcd funnelforin corolla and undivided 

 Btyle. Anthers almost distinct. Achenes flattened, glabrous. Pappus none. 

 (Said to be named after Aguga Lva of the Mint Family, on account of the 



similar odor.) 



1. I. axillaris Pursh. POVEBT"! WEED. Stems many, erect from a de- 

 cumbent or prostrate base. 6 to 10 in. high; Leaves narrowly obovate, varying 

 to lanceolate or linear, entire, seS8ile; heads solitary in the axils, short- 

 peduncled, surpassed by the leaves; bracts of the involucre united into a 

 lobed or merely toothed cup. 



Alkaline plains and borders of snlt marshes: ('oast Ranges; Sacramento 



Valley; Ban Joaquin Valley; Southern California; British Columbia; Nebraska. 

 Aug.-Sept. 



