246 COMPOSITE. (COMPOSITE FAMILY.) 



2. B. frutescens, DC. Branches aud leaves hoary-tomentose ; leaves 

 varying from spatulate-liuear to obovate-obloug, entire, or toothed near the 

 base; scales of the involucre shorter than the disk, the inner ones and chaff 

 of the receptacle spine-pointed. Saline marshes, Florida to North Carolina. 

 June - Oct. Stem 1 - 2 high. 



46. WEDELIA, Jacq. 



Heads many-flowered, radiate. Flowers of the ray pistillate, of the disk 

 perfect, tubular, 5-toothed. Scales of the involucre in 2-3 rows, the outer 

 ones leafy, the inner membrauaceous. Receptacle convex, chaffy. Achenia 

 obovate or compressed. Pappus calyx-like, composed of united deutate and 

 cilfate scales. Herbs or uudershrub.s, with opposite serrate leaves, and mostly 

 solitary yellow flowers. 



1. W. carnosa, Rich. Herbaceous, smooth, creeping; leaves sessile, 

 thick, obovate, slightly 3-lobed ; heads axillary, peduncled ; outer scales of the 

 involucre oblong, as long as the disk, the inner ones smaller; acheuia wing- 

 loss. Springy places, Key Biscayne ( Cttrtiss). 



47. MELANTHERA, Rohr. 



Pleads many-flowered ; the flowers all tubular and perfect, 5-cleft. Scales 

 of the involucre imbricated in 2 rows. Chaff of the convex receptacle rigid, 

 persistent, partly sheathing the flowers. Achenia 4-angled, short, truncate at 

 the apex. Pappus of 2 -several rough rigid deciduous awns or bristles. 

 Rough perennial herbs, with brandling 3-4-augled steins, opposite undivided 

 or 3-lobed serrate petioled leaves, and scattered heads of white flowers, on 

 long peduncles. Anthers black. 



1. M. hastata, Michx. Stem commonly spotted; leaves ovate, entire, 

 or more or less hastate-3-lobed, serrate; scales of the involucre lanceolate, 

 acute; chaff of the receptacle spine-pointed. Light rich soil, Florida to 

 South Carolina. August - Sept. Stem 3 - 6 high. 



2. M. deltoidea, Michx. Leaves deltoid-ovate, undivided ; scales of the 

 involucre ovate ; chaff of the receptacle obtuse, mucronate. South Florida. 



3. M. lanceolata, Benth. Leaves lanceolate, or narrower and tapering 

 from the apex to the base ; scales of the involucre oblong-lanceolate ; chaff 

 of the receptacle cuspidate. Coast of South Florida. 



48. ZINNIA, L. 



Heads many-flowered ; the ray flowers pistillate ; those of the disk perfect, 

 tubular, with 5 velvety lobes. Scales of the involucre imbricated, oval or 

 roundish, margined. Chaff of the conical receptacle clasping the disk flowers. 

 Ray flowers oblong, rigid persistent. Achenia of the disk compressed, with 

 a 1 - 2 awned pappus ; of the rays 3-angled, destitute of a pappus. Annual 

 herbs, with sessile entire 3-ribbed leaves, aud solitary heads, >n long inflated 

 peduncles. 



