COMPOSIT.E. (composite FAMILY.) 243 



2. B. subacaulis, Nutt. Rongh-pubescent and somewhat hoary ; leaves 

 chieflj- radical, clustered, siuuate-piuiiatifid ; heads solitary on the peduncle- 

 like stem, or few on the peduncle-like liranclies of the short and nearlv leafless 

 stem. — East Florida and Georgia. ^lay- August. — Peduncle 6' -8' lonf^. 

 Leaves 3' long. 



39. LINDHEIMERIA, Gray & Engelm. 



Ray flowers 4-5. Scales of the involucre in two rows, the outer ones 

 linear, the inner ones oblong, adherent to tlie base of the fertile achenia, and 

 to the adjacent scales of the receptacle. Achenium oval, flat, the narrow wings 

 prolonged into a 2-toothed pappus. Otherwise like Berlandiera. 



1. L. Texana, Gray & Engelm. — Alabama (Mohr), and w-estward. — 

 Annual, hirsute, erect, l°-2° iiigh. Leaves oblong, dentate. Heads in a 

 dichotomous panicle, nodding. Flowers yellow. 



40. PARTHENIUM, L. 



Heads many-flowered ; the ray flowers .5, in a single row, short, obcordate, 

 pistillate ; those of the di.sk tubular, 5-tootlied, sterile. Anthers slightly 

 imited. Scales of the involucre in two rows, ovate or roundish. Receptacle 

 conical, chaffy ; the chaff dilated upward. Achenia smooth, compressed, 

 thick-margined. Pajipus of two awu-like or roundish scales. — Herbs. Leaves 

 alternate. Flowers white. 



L P. integrifolium, L. Perennial; stem erect, simple, rough ; leaves 

 undivided, ovate or oblong-ovate, serrate ; the lowest narrowed into a long 

 petiole ; panicle dense, corj-mbose ; involucre hoary ; pappus minute, awn- 

 like. — Dry woods in the upper districts. August. — Stem l°-2° high. 

 Lowest leaves 4' -6' long. Rays cousjjicuous. 



2. P. Hysterophorus, L. Annual, pubescent ; stem diffuse ; leaves 

 pinnatifid, with linear toothed lobes ; heads loosely panicled ; scales of the 

 pappus oval. — Waste places, Florida, and westward. 



41. IVA, L. 



Heads few- or many-flowered ; the flowers all tulnilar ; the marginal ones 

 (1 -.5) with a short corolla, pi.stillate nnd fertile; the central .5-toothed, sterile. 

 Anthers nearly distinct. Scales of the involucre 3 - 5, in a single row, oval or 

 obovate, distinct or partly united, or 6-9 and imbricated. Chaff of the small 

 receptacle linear or spatulate. Achenia biconvex, obovate. Pappus none. — 

 Branching herbs or shrubs, with opposite or (the upper) alternate mostly 

 fleshy leaves, and small axillary nodding hefids of whitish flowers. 

 * Scales of the invohicre 3-5, in a single roic. 



1. I. frutescens, L. Shrubby; leaves lanceolate or oblong, sharply 

 toothed-serrate, 3 ril)bed, smoothish; scales of the involucre 5, orbicular; 

 fertile flowers 5. — Saline marshes, Florida, and northward. August -Sept. 

 — Shrub 4° -8° high. 



2. I. miorocephala, Xutt. Annual, rough with rigid appressed hairs; 

 stem .slender, simple or branched; leaves narrow-linear, entire ; heads minute, 



