1 



222 COMPOSITE. (composite family.) 



2. B. SUbacaulis, Nutt Rough-pubescent and somewhat hoary ; leaves 

 chiefly radical, clustered, sinuate-pinnatitid ; heads Bolitary on the peduncle-like 

 stem, or few on the peduncle-like branches of the short and nearly leafless stem. 



— East Florida and Georgia. May - August. — Peduncle G' - b' long. Leaves 

 3' long. 



34. PAHTHENIUM, L. 



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

 pistillate; those of the disk tubular, 5-tOOthed, sterile. Anthers slightly united. 

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

 chaffy ; the chaff dilated upward. Aehcnia smooth, compressed, thick-mar- 

 gined. Pappus of two awn-like or roundish scales. — Herbs. Leaves alternate. 

 Flowers white. 



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

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

 petiole; panicle dense, corymbose ; involucre hoary; pappus minute, awn-like. 



— Dry soil among the mountains, Alabama, and northward. August. — Stem 

 l°-2° high. Lowest leaves 4' -6' long. Pays conspicuous. 



2. P. Hysterophoi'US, L. Annual, pubescent ; stem diffuse ; leaves 

 pinnatifid, with linear toothed lohes ; heads loosely panicled ; scales of the pap- 

 pus oval. — "Waste places, East and South Florida, and westward. 



35. IVA, L. 



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

 (1-5) with a short corolla, pistillate and fertile; the central ones 5-toothed, 

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

 oval or obovate, distinct or partly united, or G - 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 heads of whitish flowers. 



* Scales of the involucre 3-5, in a sinc/Ie row. 



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

 toothed-serrate, 3-ribbed, smoothish; scales of the involucre 5, orbicular; fertile 

 flowei*s 5. — Saline marshes, Florida, and northward. Aug. and Sept. — Shrub 

 4°- 8° high. 



2. I. microcephala, Nutt. Annual, rough with rigid appressed hairs : 

 stem Blender, much branched ; leaves narrow-linear, entire ; head- minute, 6 - 

 12-flowercd ; scales of the involucre 4-5, obovate, ciliate; fertile flowers 1-3. 



— Dry barren Soil, Florida to South Carolina. Aug, and Sept. — Stem l°-2° 

 high. 



* * Scales of the involucre 6— 9, imbricated in 2-4 rows. 



3. I. imbricata, Walt. Somewhat shrubby, smooth ; leaves fleshy, lance- 

 olate, the lower ones slightly Berrate and 3-ribbed, the upper alternate and entire; 

 heads many-dowered ; outer Bcales of the involucre orbicular : the inner obovate, 



