COMPOSIT.E. (composite FAMILY.) 267 



involucre in a single row, linear, acute, bracted. Receptacle naked. Achenia 

 oblong, striate. Pappus of copious soft hairs. — Erect annual herbs, with 

 alternate simple leaves, and corymbose heads of greenish flowers. 



1. E. hieracifolia, Kaf. Stem mostly branched, smooth or hairy ; leaves 

 lanceolate, sessile, sharply serrate or toothed ; the upper somewhat clasping; 

 bracts subulate, minute ; pappus white. — Rich soil, common. July- Sept. — 

 Stem l°-5°high. 



83. CACALIA, L. 



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

 Scales of the involucre 5-30, in a single row. Receptacle flat, naked, or with 

 a tubercular prominence in the centre. Achenia oblong, smooth. Pappus 

 of numerous capillary bristles. — Perennial, mostly smooth and tall herbs, 

 with alternate entire or lobed leaves, and corymbose heads of white flowers. 

 * Rereptadejiat : involucre about \2-leaved, 2o -30-Jlowered. 



1. C. suaveolens, L. Smooth; leaves ovate, hastate, acute, toothed- 

 serrate, on winged petioles ; the uppermost sessile ; bracts filiform. — Low 

 ground, West Florida, and northward. Sept. - Oct. — Stem 3° - 5° high. 



* * Receptacle tubercular in the centre : scales of the involucre and flowers 5. 



2. C. reniformis, Muhl. Stem angled ; leaves not glaucous, angularly 

 toothed, on slender jietioles ; the lowest large, reniform, the upper ones 

 roundish; corymb compound. — Damp soil in the mountains of Nortli Caro- 

 lina and Tennessee. July -August. — Stem 4° -9° high. Radical leaves 

 sometimes 2° in diameter, the teeth mucronate. 



3. C. atriplicifolia, L. Stem terete, corymbosely branched above; 

 leaves glaucous beneath, angularly lobed, the lobes mostly entire, mucronate ; 

 the lowest ones reniform ; the upper rhomboid ; corymbs compound. — Woods 

 and moist banks, Florida, and nortliward. August - Sept. — Stem 4° - 8° 

 high. Leaves smaller and thicker than the last. 



4. C. diversifolia, Torr. & Gray. Stem angled ; leaves not glaucous, 

 petioled ; the lowest broadly cordate or cordate-ovate, obtusely toothed, the 

 upper 3 - 5-lobed. — Muddy banks of the Chipola River, Marianua, West 

 Florida. May - August. — Stem 2° - 3° high. 



5. C. OVata, Walt. Stem terete ; leaves glaucous beneath, 3-5-nerved, 

 ovate or oval, obtuse, entire or wavy-toothed ; the lowest long-petioled ; the 

 upper ones sessile ; corymbs open. — Swamps, Georgia, Florida, and westward. 

 July - August. — Stem 3° - 4* high. Lowest leaves 5' - 8' long. 



6. C. tuberosa, Nutt. Stem angled ; leaves not glaucous, oval or 

 lanceolate-oblong, strongly 5 - 7-nerved, entire or slightly toothed ; the lowest 

 long-petioled ; corymlts dense. — Swamps, Alabama, and westward. August - 

 Sept. — Stem 3° - .5° high. Leaves tliick. 



7. C. Floridana, Gray. Stem stout, furrowed, 2° -4" high; leaves 

 oval, strongly nerved, dentate-serrate, the lower long-petioled ; lobes of the 

 corolla as long as the throat. — Dry sandy barrens, East Florida. Sept. 



8. C. lanceolata, Kutt. Stem terete ; leaves rather fleshy, lanceolate 

 or linear-lanceolate, entire or coarsely toothed, 3-nerved, somewhat glaucous ; 



