244 COMPOSITE, (composite family.) 



72. ERECHTHITES, Kaf. Fiukwkkd. 

 Heads mnny-Howcivd, discoid ; the niargiiial flowers pistillate, verj- slender, 

 2-3-tootlR(l ; the others peifeet, 4 - 5-tootiied. Scales of tiie eylindrieul involu- 

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

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

 simple leaves, and corymbose heads of grceni.sh flowers. 



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

 lanceolate, sessile, sharply serrate or toothed ; the upi)er somewhat clasping ; 

 bracts subulate, minute ; pappus white. (Senecio hicracifolius, L) — Rich soil, 

 common. July - Sept. — Stem 1° - 5° high. 



73. CACALIA, L. 



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

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

 cular jjrnniinencc 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. 



* Receptacle flat : involucre about I2leaved, 25-30-flowered. 



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

 serrate, on winged ])etioles ; the uppermost sessile ; bracts flliform. — Low 

 ground, West Florida, and northward. Sept. and 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 petioles ; the lowest large, reniform, the upper ones roundish ; 

 corymb compound. — Damp soil in the mountains of North Carolina and TeUr 

 nessee. July and Aug. — 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 lol)ed, the lobes mostl}'^ entire, mucronate ; 

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

 and moist banks, Florida, and northward. — Aug. and Sept. — Stem 4° - 8° high. 

 Leaves smaller and thicker than the last. 



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

 ]>ctioled ; the lowest broadly cordate or cordate-ovate, obtusely toothed, the upper 

 3 - 5-lobed. — Muddy banks of the Chipola River, Marianna, West Florida. 

 May - Aug. — Stem 2° - 3° high. 



5. C. ovata, Walt. Stem terete; leaves glaucous beneath, 3- .5-ncivcd, 

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

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

 July and Aug. — Stem 3° - 4° high. Lowest leaves 5' - 8' long. 



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

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

 long-petioled ; corymbs dense. — Swamps, Georgia, Florida, and westward. 

 Aug. and Sept. — Stem 3° - 5° high. Leaves thick. 



