190 CAEDUACEAE. 



Blades of the cauline leaves with auriculate-cordate clasping bases. 



„,,.., ,. , , .. 1- -4- caroUnianus. 



Blades of the caulme leaves merely sessile, or nearly so. 

 Leaves neither succulent nor fleshy. 



Leaves silky or canescent. ' 2. A concolor 



Leaves glabrous or pubescent, neither silkv nor 

 canescent. 

 Ligules of the ray violet: leaves adnate. 3. A. adnattis 



Ligules of the ray white or pale. 



Leaves of the flowering branches very short, 



scale-like : heads few-flowered. ' 4. A. coridifolius. 



Leaves of the flowering branches relatively 

 long, narrow : heads many-flowered. 

 Involucral bracts with broad green tips : 



disk-corollas 4-5 mm. long. 5. A. SimmondsU. 



Involucral bracts with narrow green tips : 



disk-corollas 6-7 mm. long. G. A. Sulznerae. 



Leaves with succulent or fleshy blades. 



Inner bracts of the involucre 5-6 mm. long, acuminate. 7. A. cxilis. 



Inner bracts of the involucre 3-4 mm. long, acute. 8. A. Bracei. 



1. A. carolinianus Walt. Stem and branches reclining or climbing, 1-5 m. 

 long, tomentulose: upper leaves spreading; blades oblong, elliptic, or oval, 

 varying to ovate or obovate, finely pubescent, dilated and clasping at the base: 

 heads loosely corj-mbose : involucres hemispheric ; bracts with dilated recurved 

 tips: ligules purple or pinkish, 1.5-2 cm. long: disk-corollas 7-9 mm. long: 

 aehenes glabrous. — Everglades and wet hammocks. 



2. A. concolor L. Stem and branches stiff, 2-11 dm. tall, silky or canescent: 

 upper leaves erect or appressed; blades lanceolate to ovate, silky or canescent, 

 sessile : heads in virgate racemes : involucres turbinate ; bracts with narrow 

 erect tips: ligules lilac or rose-purple, 6-8 mm. long: di.sk-corollas about 5 mm. 

 long: aehenes pubescent. — Pinelands. 



3. A. adnatus Nutt. Stem and branches erect or ascending, 2-8 dm. tall, 

 hispidulous: upper leaves scale-like, appressed; blades oblong, lanceolate, or 

 ovate, scabrous, sessile and partially adnate to the adjacent internodes: heads 

 scattered: involucres eampanulate; bracts scabrous, the inner ones linear: 

 ligules violet. 7-10 mm. long. — Pinelands. — F. K. (Bah.) 



4. A. coridifolius Michx. Stem and branches erect or ascending, 1 m. tall or 

 less, glabrous: upper leaves lax or spreading; blades linear to oblong, glabrous, 

 sessile : heads scattered : involucres eampanulate ; bracts smooth, the inner ones 

 slightly dilated near the apex: ligules white, pink, or pale-violet, 3-6 mm. 

 long. — Everglades and low pinelands. 



5. A. Simmondsii Small. Stem and branches 1-4 dm. tall, minutely pubescent: 

 upper leaves erect or ascending; blades linear or nearly so, glabrous, sessile: 

 heads solitary or few: involucres campanulate-hemispheric ; bracts stout, the 

 inner 5-6 mm. long, acute: ligules pink, 5-7 mm. long. — Everglades. 



6. A. Sulznerae Small. Stem and branches 1 m. tall or less, finely pubescent: 

 upper leaves lax ; blades narrowly linear, glabrous, sessile : heads corymbose : 

 involucres campannlate-turbinate; bracts slender, the inner acuminate: ligules 

 deep-pink, 8-11 mm. long. — Shores of the Miami river. 



7. A, exilis Ell. Plants annual, 3-12 dm. tall: upper leaves erect or ascending; 

 blades narrowly linear to linear-sul)ulate: heads panicleil : involucres turbinate; 

 bracts slender, the inner ones equalling or exceeding the top of the disk. — 

 Hammocks. — (Bah., Ctiba.) 



8. A. Bracei Britton. Plants perennial, 2-9 dm. tall: upper leaves more or 

 less spreading; Vjlades narrowly linear to linear-subulate: heads corymbose: 

 involucres campanulate-turbinate; bracts stout, the inner ones not reaching to 

 the top of the disk. — Everglades. — F. K. (Bah., Cuba.) 



15. ERIGERON L. Herbs. Leaves alternate, sometimes mostly basal: 

 blades entire or toothed. Heads solitary or numerous, conspicuously radiate. 



