190 CABDUACEAE. 



Blades of the cauline leaves with nurlculnte-cordate clasping 



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

 Leaves neither succulent nor fleshy. 



Leaves silky or canescent. t concolor 



Leaves glabrous or pubescent, neither silky nor 



canescent 



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



Llgules of the ray white or pale. 



Leaves of the flowering branches very short, 



scale-like: heads few-flo\ 4. A. coridifoliM. 



Leaves of the flowering branches relatively 



long, narrow : beads many-flowered. 

 Involucral bracts with broad green tips : 



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



Involucral bracts with narrow green tips : 



disk-corollas 6-7 mm. long. 6. .4. 8vl:nerae. 



Leaves with succulent or fleshy blades. 



Inner bracts of the Involucre 5-6 mm. long, acuminate. 7. A. crili*. 



Inner bracts of the Involucre 3-4 mm. long, acute. 8. A. BracH. 



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 corymbose: involucres hemispheric; bracts with dilated recurved 

 tips: ligules purple or pinkish, 1.5-2 cm. long: disk-corollas 7-0 mm. long: 

 achenes 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 cane-.vnt. 

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

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

 long: achenes pubescent. Pinelands. 



3. A. adnatus Xutt. 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 inter: 

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

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



4. A. coridifolius Miehx. Stem and branches erert or a-.. -n. ling. 1 m. tall or 

 less, glabrous: upper leaves lax or spreading; blades linear to oblong gl:i)>n>u-, 

 sessile: heads scattered : involucres campamilate: l>rart> -month, the inner ones 

 slightly dilated near the apex: ligules white, pink, or pale violet. .". > mm. 

 long. Everglades and low pinelands. 



5. A. Simmondsii Small. Stem and branched 1-4 dm. tall, minutely put 

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

 heads solitary or few: involucres campanulate-hemisphi -r\> : l-r:n-ts 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 pub* 

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

 involucres campanulate tnrhinate; 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-subulate: heads panidod: involucres turl 

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

 Hammocks. (Bo*., Cuba.) 



8. A. Brace! Rritton. Plants perennial, 2-9 dm. tall: HJ.J..T leaves more or 

 less spreading: blades narrowly linear to linear-subulate: heads corymbose: 

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

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



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

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



