1G0 t7MBELLIF$RA. (t'AKSLKY FAMILY.) 



lobed or toothed leaves, and white or blue bractcd flowers closely sessile in 

 dense heads. 



* Fruit scahj : stems erect. 



1. E. yuccsefolium, Michx. Leaves linear, concave, bristly or some- 

 what spiny on the margins, parallel-veined ; leaves of the involucre mostly 

 entire, sh6rter than the broadly ovate head ; bracts entire. — Pine barrens, most- 

 ly in damp soil, Florida, and northward. June. 1J. — Stem 2° -3° high. 

 Leaves distant, the lowest ones l°-l£° long. Flowers white. 



2. E. Ravenelii, Gray. Leaves linear, elongated, nearly terete, grooved 

 on the upper surface, obscurely denticulate; leaves of the involucre 3-eleft, as 

 long as the head ; bracts 3-clcft, spine-pointed, longer than the flowers. — Low 

 pine barrens, near the head-waters of Cooper river, South Carolina. Iiavenel. 

 Sept. and Oct. — Stem l£° - 3° high. Flowers white. 



3. E. Virginianum, Lam. Leaves linear-lanceolate, flat; the lowest 

 ones spiny-serrate with the teeth incurved, or nearly entire, veiny ; the upper 

 narrower, spiny or pinnatifid ; leaves of the involucre (blue) 3-5-clcft, longer 

 than the head; bracts 3-clcft, as long as the flowers. — Marshes, Florida to 

 Mississippi, and northward. July. 1J. or (2) — Stem 2° -3° high. Flowers 

 blue. 



4. E. praealtum, Gray. Leaves lanceolate, flat, veiny, serrate; the up- 

 per ones linear, spiny-toothed; leaves of the involucre 2-3 times as long as the 

 head ; bracts tricuspidate, barely as long as the mature calyx. (E. Virginia- 

 num, Ell.) — Fresh marshes near the coast, Georgia to North Carolina. August. 



— Stem 4°-G° high. Lowest leaves l°-2° long and 2^-3' wide. Flowers 

 white. 



5. E. virgatum, Lam. Leaves short, oblong or oblong-ovate, serrate, 

 the upper ones toothed or divided; leaves of the involucre entire, or with 2-4 

 bristly teeth, longer than the head ; bracts 3-toothcd. (E. ovalifolium, Miehx.) 



— Pine-barren swamps, Florida to North Carolina, and westward. August. — 

 Stem 1°- 2° long. Leaves 2' -3' long, sometimes cordate. Flowers blue. 



* * Fruit granular : stems diffuse. 



6. E. aromaticum, Baldw. Stems clustered, prostrate, very leafy; 

 leaves spatulate, pinnately lobed, cartilaginous on the margins; the 3 upper 

 lobes broad and spine-pointed, the lower ones scattered and bristle-like ; leaves 

 of the involucre 3-clcft, longer than the globose head ; bracts 3-toothed. — Dry. 

 pine barrens, East and South Florida. Sept. — Stems 1' long. 



7. E. Baldwinii, Spreng. Small, prostrate, branching; leaves thin ; the 

 earliest ones ovate, sharply serrate or toothed, long-pctioled, the others 3-parted, 

 with the middle segment lanceolate and commonly 3-toothed ; leaves of the in- 

 rolucre subulate, longer or shorter than the oblong head; bracts spatulate, ob- 



ding the, calyx.— Low sandy pine barrens, Georgia, Florida, 

 and westward. September. (j) ? — Stems 5'- 10' long. Flowers blue. 



8. E. Cervantcsii, Laroch. Stems prostrate, diffusely branched; carli- 

 st leaves lanceolate or oblong, entire, or sparingly toothed, long-pctioled, the 



others sessile, 3-partcd, with the segments linear or filiform and entire; leaves 



