176 UMBELLIFEB^E. (PARSLEY FAMILY.) 



tures, the floral ones opposite or whorled. Flowers blue or white, closely ses- 

 sile iii cymose bracted heads, the lower bracts empty arid iiivolucrate. 



* Stems erect : heads in a terminal leafy cyme. 

 H- Leaves parallel-veined : spinulose-ciliate. 



1. E. yuccsefolium, Michx. (BUTTON SNAKEROOT.) Stem stout, 2 - 

 4 liigh ; leaves linear-lanceolate, 1 - 2 long, the cilias single ; involucre 7-8- 

 leaved, shorter tkan the ovate head ; bracts cuspidate, entire. Woods and 

 margins of fields, in the middle and upper districts. July. Flowers whitish. 



Var. synchsetum, Gray. Stem slender, l-2 high; leaves narrower, 

 the cilice 2-3 together. Sandy pine barrens in the lower districts. July. 



2. E. longifolium, Cav. Stem slender, 2 -3 high; leaves linear, as 

 long as the stem, the cilise few and remote ; heads long-peduucled, globose, 

 \' - J' long, twice as long as the involucre ; bracts ovate, cuspidate, entire. 

 Manatee, South Florida (Simpson). 



H- t- Veins of the leaves diverging or reticulate : petioles crossbarred (except 



No. 9). 



3. E. Floridanum, Coulter & Rose. Stem mostly simple, 2-3 high ; 

 lower leaves long-petioled, ovate or oblong, rarely cordate, the floral ones 3- 

 parted, toothed; leaves of the involucre 10-13, 1-2-toothed, or entire, about 

 as long as the ovoid head ; bracts linear-subulate, entire ; flowers blue. 

 Soutli Florida. 



4. 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-toothed. (E. ovalifolium, Michx.) 

 Pine barren swamps. August. Stem l-2 long. Leaves 2' -3' long, 

 sometimes cordate. Flowers blue. 



Var. LudOVisianum, Morong. Stem slender, 2 high, branching; lower 

 leaves lanceolate, denticulate, 2' long, the upper linear; involucre twice as 

 long as the small (3" -4" wide) globose head. Louisville, Georgia (Hopkins, 

 Elliott}, and westward. 



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

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

 long as the head; bracts equally 3-cleft, spine-pointed, longer than the mu- 

 crounlate calyx lobes. Marshes, Florida to South Carolina. Sept. - Oct. 

 Stem H - 3 high. Flowers blue. 



6. E. Mettaueri, Wood. Mostly taller (3 -6 high); radical leaves 

 broadly linear, flat, obscurely denticulate, the petiole prominently crossbarred ; 

 stem leaves more stronglv denticulate ; leaves of the involucre mostly longer 

 than the head, pale or bluish above ; flowers blue. Fresh marshes along the 

 west coast of Florida. July - August. 



7. E. Virginianum, Lam. Stem slender, l-2high; lowest leaves 

 linear-lanceolate, long-petioled, flat, incurved-serrate or entire, the upper spinu- 

 lose ; involucre as long as the head ; bracts unequally toothed, the middle 

 tooth as long as the slender-pointed calyx lobes ; flowers pale blue or whitish. 



- Margins of ponds and streams. July- August. 



