176 UMBKLLIFIiUJE. (PARSLEY FAMILY.) 



tiires, the floral ones opposite or wliorled. Flowers blue or white, closely ses- 

 sile ill ivinose bractoil lieads, the lower bracts empty and iiivolucrate. 

 ♦ Sicms erect: heads in a terminal leafy cijme. 

 t- /.tares jiarallel-teined : sjiinulose-citiate. 



1. E. yuccsefolium, Michx. (Bitton Snakekoot.) Stem stout, 2°- 

 4° high; leaves linear lanceolate, l°-2°long, the ciliae single ; involucre 7-8- 

 leavcd, sliorter tlian tlie ovate head ; bracts cuspidate, entire. — Woods and 

 margins of fields, in the middle and upj)er districts. July. — Flowers wliitish. 



\'ar. synchsetum, Gray, ytem slender, l°-2°high; leaves narrower, 

 the cili;e 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 ciliae few and remote ; heads long-pediiucled, globose, 

 i' -i' long, twice as long as the involucre ; bracts ovate, cuspidate, entire. — 

 Manatee, South Florida (Siinpson). 



■*- •*- Veins of the leaves diverging or reticulate: petioles crossbarred (except 



No. 9). 



3. E. Floridanum, Coulter & Hose. Stem mostly simjjle, 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-tootlied, or entire, about 

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

 South 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 teetli, 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 lanceolatt, 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 deuticuLite ; leaves of the involucre 3-cleft, as 

 long as the head; bracts equally 3-cleft, spine-])ointed, longer than the mu- 

 crouulate calvTC lobes. — Marshes, Florida to South Carolina. Sept. - Oct. — 

 Stem U° - 3° high. Flowers blue. 



6. E. Mettaueri, Wood. Mostly taller (.'?°-6° high); radical loaves 

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

 stem leaves more strongly 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°-2°high; lowest leaves 

 linear-lanceolate, long-pelioled, flat, iucurved-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 lol)es ; flowers pale blue or whitish. 



— Margius of ponds and streams. July- August. 



