194 COMPOSITAE. (COMPOSITE FAMILY.) 
sessile, 3-nerved, sparingly serrate; corymbs dense; heads 15-20-flowered; - 
scales of the involucre very obtuse, strongly striate. — Near Natchez, Mice 
and South Florida. July- November. — Flowers blue. 
* ** Scales of the involucre purplish, scarious, obtuse, imbricated in several rows, the 
i outer ones much shorter : leaves whorled : flowers purplish. 
2. E. purpureum, L. Smooth or pubescent; stem simple, tall, often 
spotted or dotted; leaves petioled, 3-6 in a whorl, varying from lanceolate to 
. ovate, coarsely serrate, roughish ; corymbs large, compound ; heads 5 - 10-flow- 
ered. — Swamps, rarely in dry woods, Florida to Mississippi, and northward. 
Aug. - Sept. — Stem 39-10? high, solid or hollow, even or grooved. A vari- 
able species, including E. ternifolium, E. maculatum, and E. verticillatum, 
Ell. ? : 
* * * Scales of the involucre (green or white) imbricated in 2-3 rows, the outer ones 
shorter : heads 5 —90-flowered : leaves, achenia, rc. dotted with resinous glands : 
lowers white. 
+ Heads 5-flowered: leaves undivided, sessile or narrowed into a stalk-like base 
(except No. 12.) 
3. E. hyssopifolium, L. Pubescent; leaves opposite, the upper ones 
alternate, lanceolate or ovate-lanceolate, coarsely serrate or toothed, 3-ribbed at 
the base ; scales of the involucre lanceolate, obtuse, mucronate, shorter than the 
flowers. (E. linearifolium, Walt.) — Varies with the leaves narrow-linear and 
entire, the lower ones 4 in a whorl, and numerous smaller ones in the axils.— . 
Low ground, Florida to Mississippi, and northward. Sept. — Stem 30-8 
high. Leaves rigid, sometimes all alternate. 
4. E. cuneifolium, Willd.  Pubescent; leaves short, obovate-oblong, 
sparingly serrate near the summit, or entire, 3-ribbed, mostly very obtuse; scales 
of the involucre obtuse, shorter than the flowers. (E. glaucescens, Ell.) — Rich 
shaded soil, Florida to South Carolina. Sept. — Stem 29-39 high. Leaves l! 
long, pale and somewhat glaucous on both sides. 
5. E. leucolepis, Torr. & Gray. Stem simple, virgate, minutely pubes 
cent and roughened ; leaves somewhat remote, lanceolate or linear-lanceolate, 
acute, serrate, very fogh on both sides, obscurely 3-ribbed ; corymbs ample, 
hoary ; scales of the involucre lanceolate, acuminate, white and scarious at the 
apex, as long as the flowers. — Flat pine barrens, Florida and northward. - Sep 
— Stem 2° high. Leaves 1/—2! long. Au 
6. E. parviflorum, Ell. Tomentose; stem slender, simple or branched 
above; leaves alternate, opposite, or r whorled, lanceolate, Nen strongly serre 
voluere. iiis; obti shorter than the downs, sáról longer than. the 
mature achenia. — Margins of ponds and wet places, Florida to North Carolint» i 
and westward. g — Stem 2? high. Leaves 2’ long, ER veined. pii Ei 
