E56 RUBIACEX. (MADDER FAMILY.) 
p: 
and slender; fruit ovoid, strongly ribbed, crowned with the 2 (rarely 4) linear 
or lanceolate calyx-teeth. (D. tetragona, Walt. D. hirsuta, Pursh.) — Wet — 
places, Florida to North Carolina, and westward. June — Sept. — Stem 19-49 — 
long. Flowers white or purplish. 
2. D. teres, Walt. Annual; stem erect, widely branched from the base 
terete, bristly or hairy; leaves linear or lanceolate, acute, rough ; flowers soli- 
tary or 2-3 together; corolla funnel-shaped ; fruit obovate, even, crowned with 
the 4 short calyx-teeth. (Spermacoce diodina, Michx.) — Dry sandy soil, Flor- 
, ida to Mississippi, and northward. July- Sept. — Stem 6/-12' high, some- 
times prostrate. Flowers purplish. 
5. ERNODEA, Swartz. 
Calyx ovate; the limb 4 —6-parted, persistent. Corolla salver-shaped, slender; — 
the lobes. 4-6, revolute. Stamens exserted; anthers linear, erect. Style slen- — 
der, longer than the stamens. Fruit obovate, somewhat fleshy, the two separa- — 
ble horny carpels closed. Seeds furrowed on the inner face. — A somewhat —— 
shrubby prostrate and smooth plant, with rigid S-nerved lanceolate leaves, and 
solitary sessile axillary flowers. 
1. E. littoralis, Swartz.— South Florida, along the coast. March and — 
April. — Stems straight, rigid, 4-angled, smooth. Branches short, alternate: — 
Leaves sessile, smooth, acute, the upper ones crowded. Flowers sessile in m l 
upper axils, yellow. Fruit roundish. 8 
6. CEPHALANTHUS, L. Burron-Busz. 
. Calyx obconical, 4-toothed. Corolla tubular, 4-cleft, imbricated in the bud — — 
Stamens 4. Style slender, exserted. Stigma capitate. Fruit dry, obconical, —— 
separating from the base into 2—4 one-seeded carpels. Seeds pendulous. Albu- 
men horny. — Aquatic shrubs, with oval or lanceolate leaves, short entire sti- 
pules, and white flowers collected into a globose long-peduncled head. Recep- 
-tacle hairy. 
1. C. occidentalis, L. Smooth, or the young branches and lower E. a 
face of the ovate-oblong acute leaves pubescent; peduncles terminal, and in the ee 
upper axils, — Ponds and marshes, Florida, and northward. July and August 
— Stem 4? —12? high. Leaves petioled, 3'-5' long, sometimes 3 in 2 
Heads 1' in Vip, 
i | MITCHELLA, L. 
: Siers by pairs, with their ovaries ‘united. Calyx 4-toothed. Corotls fan- 7 
iie ipe: » *lobed, hairy within, valvate in the bud. Stamens 4. nee slen- : 
