RUBIACE.E. (madder FAMILY.) 193 



9. G. asprellum, Michx. Stem weak, 2° - 4° long, diffusely branched, 

 retrorsely hi.spid ; leaves 6 in a whorl, lanceolate or elliptical, hispid on the 

 midrib aud margins ; flowers very numerous, minute, white. — Mountains of 

 North Carolina. July. 



10. G. latifolium, Michx. Stems erect, smooth ; leaves thin, 4 iu a 

 whorl, ovate-lanceolate, acute, smooth, 3-nerved, dotted, minutely fringed on 

 the margins; peduncles filiform, 2-3 times forking. — Mountains of North 

 Carolina, and northward. July. — Stems 1° - li° high. Leaves V -2' long. 

 Flowers purple. 



11. G. Arkansanum, Gray. Stems low, smooth; leaves 4 in a whorl, 

 lanceolate or linear, 1' or less long, ciliate on the margins ; peduncles forking. 

 — West Tennessee (Gattinger), and westward. 



2. SPERMACOCE, L. 



Calyx 2-4-parted, persistent. Corolla salver-shaped or funnel-shaped, 4- 

 lobed, valvate in the bud. Stamens 4, inserted on the throat of the corolla. 

 Stigma simple or 2-cleft. Fruit composed of two 1 -seeded carpels. Seeds 

 grooved on the inner face. — Low herbs. Leaves obliquely straight-veined, 

 their bases connected by the bristly-fringed sheathing stipules. Flowers 

 small, in axillary sessile clusters. 



« Carpels separating at the apex, one of them closed by the partition, the other 

 open. — Spermacoce. 



1. S. glabra, Michx. Stem 4-angled, smooth, erect ; leaves lanceolate or 

 oblong, acute, roughened on the margins and veins beneath ; clusters globose, 

 dense, many-flowered ; corolla barely longer than the lanceolate calyx teeth, 

 white, woolly withiu ; stamens and style included; fruit obovate. — Banks of 

 rivers, Florida, and westward. June. % — Stem 1°- 2° high. 



2. S. tenuior, L. Stem erect, smooth, slightly angled ; leaves oblong- 

 lanceolate, acute, rough above and on the margins ; clusters few-flowered ; 

 corolla white, hairy within, 2- 3' times as long as the calyx; stamens and 

 slender style exserted ; fruit turbinate. — Dry soil, Florida, Georgia, and 

 we.stward. July. % — Stem 6' - 12' high. 



3. S- Portorieensis, Balbis. Stem slender, erect or prostrate, branch- 

 ing from the base, terete, smooth ; leaves lanceolate, rough above, remote ; 

 clusters small, mostly few-flowered ; flowers minute, the smooth white corolla 

 barely longer than the subulate teeth of the calyx ; stamens and style in- 

 cluded ; fruit ovoid, hairy. — South Florida, in dry soil. (T) — Stem 3' - 12' 

 long. 



* * Carpels both opening on the inner face. — Borreria. 



4. S. parviflora, Gray. Annual ; stem erect, slender, simple or branched 

 above, 4-angled, smooth ; leaves remote, lanceolate, mostly obtuse, narrowed 

 at the base, the upper surface and margins rough, the lateral veins oliscure ; 

 clusters dense, globose, axillary and terminal ; calyx teeth 4, subulate, longer 

 than the minute (white) corolla ; fruit ovoid, hairy. — "Waste places, Florida. 

 June - August. — Plant 6' - 18' high, pale green. Leaves 1' long. 



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