RUBIACE^E. (MADDER FAMILY.) 175 



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

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

 rivers, Florida and westward. June. ]\. — Stem l°-2° high. 



2. S. Chapmanii, Torr. & Gray. 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 

 westward. July. 1J. — Stem 6' -12' high. 



3. S. tenuior, L. Stem slender, erect or prostrate, branching 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 included ; fruit ovoid, 

 hairy. — South Florida, in dry soil. (l) — Stem 3' - 12' long. 



4. S. involucrata, Pursh. Stem alternately branched, very hispid; leaves 



ovate-lanceolate, acuminate, hirsute on both surfaces ; stipules with many bris- 

 tles ; heads terminal, involucrate ; stamens exserted. — Carolina, Frazer. — 

 About a foot high. Leaves somewhat oblique. Flowers white with a very long 

 tube. Pursh. (*) 



3. BORRERIA, Meyer. 



Carpels of the fruit separating from the apex downward, both opening length- 

 wise on the inner face. Otherwise like Spermacoce, both*in character and habit. 



1. B. micrantha, Torr. & 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 

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

 longer than the minute (white) corolla ; fruit ovoid, hairy. — Waste places, Flor- 

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



2. B. podocephala, DC, var. pumila. Stems low (3'-G'). smooth, 

 erect or ascending, branching at the base ; leaves smooth, linear, with the mar- 

 gins revolute, those in the axils clustered, the floral ones mostly 4, longer than 

 the solitary terminal long-peduncled globose head; stipular bristles 2-4; fruit 

 pubescent, ovoid, crowned with two subulate spreading calyx-lobes ; corolla 

 somewhat funnel-shaped, mostly 3-lobed, smooth within ; stigma capitate. — 

 Pine Key, South Florida, Dr. Blodgett. 



4. DIODIA, L. 



Characters chiefly of Spermacoce, but the two bony indchiscent carpels closed 

 on the inner face. — Herbs. Corolla-tube often long and slender. Flowers few 

 or solitary in the axils of the narrow leaves. 



1. D. Virgmiana, L. Perennial; stem and leaves smooth, pubescent, 

 or hirsute ; stem prostrate, 4-angled ; leaves somewhat fleshy, lanceolate, acute, 

 sessile; flowers single, or 2-6 in a cluster; corolla hairy within, the tube long 



