194 RUBIACE2E. (MADDER FAMILY.) 



5. S. podocephala, Gray. Stems low (3'- 6'), smooth, erect or ascend- 

 ing, branching at the base; leaves smooth, linear, with the margins re volute, 

 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 (Bloilyett). 



3. KICHARDIA, L. FALSE IPECAC. 



Calyx 4 - 7 -parted, the lobes deciduous. Corolla funnel-shaped, 3 - 6-lobed. 

 Stamens 3-6, exserted. Style 3- or 4-cleft. Capsule separating into 2-4 

 one-seeded indehiscent nutlets. Hairy branching herbs. Leaves united by 

 bristly stipules. Flowers white, in terminal sessile clusters. 



1. R. scabra, St. Hilaire. Annual, hirsute, forking; leaves ovate, acute, 

 the two upper pairs involucre-like ; calyx lobes subulate ; nutlets 2-3, oblong. 

 Alabama, Georgia, and Florida. Introduced. 



4. DIODIA, L. 



Characters chiefly of Spermacoce, hut the two bony indehisceut 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. Virginica, 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 and slender; fruit ovoid, strongly ribbed, crowned with the 2 (rarely 4) 

 linear or lanceolate calyx teeth. Wet places. June -Sept. Stem l-4 

 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 

 solitary or 2 - 3 together ; corolla funnel-shaped ; fruit ohovate, even, crowned 

 with the 4 short calyx teeth. Dry sandy soil. July -Sept. Stem 6'- 12' 

 high, sometimes prostrate. Flowers purplish. 



5. CEPHALANTHUS, L. BUTTON-BUSH. 



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. Al- 

 bumen horny. Aquatic shrubs, with oval or lanceolate leaves, short entire 

 stipules, and white flowers collected into a globose long-peduncled head. 

 Receptacle hairy. 



1. C. OCcidentalis, L. Smooth, or the young branches and lower sur- 

 face of the ovate-oblong acute leaves pubescent ; peduncles terminal, and 

 in the upper axils. Ponds and marshes. July- August. Stem 4 -12 

 high. Leaves petioled, 3' -5' long, sometimes three in a whorl. Heads 1' in 

 diameter. 





