194 RUBIACEiE. (mAPPKU KAMILY.) 



f). S. podoccphala, (iray. Stems low (.T- 6'), smooth, erect or aj^cenil- 

 ing, Itraiuliiii^ ai llie liase; leaves smootli, liiuiar, witli tlu' iiiargiiiH revoliite, 

 those ill the axils clustered, the floral <iiies mostly 4, longer tiiau the solitary 

 terminal long-petluiuleil gloliose head; stipular hristles 2-4 ; fruit pulieseent, 

 ovoid, crowned with two suhulate spreading calyx lohes ; corolla somewhat 

 funnel-shaped, mostly 3-lol)ed, smooth within ; stigma ca])itate. — I'ine Kev, 

 South Florida ( Bluihjett). 



3. EICHARDIA, L. False Ii>ecac. 



Calyx 4 - "-parted, the lobes deciduous. Corolla funnel-shaped, 3 - 6-lol)ed. 

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

 one-seeded iudehisceut nutlets. — Hairy branching herbs. Leaves united by 

 bristly .stij)ulos. Flowers white, in terminal sessile clusters. 



1. H. scabra, St. Ililaire. Annual, hirsute, forking; leaves ovate, acute, 

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

 — Alabama, Georgia, and Florida. Introduced. 



4. DIODIA, L. 



Characters chiefly of Spermacoce, but the two bony indeliiscent car|)els 

 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-G in a cluster; corolla hairy within, the tube 

 long anil slender; frnit ovoid, strongly ribbed, crowned with the 2 (rarely 4) 

 linear or lanceolate calyx teeth. — Wet places. Juue-Sept. — Stem l°-4° 

 long. Flowers white or purplish. 



2. D. teres, Walt. Animal ; stem erect, widely branched from the base, 

 terete, l)ristly or hairy ; leaves linear or lanceolate, acute, rough ; flowers 

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

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

 high, sometimes prostrate. Flowers purjilish. 



5. CEPHALANTHUS, L. Button-Bush. 



Calyx obconical, 4toothed. Corolla tulnilar, 4-cleft, imbricated in the bud. 

 Stamens 4. Style slender, ex.'serted. Stigma ca])itate. 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 globo.se long-pedunded 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. 



