ORDER LXVI. RUBIACE.E. 345 



1. S. gla'bra, (Mich.) Stein procumbent, glabrous. Leaves lanceo- 

 late. Flowers numerous, in whorls. Calyx 4-toothed ; corolla cam- 

 panulate, funnel-form, -woolly in the throat. — If. S. "Western States. 

 1—2 feet. 



J. S. Chapman'ii, (T. & G.) Stem slightly angled, glabrous, with 

 elevated lines. Leaves oblong-lanceolate, acute, scabrous above. 

 Stipules 5 — 6 bristles. Flowers numerous, axillary ; corolla 3 times as 

 long as the calyx ; stamens exserted. Capsule oblong. — Mid. Flor. 



3. S. ten'uior. Stem erect, glabrous. Leaves lanceolate, scabrous on 

 the upper surface. Flowers verticillate. Stamens included. Seeds 

 hirsute. — Florida. 



4. S. diodi'na, (Mich.) Stem procumbent, terete, sometimes branch- 

 ing, hirsute. Leaves linear-lanceolate, sessile, finely serrulate, hairy, a 

 membranaceous stipule, embracing the base of the leaves, with seta- 

 ceous segmenta Flov:crs axillary, sessile, clustered, or solitary. Ca- 

 lyx 4-leaved. Corolla hairy, with a 4-parted limb. Carpels 2, connate, 

 ciowned with the calyx, each 1-seeded. — White. &. July — Sept. 

 Poor soils. Common. Diodia teres, Walt. 



5. S. involucra'ta, (Pursh.) Stem hirsute. Leaves ovate-lanceolate, 

 acuminate, somewhat oblique; stipules with many setaceous segments. 

 Flowers in terminal heads, surrounded with an involucre ; tube long. 

 — White. 0. June — July. Carolina. 



Genus IV.— DIO'DIA. L. 4—1. 

 (From diodos, a passage ; growing by the way-side.) 



Calyx 2-leaved. Corolla funnel-shaped. Capsule 2-celled, 

 1 seed in each cell. 



1. D. Virginia'na, (L.) Stem glabrous, procumbent, slender, nearly 

 terete, purple, narrow-lanceolate. Corolla glabrous. Fruit oblong, 

 glabrous. — White. 71. May — August. Near Columbia, S. C. 



2. D. tetrago'na, (Walt.) Stem procumbent, creeping, slightly an- 

 gled, hairy at the joints. Leaves opposite, oval, or cordate-ovate, joined 

 by stipules ; stipules with subulate, ciliate segments. Flowers axilla- 

 ry. Calyx 2-leaved, subulate, persistent. Corolla pubescent within. 

 Fruit composed of 2 connate carpels, each containing 1 seed. — White. 

 71. May — Oct. Damp soils, very common. 



3. D. hirsu'ta, (Pursh.) Stem hirsute, slender, procumbent. Leaves 

 narrow-lanceolate, the whole plant hispid. In other respects it resem- 

 bles the preceding species. 



Genus V.— CEPHALAN'THUS. L. 4—1. 

 (From kephale, a head, and antho$, a flower; the flowers in heads.) 



Flowers in globose heads. Calyx superior, small, 4-cleft. 

 Corolla tubular, 4-cleft. Stamens 4. Style exserted. Capsule 

 2-celled, 2-seeded. 



1. C. occidenta'lis, (L.) A shrub, much branched. Leaves opposite 

 and terna'e, ovate-lanceolate, entire, upper surface glabrous, lower pu- 

 bescent on the veins; petioles short, winged. Flowers axillary and 

 terminal ; peduncles pubescent. Corolla hairy within, with 4 obtuse 



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