222 DICOTYLEDONOUS. 



5 H Serpyllifolia. Stem procumbent, cespitose, filiform. Leaves 

 spatulate, obtuse. Flowers on terminal peduncles, each 1-flowered. 



6 H RoTUNDiFOLiA. iS/em prostrate, rootlng at the joints, glabrous. Leaves 

 ovate, narrowed at the base, slightly ciliate. Flou-ers on axillary peduncles, 

 each one flowered. Corolla salver form, pubescent within ; tube long ; seg- 

 ments lanceolate. Capsule emarginate. 



White. % Through the summer. On the sea coast. 



Gexxus VI POLYPREMUM. 



CaJyx 4-parted, persistent. Corolla rotate, 4.cleft, with the 

 throat hairy. Stamens 4, very short. Style 1, slender. Cap. 

 sule compressed, 2-celled. 



1 P PRocrMBENs. Stem procumbent, furrov^-ed, dichotomously branched. 



Leaves sessile, linear, opposite, connected by a stipular membrane. Flowers 



terminal, and in the divisions of the branches sessile, 2-4 leafy bracts at the 



base of the calyx; segments of the calyx subulate, serrulate See^Z angular- 



White % May — Sept. Very common. 6-12 inches. 



Genus VII VILi^ARSIA. 



Calyx 5-parted. Corolla rotate, with the Hmb 5-parted, 

 ciliate. Stamens 5. Style 1. S/i^w?« 2.1obed, glands 5, al- 

 ternating with the stamens. Capsule 1- celled, 2-valved, 

 many seeded. 



1 V Lacunosa. Stem filiform, floating. Leaves reniform, lacunose be- 

 neath, slightly crenate, on long petioles. Flowers somewhat umbelate, aris- 

 ing from the petioles. 



White. '21- July — August. In still waters. 



Genus VIII OBOLARIA. 



Calyx 2-parted, in the form of bracts. Corolla campanu- 

 late, 4-cleft ; segments equal, entire or crenulate. Stamens 4, 

 somewhat didynamous. Stigma 2-cleft. Capsule 1 -celled, 

 2-valved, many seeded. 



I O ViRGiNiCA. Siem cespitose, simple, or sparingly branched, glabrous. 

 Leaves opposite, sessile, obovate, slightly decurrent, glabrous. Flowers 2-3 

 on the summit of axillary branches. 



White or red. %-. April — May. In rich soils. 4-6 inches. 



Order LXXXVIL SPIGELIACE^. 



Calyx 5-parted. Corolla hypogynous, tubular 5-lobed. — 

 Stamens 5, inserted into the corolla. Ovary superior, 2.celled. 

 Style articulated. Stigma simple. Fruit capsular, 2-celled, 

 2-valved, dehiscing elastically. PlacentcB central. Alhu- 

 men abundant. Embryo minute. Herbaceous plants with 

 opposite entire leaves. Flowers in secund spikes. 



Genus I. SPIGELIA. 



Genus same as the Order. 



