92 DICOTYLEDONOUS. 



7. L. Mollis. Stem erect, much branched, pubescent. 'Leaves lanceo- 

 late, pubescent, acute at each extremity. Floiaers generally clustered, axilla- 

 ry, sessile, segments of the calyx acuminate, triangular, ovate. Petals min- 

 ute or none. Capsule subglobose, villous, 4-sided. 



Yellow. % July — Sept. In swamps. 2-3 feet. 



8. L. Alata. Stem erect, glabrous, sparingly branched, winged. Leaves 

 cuneate, decurrent at the base, lower ones lanceolate or oval. Flowers ax- 

 illary, solitary, sessile, apetalous ; segments of the calyx broad triangular 

 ovate capsules, cubical slightly winged, small. 



Yellow. %. July— Sept. In swamps. Southern Car. & Geo. 1-3 ft. 



9. L. SpHaeROCARPA. Stem erect, slightly angled, branching, glabrous or 

 minutely pubescent- Leaves linear-lanceolate, acute, attenuate at the base. 

 Flowers axillary- generally solitary, sessile, commonly apetalous ; segments of 

 the calyx, triangular-ovate. Capsule small, globose, pubescent. 



Yellow. %. July— Sept. Swampy grounds. Southern Car. & Geo. 1-2 ft. 



10. L. MicROCARPA. Stem decumbent, slightly winged, branching, gla- 

 brous, ascending. Leaves obovate, spatulate, acute, glabrous ; obscurely 

 denticulate. Flowers minute, axillary, sessile, apetalous. Capsule very 

 small, 4 furrowed. 



<|). Damp places. Lower Car. & Geo. 8-12 inches. 



11. L. Capitata. /S/em erect glabrous, slender, somewhat angled. Leaves 

 narrow-lanceolate, obtuse at the base, sessile acute. Flowers in a crowded 

 terminal head or spike, sessile. Petals small or none ; segments of the calyx, 

 broad triangular-ovate. Capsule ohlons, quadrangular slightly winged. 



Yellow. 1].' Aug —Oct. Damp soils. Middle Geo. 12-15 inches. 



12. L. Palustris. S/em procumbent, glabrous, creeping, branching, suc- 

 culent. Zeaves opposite, ovate-spatulate, entire, tapering at the base into a 

 slender petiole. Flowers axillary sessile ; segments of the calyx very short. 



Red. %• Through the summer. In water. 



13. L. Natans. Stem glabrous, somewhat fleshy, creeping or floating. 

 Leaves opposite, ovate-spatulate, tapering into a petiole, lower ones nearly 

 sessile. Flowers axillary, sessile ; segments of the calyx triangular-ovate ; 

 petals sometimes wanting. Capsule quadrangular, attenuate at the base. 



Yellow. %. July— Oct. In swamps, middle Car. & Geo. 



14. L Peduncdlosa. Stem creeping, radicant, glabrous, branching. 

 Leaves opposite, sessile, lanceolate, entire, upper surface glabrous, the under 

 sprinkled with hairs. Flowers axillary, solitary, on long peduncles. Petals 

 obovate, entire, caducous, segments of the calyx Hnear-lanceolate, acuminate, 

 spreading. Capsule obconic, pubescent. 



Yellow. %. May — June. In wet places. Stem 3-10 inches. 



Genus VI. PROSERPINACA. 



Calyx 3-parted, tube S-sided. Petals none. Stamens 3. 

 Stigmas papillose. Fruit 3-sided, 3-cel!ed. Aquatic herbs. 

 Stems creeping. Leaves alternate. Flowers axillary. 



1. P. Palustris. Root fibrous. Stem herbaceous, procumbent, columnar, 

 branching, glabrous, colored. Leaves sessile, lanceolate, sharply serrate, the 

 lower ones pectinate or pinnatifid dabrous. Flowers 1-3 axillary, nearly 

 sessile ; segments of the calyx lanceolate persistent. Fruit triquetrous. 



%. April. In shallow waters. 



2. P. Pectinata. Stem herbaceous, erect, sometimes branching, angled 

 near the summit. Leaves glabrous, pectinate ; segments linear-subulate. 

 Flowers 1-3, nearly sessile. Nut triquetrous with obtuse angles. 



%. May — April. In shallow water. 2-8 inches. 



