526 ONAGRACEiE. Ludwigia. 



jl. 1. p. 182. I. palustris p. Americana, DC! I. c. I. ascendens, Hall, in 

 Eatoii's man, cd. 8. 



In ditches and small streams, Canada ! (from the Saskatchawan !) 

 and throughout the Northern Sjates ! to Florida, Louisiana, and Oregon ! 

 June-Nov. — Stems purplish, apparently perennial. Flowers very small. 

 Capsules small. Style almost none. Seeds huff-color, oblong; slightly an- 

 gled, shining. 



^4- 14. L. natans (Ell.) : glabrous, somewhat fleshy ; stems creeping or 

 ^I'sometimes floating ; leaves opposite, ovate-spatulare or oblong, tapering into 

 a petiole, tlie lowermost sometimes almost sessile ; flowers axillary, sessile ; 

 petals (yellow, Ell.) as long as the ovate-triangular acute lobes of the calyx, 

 sometimes none ; ovary bibracteolate ; capsules 4-sided, tapering towards 

 the base.— -E//. sk. 1. p. 581. 



In streams or swamps, S. Carolina, Elliolt ! Florida, Dr. Chapman ! 

 Louisiana, Dr. Hale ! July-Oct. — Differs from the preceding in its larger 

 flowers ; the fruit twice or thrice the size, usually with 2 conspicuous bracts, 

 and attenuate from the middle to the base, when young turbinate, at length 

 quadrangular. 



1 5. L. spathulata : finely pubescent throughout, not shining or succulent ; 

 stem branching from the base, ascending ; leaves opposite, oval, tapering 

 into a margined petiole ; flowers axillary, sessile, apetalous ; lobes of the 

 calyx very short ; capsules (small) somewhat ovoid, obscurely 4-sided, 

 pubescent. 



Middle Florida, Dr. Chajyman.'— Stem 8-12 inches high, slender, diffusely 

 branched from the base, ajiparently annual. Leaves about an inch in 

 leno-th, the margined petiole about the length of the limb, cl'clied, like the 

 stems, with a fi^ne appressed slightly hoary pubescence. Flowers very 

 small. Style very short. Seeds fuscous, shining, minutely striate with dark 

 brown lines. 



§ 3. Leaves opposite, sessile : jioxoers on filiform ])eduncles : petals conspicu- 

 ous : capsule clavate-turbinate, the apex croivned with a short conical stylo- 

 podium. — Ludwigiantha. 



16. L. arcuala (Walt.) : glabrous or nearly so; stem creeping; leaves 

 opposite, oblanceolate, sessile ; flowers solitary, on long filiform axillary 

 peduncles; petals obovate (bright yellow), exceeding the linear-lanceolate 

 acuminate spreading lobes of the calyx ; capsules clavate-oblong, at length 

 arcuate, about the le'ngth of the persistent lobes of the calyx. — IValt. Car. p. 

 89. L. pedunculosa,"M;c/ur. / Jl. 1. p. 88 ; Pursh, fl. 1. p. Ill ; Ell. ! sk. 

 1. p. 215. Isnardia pedunculosa, DC. ! prodr. 3. p. 60. 



In bogs and swamps, near the coast, Virginia to Georgia ! and Florida! 

 May-July. — Stem 3-10 inches long, rooting at each pair of leaves, some- 

 times branched. Peduncles twice o"r thrice the length of the leaves, with a 

 pair of setaceous bracteoles near the summit. Flowers large for the size of 

 the plant. — The leaves are marked with translucent linear dots, which are 

 also more or less apparent in most species of this genus, as Avell as in many 

 of CEnothera and Epilobium. 



L glandulosa and L. rudis of Walter cannot be determined by the description 

 given by that author, and no specimens exist in his herbarium. 



L. tuberosa of Rafinesque {ann. nat. p. 15.) appears to be either L. virgata 

 or L. alternifolia. 



