424 ONAGRACEAE 
Calyx tube not longer than the ovary. 
Seeds without hairs. . . . . . # Judwigia 
Seeds with silky hairs . . . . Chamaenerion 
Calyx tube longer than the ovary. 
Seeds with silky hairs . . . . . Epilobium 
Seeds without hairs. 
Flowers yellow. 
Stamens of equal length. 
Ovules, 2 rows in each of the 4 divisions of 
the ovary lying horizontally and by com- 
pression angled in the long axis . Onagra 
Ovules in 1 row in each of the 4 divisions, 
upright and not angular. Oenothera 
Stamens of unequal length . . . . Koneiffia 
Hlowers pink; 2. = 6 ©.» See 
Petals.and sepals, each 2 6 3s » « 's «% « -s Gira 
1. LUDWIGIA, L. 
Herbs, with alternate leaves and with rather inconspicuous axillary 
flowers. Lobes of the calyx 4, adherent to the ovary but not prolonged 
beyond it. Petals 4, often wanting; stamens 4 inserted into the petals. 
Ovary 4- or 5-celled. Capsule short or cylindrical, winged or ribbed. 
Seeds very small. 
Capsules nearly globe-formed. 
Flowers small, without flower stalks, in the leaf-axils, with small greenish 
petals or none. 
Bractlets at base of capsule very small or none . . JL. sphaerocarpa 
Bractlets at base of capsule as sa as Ceerad - « « JL. polycarpa 
Capsules much longer than broad . . . . a ‘er «alt, 8) fen cc en am 
Flowers showy. 
Plant hairy . ay) server pete te mice: gece pbs) 2 Cre oo boca! heh aE ame 
Plant’ not thairy 0% <\ es eye ie Ue) ys we | dee «Me rernanaiae 
1. L. sphaerocarpa, Ell. (Fig. 10, pl. 103.) Gtope-rrurrep Lup- 
WIGIA. Plant growing in swampy or wet places, 2 to 3 ft. high. Leaves 
.lance-shaped or linear, some leaves with very small teeth at borders, 
alternate, 2 to 4 in. long. Whole plant or at least upper part of it finely 
downy. Bractlets at base of flowers minute or absent. Capsules globular. 
Petals very minute or none. Calyx 4-parted, generally shorter than the 
capsule. Swamps, eastern Mass., southern New York and southward. 
July-Sept. 
2. L. polycarpa, Short and Peter. (Fig. 9, pl. 103.) MANyY-FRUITED 
Lupwicta. Plant growing in swamps, 1 to 3 ft. high, with runners at 
base. Leaves narrowly lanceolate, borders not toothed, acute at each 
end, without leaf-stalk, 2 to 4 in. long. Leaves of the runners spatula- 
formed. Bractlets at base of flowers linear and conspicuous. Wet places. 
July-Oct. 
3. L. linearis, Walt. Lryear-Leavep Lupwicts. Plant, 1 to 2 ft. 
