836 EPILOBIACEAE 
Fruit glabrous, the angles rounded : bractlets adnate to the 
hypanthium. 5. L. polycarpa. 
Fruit puberulent, the angles square : bractlets not adnate 
to the hypanthium. 6. L. simulata. 
£e Fruit a broader than long, the angles winged or mar- 
ined. 
Sepals nearly as broad as long. almost as long as the capsule: 
seeds oval. : . 7. L. alata. 
Sepals broader than long, 14 as long as the capsule: seeds 
cylindric. 8. L. lanceolata, 
Fruit globular. 9. L. sphaerocarpa. 
** Foliage and fruit copiously pilose-tomentose. 10. L. pilosa. 
b. Capsules cylindric. 11. L. glandulosa. 
B. Petals longer than the sepals. 
Fruit cylindric, terete or nearly so. 12. L. linifolia. 
Fruit narrowly obpyramidal. 13. L. linearis. 
Corolla conspicuous : flowers peduncled : capsule opening by a terminal pore. 
Foliage, sepals and fruit hirsute. 14. L. hirtella. 
Foliage, sepalsand fruit glabrous, puberulent or minutely appressed-pubescent. 
Stem-leaves with closely sessile blades: petals about twice as long as the 
sepals: pedicels longer than the capsules. 15. L. virgata. 
Stem-leaves with short-petioled blades: petals about as long as the sepals : 
pedicels shorter than the capsules. 16. L. alternifolia. 
1. Ludwigia microcárpa Michx. Stems slender, glabrous, erect or decumbent and 
creeping, 1-4 dm. long, 3-angled, simple or much branched, often stoloniferous, the angles 
sometimes slightly winged : leaf-blades spatulate or obovate-spatulate, 0.5-3 cm. long, acute 
or obtuse, short-petioled : leaves of the stolons with orbicular blades : flowers inconspicuous, 
axillary, sessile: sepals triangular, acute: petals wanting: capsules broadly obpyramidal, 
1.5-2 mm. long. 
In muddy places, North Carolina to Florida and Mississippi. Spring to fall. 
2. Ludwigia Simpsdnii Chapm. Stems often branched near the base, the branches 
glabrous, simple or again branched, often slightly decumbent, 1-3 dm. long: leaf-blades 
broadly spatulate, 1-2.5 cm. long, finely toothed near the apex : leaves of the stolons with 
very broadly spatulate blades: flowers inconspicuous, axillary, sessile: sepals triangular, 
much shorter than the hypanthium: petals wanting : capsules broadly turbinate, about 2 
mm. long, depressed. 
In ditches and low grounds, western peninsular Florida. Spring to fall. 
3. Ludwigia Curtissii Chapm. Stems glabrous, erect, 2-5 dm. tall, simple or 
branched, especially above, nearly terete, often spongy below: leaf-blades narrowly spatu- 
late, acute, toothed above, narrowed at the base, sessile: flowers inconspicuous, axillary, 
sessile: sepals glabrous, about as long as the hypanthium, triangular: petals wanting: 
capsules turbinate, about 2 mm. long, terete. 
In ponds, eastern peninsular Florida. Summer and fall. 
4. Ludwigia suffruticdsa Walt. Stems glabrous or rarely puberulent, 3-10 dm. tall, 
erect or decumbent, simple and virgate or virgately branched : leaf-blades narrowly oblong 
to narrowly lanceolate or linear, 2-10 cm. long, acute or acuminate, sessile, those of the 
stolons broadly oblong to obovate, short-petioled : flowers inconspicuous, crowded into a ter- 
minal head or congested panicle: sepals broadly ovate or triangular-ovate, acute: pe 
minute or wanting: capsules broadly obpyramidal, 4-5 mm. long, longer than the per- 
sistent sepals. 
In wet pine lands, North Carolina to Florida. Spring to fall. 
5. Ludwigia polycárpa Short & Peter. Stems glabrous, erect or nearly so, 3-9 dm. 
tall, more or less winged : leaf-blades narrowly lanceolate, acute at each end, 5-10 cm. long, 
rough-margined, sessile, those of the stolons spatulate : flowers inconspicuous, sessile : bract- 
lets adnate to the hypanthium : sepals triangular-lanceolate, acute, sometimes serrulate, 
much shorter than the mature hypanthium : petals minute, greenish : capsules glabrous, 
slightly 4-sided, about 5 mm. high, often twice the length of the sepals. 
In swamps, Ontario to Minnesota, Massachusetts, Tennessee and Nebraska. Summer and fall. 
6. Ludwigia simulàta Small. Stems puberulent, freely branching, 4-9 dm. a 
nearly terete: leaf-blades narrowly elliptic to almost linear, 1.5—5.5 cm. long, acute at "is 
ends, entire, sessile, those of the stolons obovate to suborbicular: bractlets not adnate ? 
the hypanthium : sepals triangular or ovate-triangular, about as long as the mature hypan 
eias : petals minute: capsules puberulent, obpyramidal, manifestly 4-sided, about 4 mm. 
ong. 
In swamps, eastern North Carolina. Spring to fall. 
.. 7. Ludwigia alata Ell. Stems glabrous, 3-9 dm. tall, narrowly winged, often stolon 
iferous : leaf-blades linear-oblanceolate to linear-lanceolate, or sometimes nearly linear, ^ 
10 cm. long, those of the stolons suborbicular or spatulate: flowers inconspicuous : sep 
