EPILOBIACEAE 837 
glabrous, nearly as broad as long, almost as long as the capsule: petals wanting : capsules 
3-4 mm. high, the angles winged. 
In marshes, North Carolina to Missouri, Florida and Louisiana. Spring to fall. 
8. Ludwigia lanceolata Ell. Stems glabrous, erect, 3-7 dm. tall, angled or some- 
times winged. often much branched, sometimes stoloniferous : leaf-blades linear-oblanceolate 
to linear-lanceolate, 2-10 cm. long, acute, entire, sessile, those of the stolons suborbicular 
or spatulate : flowers inconspicuous : sepals glabrous, about 4 as long as the capsule, broader 
than long, acute : petals wanting : capsules cubic-turbinate, about 4-5 mm. high, the angles 
margined, about twice as long as the sepals. 
In swamps, North Carolina to Florida. Summer and fall. 
9. Ludwigia sphaerocárpa Ell. Stems generally finely pubescent, 6-9 dm. high, the 
lower part clothed with aerenehyma when growing in water : leaf-blades variable, those of 
the stem and branches lanceolate, acute at both ends, 5-10 cm. long, scabrous and minutely 
denticulate, sessile, those of the stolons obovate: flowers sessile: sepals triangular, acute : 
aber commonly wanting: capsules globular, about 4 mm. high, scarcely longer than the 
sepals. 
P In swamps, eastern Massachusetts to Florida and Louisiana. Summer and fall. 
10. Ludwigia pilósa Walt. Stems woody, rather densely pilose, erect or assurgent, 
6-12 dm. tall, nearly terete, usually much branched, often stoloniferous : leaf-blades lance- 
olate, oblong or linear-oblong, 1-6 cm. long, acute, sessile or nearly so, those of the branches 
much smaller than those of the stem, those of the stolons more or less spatulate: flowers 
inconspicuous: sepals silky when young, triangular-ovate, acuminate: petals minute or 
wanting : capsules subglobose-cubic, 4-6 mm. in diameter, hoary, sessile. 
In swamps, North Carolina to Florida and Louisiana. Summer and fall. 
11. Ludwigia glandulósa Walt. Stems glabrous, much branched, 3-9 dm. tall: 
leaf-blades oblong-lanceolate, acute at each end, 5-10 mm. long, sessile or short-petioled : 
flowers axillary, rarely 2 together: bractlets at the base of the hypanthium minute or 
wanting : sepals triangular-ovate, acute: petals wanting: capsules 4-grooved, 6-8 mm. 
long, glabrous, 4-5 times as long as the sepals. 
In swamps, Illinois to Kansas, South Carolina, Florida and Texas. Summer and fall. 
12. Ludwigia linifólia Poir. Stems glabrous, erect or assurgent, 1-5 dm. tall, sim- 
le or diffusely branched, often purplish, stoloniferous at the base, 4-angled : leaf-blades 
linear-oblanceolate or linear, 2-6 cm. long, obtuse or acute, sessile or nearly so : flowers 
inconspicuous, sessile: sepals glabrous, lanceolate or ovate-lanceolate, acuminate: petals 
about as long as the sepals: capsules cylindric, 1 cm. long, sessile. 
In pine-land swamps, North Carolina to Florida and Alabama. Spring to fall. 
13. Ludwigia lineàris Walt. Stems glabrous, 3-7.5 dm. high, branching, often 
stoloniferous, the lower part clothed with aerenchyma : leaf-blades narrowly linear, ses- 
sile, acute at each end, 2.5-5 cm. long, about 2 mm. wide, with roughish margins, those 
of the stolons obovate: flowers sessile: sepals triangular-ovate, acute: petals yellowish, 
slightly longer than the sepals: capsules narrowed at the base, 6-8 mm. long, 3-5 times as 
long as the sepals. 
In swamps, New York to Florida and Louisiana. Summer and fall. 
14. Ludwigia hirtélla Raf. Stems hirsute, branching, 3-6 dm. tall: leaf-blades ob- 
long-lanceolate or ovate-lanceolate, 2.5-3 cm. long, obtuse at the apex, rounded at the 
base, sessile: flowers solitary, peduncled : corolla 20-30 mm. broad: sepals ovate-lanceo- 
late, acute : corolla 12-20 mm. broad : petals yellow, longer than the sepals: capsules cubic 
above a rounded base, about 5 mm. high, shorter than the sepals, each opening by an 
apical pore. 
In swamps, mainly in pine lands, New Jersey to Florida and Texas. Spring to fall. 
15. Ludwigia virgata Michx. Stems from more or less thickened tuberous roots, 
slender, puberulent, erect or ascending, 4-13 dm. tall, simple and wand-like or branched 
at the base or above, angled, especially above : leaf-blades variable, the lower ones mostly 
oval or oblong, 1-5 em. long, the upper linear, 2-10 em. long, all obtuse or minutely apicu- 
late, sessile : flowers in elongated interrupted racemes: pedicels 8-15 mm. long: sepals puber- 
ulent, ovate, acute, reflexed: corolla bright yellow, 3-4 cm. broad: petals about twice as 
long as the sepals : capsules globular-cubic, 5-8 mm. long, the angles often slightly winged. 
In dry pine lands, North Carolina to Florida and Louisiana. Spring to fall. 
16. Ludwigia alternifdlia L. Stems glabrous or puberulent, often from tuberous 
roots, branching, 6-12 dm. high: leaf-blades lanceolate, acute or acuminate at the apex, 
5-12 cm. long, short-petioled : flowers short-peduncled, axillary : sepals ovate, acuminate : 
corolla 12-16 mm. broad: petals about equalling the sepals, falling away when the plant 
