Vor. I1.] EVENING-PRIMROSE FAMILY. 479 
5. Ludwigia linearis Walt. Linear-leaved Ludwigia. (Fig. 2561.) 
Ludwigia linearis Walt. F1. Car. 89. 1788. 
Erect, branching, glabrous, 1°-2%° 
high, often stoloniferous at the base and 
the lower part of the stem clothed with 
aerenchyma. Leaves alternate, those of 
the stem and branches narrowly linear, 
sessile, acute at each end, 1I/-2’ long, 
about 1// wide, the margins roughish, 
those of the stolons obovate; flowers 
axillary, solitary, sessile, about 2’” broad; 
bractlets at the base of the calyx minute 
or none; calyx-lobes triangular-ovate, 
acute, slightly shorter than the yellowish 
petals; capsule narrowly obpyramidal, 4- 
sided, narrowed at the base, 3//-4/’ long, 
glabrous, 3-5 times as long as the calyx- 
lobes, several times longer than broad, 
at length dehiscent. 
In swamps, pine-barrens of New York to Florida, west to Louisiana. July-Sept. 
6. Ludwigia hirtélla Raf. Hairy Ludwigia. 
(Fig. 2562.) 
Ludwigia hirtella Raf. Med. Rep. (II.) 5: 358. 1808. 
Erect, branching, hirsute-pubescent, 1°-2° high. 
Leaves alternate, oblong-lanceolate or ovate-lanceo- 
late, sessile, obtuse at the apex, rounded at the base, 
1/-114/ long; pedicels 2-bracteolate; flowers axillary, 
solitary, peduncled, 6’/-10’’ broad; calyx-lobes ovate- 
lanceolate, acute, somewhat shorter than the yellow 
petals; capsules cubic with a rounded base, hirsute, 
about 2!4’/ high, shorter than the calyx-lobes, open- 
ing by an apical pore. 
In swamps, pine-barrens of New Jersey to Florida, west 
to Texas. June-Sept. 
{ 
7. Ludwigia alternifolia IL. Seed- 
box. Rattle-box. (Fig. 2563.) 
Ludwigia alternifolia \,. Sp. Pl. 118. 1753. 
Erect, branching, glabrous or finely pubes- 
cent, 2°-3%° high. Leaves alternate, short- 
petioled, lanceolate, acute or acuminate at the 
apex, narrowed at the base, 2’-414’ long; flow- 
ers axillary, short peduncled, solitary, 6’/-8’’ 
broad; peduncles 2-bracted above the middle; 
calyx-lobes ovate, acuminate, about equalling 
the yellow petals which fall away when the 
plant is shocked; capsules glabrous, cubic 
with a rounded base, slightly wing-angled, 
about 2'4’’ high, opening by a pore at the base 
of the style and finally loculicidally dehiscent. 
In swamps, Massachusetts to northern New York, Ontario (?) and Michigan, south to Florida, 
Kansas and Texas. Roots often tuberous. June-Sept. 
Ludwigia alternifolia linearifolia Britton, Bull, Torr, Club, 17: 315. 1890. 
Leaves linear, elongated; calyx-lobes linear-lanceolate; petals more persistent. West Virginia. 
