VOI,. II.] 



EVENING-PRIMROSE FAMILY. 



479 



5. Ludwigia linearis Walt. L,inear-leaved I/udwigia. (Fig. 2561.) 



Ludwigia linearis Walt. Fl. Car. 89. 1788. 



Erect, branching, glabrous, i-2>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, I'-a' long, 

 about i" wide, the margins roughish, 

 those of the stolons obovate; flowers 

 axillary, solitary, sessile, about i" 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 //r -4 x/ 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 hirtella Raf. Hairy L/udwigia. 

 (Fig. 2562.) 



Ludwigia hirtella Raf. Med. Rep. (II.) 5: 358. 1808. 



Erect, branching, hirsute-pubescent, i-2 high. 

 Leaves alternate, oblong-lanceolate or ovate-lanceo- 

 late, sessile, obtuse at the apex, rounded at the base, 

 i / -i^ / 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^ // 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 L. Seed- 

 box. Rattle-box. (Fig. 2563.) 



Ludwigia alternifolia L. Sp. PI. 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 / -4j^ / 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^" 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. 



