588 



ONAGRACEAE. 



Vol. II. 



5. Ludwigia linearis Walt. Linear-leaved Ludwigia. Fig. 3020. 



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



Erect, branching, glabrous, l°-2i° high, 

 often stoloniferous at the base and the 

 lower part of the stem clothed with aeren- 

 chyma. Leaves alternate, those of the stem 

 and branches narrowly linear, sessile, acute 

 at each end, i'-2' long, about l" wide, the 

 margins roughish, those of the stolons obc- 

 vate; 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 yel- 

 lowish petals ; capsule narrowly obpyram- 

 idal, 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 Jersey to 

 Florida, west to Texas. July-Sept. 



6. Ludwigia hirtella Raf. Hairy Ludwigia. 

 Fig. 3021. 



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



Erect, branching, hirsute-pubescent, i°-2° high, the 

 clustered roots spindle-shaped. Leaves alternate, 

 oblong-lanceolate or ovate-lanceolate, sessile, obtuse or 

 acutish at the apex, rounded at the base, I'-li' long; 

 pedicels 2-bracteolate; flowers axillary, solitary, pedun- 

 cled, 6"-io" broad ; calyx-lobes ovate-lanceolate, acute, 

 somewhat shorter than the yellow petals ; capsules cubic 

 with a rounded base, hirsute, about 2i" high, shorter 

 than the calyx-lobes, opening by an apical pore. 



In swamps, pine-barrens of New Jersey to Florida, 

 Arkansas and Texas. June-Sept. 



7. Ludwigia alternifolia L. Seed-box. Rattle-box 



Ludivigia aUernifolia L. Sp. PI. 118. 1753. 



Ludwigia alternifolia linearifolia Britton, Bull. Torr. 

 Club 17 ; 315. 1890. 



Erect, branching, glabrous or finely pubescent, 

 2°-3i° high. Leaves alternate, short-petioled, 

 lanceolate to linear-lanceolate, acute or acumi- 

 nate at the apex, narrowed at the base, 2-4} 

 long ; flowers axillary, short peduncled, solitary, 

 6"-8" broad ; peduncles 2-bracted above the 

 middle ; calyx-lobes ovate to ovate-lanceolate, 

 acuminate, about equalling the yellow petals 

 which fall away when the plant is shocked; cap- 

 sules glabrous, cubic with a rounded base, 

 slightly wing-angled, about 2V high, opening by 

 a pore at the base of the style and finally loculi- 

 cidally dehiscent. 



In swamps. New Hampshire to northern New 

 York, Ontario, Michigan, Kansas, Florida and Texas. 

 Roots often tuberous. June-Sept. 



