ONAGRACEAE. [VOL- II. 



a. Ludwigia polycarpa Short & Peter. Many-fruited Ludwigia. (Fig. 2558.) 



Ludicigia polycarpa Short. & Peter, Translv. 

 Journ. Med. 8: 581. 1835. 



Erect, glabrous, branching, i-3 high, pro- 

 ducing stolons from the base. Leaves alternate, 

 sessile, narrowly lanceolate, acute at each end, 

 2'-4' long, rough- margined, those of the stolons 

 broader and spatulate; bractlets at base of the 

 calyx linear, \W-i" long, usually persistent; 

 flowers sessile, about l%" broad, greenish; 

 calyx-lobes triangular-lanceolate, acute, some- 

 times finely serrulate; petals minute, greenish; 

 capsule glabrous, somewhat top-shaped but 

 slightly 4-sided, about 2#" high, often twice 

 the length of the calyx-lobes, glabrous, at 

 length dehiscent 



In swamps, Ontario to Massachusetts and Min- 

 nesota, south to Kentucky and Nebraska. July - 

 Oct. 



3. Ludwigia glanduldsa Walt. Cylindric-fruited Ludwigia. (Fig. 2559.) 



Ludit-igia glandnlosa Walt. Fl. Car. 88. 1788- 

 fttssiaea brachycarpa Lam. Encycl. 3: 331- 



1789. 

 Ludiuigia cylindrica Ell. Bot. S. C. & Ga. i: 



213. 1817. 



Erect, glabrous, much branched, i-3 

 high. Leaves alternate, sessile or narrowed 

 into a short petiole, oblong-lanceolate, acute 

 at each end, 2 / -4 / long; flowers axillary, 

 solitary, or rarely 2 together, greenish, about 

 i" broad; bractlets at base of calyx minute 

 or none; calyx-lobes triangular-ovate, acute; 

 petals none: capsule cylindric, 4-grooved, 

 3"-4" long, glabrous, 4-5 times as long as 

 the calyx-lobes, at length dehiscent. 



In swamps, southern Illinois and Missouri to 

 Texas, east to Florida and South Carolina. 

 July-Sept. 



4. Ludwigia alata Ell. Wing-stemmed 

 Ludwigia. (Fig. 2560.) 



Ludu'igia alata EH. Bot. S. C. & Ga. i: 212. 1817. 



Perennial, slender, glabrous. Stems erect, i-3 

 tall, simple or branched, winged, often stolonifer- 

 ous; leaves linear-oblanceolate to linear-lanceolate, 

 or sometimes nearly linear, i'-4' long, acute or 

 acutish, sessile or short-petioled, those of the sto- 

 lons suborbicular or spatulate; flowers inconspicu- 

 ous, about 2" broad, white or greenish; spikes 2'- 

 I2 / long; calyx glabrous, its tube turbinate, its seg- 

 ments triangular- ovate, acute or acuminate; petals 

 none; capsules broadly obpyramidal, i #"-2" high, 

 sessile, the angles winged; seeds oval in outline, 

 about %" long, faintly pitted. 



In marshes, North Carolina to Missouri, south_to 

 Florida and Louisiana. June-Sept. 



