182 EVENING PRIMROSE FAMILY. 



the pods with downy-tufted seeds resembling those of Epilobium, but the 

 handsome scarlet flowers more like those of a Fuchsia ; these are single 

 and sessile in the axils of the jipper and alternate leaves, or at length 

 somewhat racemed, about 2' long. 



3. JUSSL3JA. (Named for Bernard de Jussieu.') Leaves entire. 

 Flowers yellow and axillary, all summer. 2Z 



J. decilrrens, DC. Wet grounds, Va. to 111. and S. Erect stems 

 and slender branches margined or winged in lines proceeding from the 

 bases of the lanceolate leaves, smooth throughout ; flowers sessile or 

 short-stalked, with 4 lobes of calyx nearly as long as the petals, and 

 oblong-club-shaped 4-angled pod. 



J. ripens, Linn. Smooth, with creeping or floating and rooting stems, 

 oblong leaves tapering into a slender petiole ; long-peduncled flowers 

 1' or more across, with 5 calyx lobes, the cylindrical or club-shaped pods 

 tapering at the base. In water from S. 111. S. 



Var. grandifldra, Michl. Marshes S. ; has hairy stems erect from 

 a creeping base ; lanceolate acute leaves ; flowers 2' in diameter, the 

 5 calyx lobes only half as long as the petals, and pods cylindrical and 

 stalked. 



4. LUDWIGIA, FALSE LOOSESTRIFE. (Named for G. G. Ludwig, 

 an early German botanist.) Small marsh herbs, with entire leaves; 

 flowers seldom handsome, in summer and autumn. ^J 



1. Leaves alternate, mostly sessile. 



* Flowers peduncled in the upper axils, with yellow petals (about $' long), 

 equaling the leaf-like ovate or lance-ovate calyx lobes; stamens and 

 styles slender; pod cubical, strongly 4-angled, opening by a hole at the 

 top ; stems 2-3 long. 



L. alternifdlia, Linn. SEEDBOX. Common E., the only one found 

 far N. ; smoothish, branching, with lanceolate leaves tapering to both 

 ends; petals scarcely longer than calyx, and angles of pod wing- 

 margined. 



L. virgata, Michx. Downy, with mostly simple stems ; blunt, oblong 

 leaves or the upper linear and smaller ; and petals twice the length of the 

 reflexed calyx. Pine barrens S. 



L. hirte'lla. Raf. Hairy, with simple stems ; oblong or lanceolate, 

 short and blunt leaves ; and petals twice as long as the barely spreading 

 calyx lobes. Pine barrens from N. J. S. 



* * Flowers sessile in the upper axils, small, and icith pale yellow petals 

 about the length of the persistent calyx lobes ; stamens and style short ; 

 leaves on flowering stems narrow and linear. 



L. linearis, Walt. Smooth, loosely branched, l-3 high, with acute 

 leaves on the flowering stems, but obovate ones on creeping runners ; 

 pods oblong-club-shaped or top-shaped, and much longer than the trian- 

 gular-ovate calyx lobes. Swamps from N. J. S. 



* * * Flowers sessile, often clustered, and with no petals, or rarely mere 

 rudiments ; leaves mostly lanceolate, some species with obovate or spat- 

 ulate leaves on creeping runners ; flowering stems mostly 2-3 long ; 

 smooth or smoothish throughout. 



L. cylindrica, Ell. Much branched, with long, lanceolate, and acute 

 leaves tapering into a petiole; small axillary flowers, and cylindrical 

 pods much longer than the small calyx lobes. 111. and N. Car. S. 

 and W. 



