146 EVENING-PRIMROSE FAMILY. 



J. graildifl.6ra. Marshes S. : hairy, with 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. % 



J. ripens. In water from S. 111. S. : smooth, with creeping or floating 

 and rooting stems, oblong leaves tapering into a slender petiole, long-pedancled 

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

 tapering at the base. y. 



9. LUDWIGIA, FALSE LOOSESTRIFE. (Named for C. G. Ludvng, 

 a German botanist, rather earlier than Llnnseus.) Marsh herbs, with entire 

 leaves ; flowers seldom handsome, in summer and autumn, y. 



§ 1 . Leaves dUernate, mostly sessile. 



* Flowers pedunded in the upper axils, with yellow petals (about J' lonq) equalling 



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° high. 



L. alteruifdlia. 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. Virg&ita. IPine barrens S. : downy, with mostly simple stems, blunt 

 oblong leaves or the upper linear and smaller, and petals twice the length of the 

 reflexed calyx. 



L. hirtella. Pine-barrens from New Jersey S. : hairy, with simple stems, 

 oblong or lanceolate short and blunt leaves, and jjetals twice as long as the 

 bai'cly spreading calyx-lobes. 



* » Flowers sessile in the u^sgr axils, small, and with pale yellow petals about the 



length of the persiste^^ caliix-lobes : stamens and style short : . leaves on 

 flowering stems narrcrui^tid linear. 



L. linearis. Swamps from Nj.j£rsey S. : smooth, loosely branched, l°-3° 

 high, with acute lea^'es on the flipWf ring stems, but obovatc ones on creeping 

 runners ; pods oblong-clnbshaped or top-sh.iped and much longer than the tri- 

 angular-ovate calyx-lobes. 



L. linifdlia, only S., is 6' -12' high, with blunter leaves, and cylindrical 

 pods little longer than the lanceolate calyji-lobes. 



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



ments : leaves mostly lanceolate, some tpecies with obovate or spatulate leaves 

 on creeping runners : flowering stems moUly 2° -3° high. 

 t- Downy all over: flowers spiked or crowded. at the end of the branches. 



L. pildsa. Only S. : much branched, with lance-oblong leaves, and glob- 

 iilar-4-sided pod about the length of the spreading calyx-lobes. 

 •^ ■<- Smooth or smoothish throughout. 



L. eylindriea. From niinois and N. Car. S. : 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. 



L. sphseroearpa. From E. New England S. : with lanceolate or linear 

 leaves acute at both ends, very small flowers in the axils, and s'-obular pods not 

 logger than the calyx-lobes, with hardlv any bractlets at their base. 



Ii. polyc&rpa. From Michigan S. : like the last, but smoother, and with 

 conspicuous slender bractlets at the base of the 4-sided rather top-shaped ijod, 

 which IS longer than the calyx-lobes. 



L. capit&,ta. From ]Sf. Carolina S. : with slender siraplo stems angled 

 towards the top, long lanceolate leaves ; flowers mostly crowded in an oblong or 

 roundish terminal head, and obtusely 4-angled pod longer than the calyx-lobes. 



Ij. alata. From N. Carolina S. : with simple or sparingly branched stems 

 strongly angled above, few floweikin the axils of the upper wedge-lanceolate 

 leaves, and an inversely pyramidaaod as long as the white calyx-lobes, with 

 concave sides and winged angles. & 



L. microe^pa. From N. Carolina S. ; the low stems creeping at base 

 ana 3-angled above, leaves spatulnte»OT obovate, with minute flowers in their 

 axils, the short 4-angled pods not largH- tlian a pin's head. 



