ORDER L. ONAGRACK^. 315 



Genus IV.— JUSSIJE'A. L. 10—1. 

 (In honor of A. de J-issieu, demonstrator of plants in the Eoyal Garden at Paris.) 



Calyx 4 — 6-parted ; tube prismatic or cylindrical, not ex- 

 tended beyond the ovary. Petals 4 — 6, spreading. Stamens 

 double the number of petals. Capsule 4 — 6-celled, oblong, 

 ribbed. Seeds numerous. Leaves alternate. Flowers axillary. 

 Herbaceous plants, growing in wet places. 



1. J. grandiflo'ra, (Mich.) Root creeping. Stem erect, ascending, 

 little branched, villous when young. Leaves lanceolate, entire, acute 

 at each end, nearly sessile, lower ones spatulate. Flowers solitary, ax- 

 illary, nodding before their expansion. Calyx villous, with very acute 

 segments. Petals obovate, emarginate, double the length of the seg- 

 ments. Stamens 10, unequal. Ovary 5-angled. — Yellow. 2£. May — 

 Aug. Low country. 2 — 3 feet. 



2. J. leptocae'pa, (Nutt.) Stem hirsute, erect, simple or somewhat 

 branched. Leaves lanceolate, almost sessile. Flowers axillary, on short 

 pedicels. Calyx usually with 6 acuminate, hairy lobes. Petals as long 

 as the calyx. Staynens 10 — 12. Capsules linear, nearly glabrous when 

 mature. — Yellow. 0. June — Aug. Southern Geo. 1 — 2 feet. 



3. J. decur'rens, (D. C.) {Ludwigia decurrens of Elliott.) Stem 

 erect, glabrous, branching, winged ; branches slender. Leaves ovate, 

 lanceolate, decurrent, closely sessile, shining, with 2 glands at the base. 

 Flowers on square, winged peduncles, with 2 cordate glands in the 

 middle ; segments of the calyx 4, acuminate, 5-nerved. Petals obovate, 

 as long as the segments, caducous. Stamens 8. Capsules 4-seeded, 

 winged, on short pedicels. — Yellow. If. July — Sept. Damp soils. 

 Very common. 2 — 3 feet. 



Genus V.— LTJDWIG'IA. L, 4—1. 

 (In honor of Professor Ludwig, of Leipsic.) 



Calyx 4-parted ; tube angled or cylindrical. Petals 4 or 

 none. Stamens 4. Apex of the ovary generally flat. Stigma 

 capitate. Capsule quadrangular, 4-celled, many-seeded. Flow- 

 ers axillary or spicate. Perennial plants, growing in wet 

 places. 



1. L. alternifo'lia, (L.) Stem erect, branching, slightly angled, 

 slightly scabrous. Leaves alternate, lanceolate, sessile, tapering at each 

 extremity. Flowers axillary, solitary, on short peduncles ; segments of 

 the calyx ovate, acuminate, spreading, 5-nerved. Petals caducous, as 

 long as the calyx. Capsule with winged angles, cubical ; wings ciliate. 

 — Yellow. U- July — Sept. Low country. 3 — 4 feet. 



2. L. pilo'sa, (Walt.) Stem hairy or hirsute, erect, branching. Leaves 

 ovate, obtuse ; upper ones lanceolate or oblong-linear, sessile, some- 

 what decurrent. Flowers axillary, on short peduncles, large ; seg- 

 ments of the calyx ovate, lanceolate, spreading. Capsule villous, nearly 

 cubical; angles winged. — Yellow. 21. Aug. — Oct. Wet clay soils. 

 1—2 feet 



