31 C OllDEK XLVII. LYTHRACEiE 



2. Calyx 6-toothed, ventricose Cuphea, 



Calyx -with less than 6 teeth, not ventricose 3 



3. Calyx 4— 6 teeth, cylindrical Lythrum, 3 



Calyx cainpanulate 4 



4 Calyx 4-lobed Ammannia, 2 



Calyx with 5 teeth Decodun, 4 



Genus L— HYPOBRICH'IA. Peplis, 4—1. 



Calyx 4-lobed and sometimes with intermediate segments, 

 campanulate, apetalous. Stamens 2 — 4. Ovary 2-celled, g-lo- 

 bose. Stigma 2-lobed, nearly sessile. Capsule 2-celled, mem- 

 branaceous, dehiscing irregularly. Seeds numerous. Flowers 

 minute, axillary. An aquatic plant, with opposite, linear 

 leaves. 



1. H. NuTTAL'Ln, (L.) Stems leafy, immersed. Leaves numerous, 

 linear, acute, the uppermost shorter and broader, obtuse. Flowers very 

 small. Stamens 2 — i, shorter than the calyx. — ©. July — Aug. In 

 still waters. 12 — 20 inches. Water Purslane. 



Genus II.— AilMAN'NIA. Houst. 4—1. 

 (In honor of John Auimann.) 



Calyx 4-lobed, with 4 intermediate lobes produced in the 

 sinuses. Petals 4 or none. Stamens generally 4, sometimes 

 8. Ovary 2 — 4-celled. Capsule included in the calyx. Seeds 

 numerous. Stems square ; leaves opposite. Flovjers axillary, 

 w^ith small petals. Herbaceous, annual plants. Growing in 

 wet places. 



1. A. latifo'lia, (L.) Stem erect, branching. Leaves linear, lanceo- 

 late, dilated at the base, sessile. Flowers 1 — 5 in each axil. Calyx 

 angled, with 4 short, intermediate lobes. Petals 4. Stamens 4. Cap- 

 sule 4-celied. — Purple. 0. July — Aug. Near Macon. 10-^20 in. 



2. A. EAMos'iOR, (Mich.) Stem erect, somewhat columnar, succulent, 

 glabrous. Leaves nearly sessile, narrow, lanceolate, more or less cor- 

 date. Flowers axillary, the lower ones several in each axil, the upper 

 solitary. Petals small. Stamens 4. Capsule globose, furrowed. Seeds 

 numerous. — Pale purple. %. Aug. — ^Sept. Wet places. 1 — 2 feet. 



3. A. hu'milis, (Mich.) Stem erect, quadrangular, glabrous, some- 

 times branched. Leaves lanceolate, obtuse, tapering at the base. Flov)- 

 ers solitary, axillary. Calyx with 4 short, intermediate segments. 

 Petals 4, obovate. Stigyna capitate, nearly sessile. Capsule 4-celled, 

 Seeds numerous. — White. ©. On the coast. Sept. — Oct. 6 — 10 in. 



Genus III— LYTHRUM. L. 11—1. 

 (From the Greek luthron, black blood, from the purple color of the flowers.) 



Calyx cylindrical, with 4 — 6 short teeth, and generally with 

 as many intermediate processes. PetaU 4 — 6. Stamens equal, 

 or twice a5 many in number as the petals^ inserted into the 



