310 ORDER XLVII. LYTIIRACE,£. 



2. Calyx C-toothcd, vcntricose Cuphea, 5 



Calyx with leaa than (> teeth, not vcntricose 3 



3. ( 'alyx 4 — (3 teeth, cylindrical Ly thrum, 3 



Calyx cainpanulate 4 



4 Calyx 4-lobed Ammannia, 2 



Calyx with 5 teeth Decodon, 4 



Genus I.— HYPOBRICH'IA. Peplis, 4—1. 



Calyx 4-lobed and sometimes with intermediate segments, 

 campanulate, apetalous. Stamens 2 — 4. Ovary 2-celled, glo- 

 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'lii, (L.) Stems leafy, immersed. Leaves numerous, 

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

 small. Stamens 2 — 4, shorter than the calyx. — 0. July — Aug. In 

 still waters. 12 — 20 inches. Water Purslane. 



Genus II.— AMMAN'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. Stents square ; leaves opposite. Flowers axillary, 

 with 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-eelled. — Purple. 0. July — Aug. Near Macon. 10 — 20 in. 



2. A. ramos'iok, (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. Sta)>icns 4. Capsule globose, furrowed. Seeds 

 numerous. — Pale purple. 0. Aug. — Sept. Wet places. 1 — 2 feet. 



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

 timea blanched. Leaves lanceolate, obtuse, tapering at the base. Flow- 



olitary, axillary. Calyx with 4 short, intermediate segments. 

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

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



Gtaros III.— LY THKi'M. L. 11—1. 



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



Calyx cylindrical, with 4 — ahorl teeth, and generally with 

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

 or twice as many in number as the petals, inserted into the 



