THE AMERICAN BOTANIST 



27 



ts very small without true leaves. Aquatic, 

 ts larger, leafy (2) 



lowers in a dense head or on a spadix (3). 

 Perianth colored, conspicuous. 



Flowers yellow. 



Flowers white. 



Perianth inconspicuous or wanting. 

 Spadix on a scape or in a spathe. 

 Spadix spike-like. 



Submersed or floating plants. 

 Marsh plants, erect. 



Flower clusters cylindrical. 

 Flower clusters globular. 



owers not in dense heads nor on a spadix (4). 

 4 Flowers surrounded by husk-like scales. 

 Stems solid, sheaths entire. 

 Stems usually hollow, sheaths split. 

 4 Flowers with conspicuous perianth (5). 

 5 Ovary inferior, perianth adherent (6). 

 6 Stamens one or two ; flower irregular. 

 Anthers one-celled. Seeds solitary. 

 Anthers two-celled. Seeds many. 

 6 Stamens three or more ; flowers mostly regular. 

 Leaves net-veined ; plants climbing. 

 I,eaves parallel veined ; not climbing. 

 Perianth woolly on the outside. 

 Perianth not woolly. 



Flowers dioecious or polygamous. 

 Flowers perfect ; terrestrial. 

 Stamens six. 

 Stamens three. 



Alternate with the inner segments. 

 Opposite the inner segments. 

 5 Ovary superior ; perianth free (7). 



7 Calyx and corolla unlike in color. 

 Carpels several, distinct. 

 Carpels three united. 



Leaves three or more, in whorls. 

 Leaves alternate. 



Stigmas three. Epiphytes. 

 Stigmas united into one. 



7 Calyx and corolla colored alike (8). 

 8 Leaves net-veined. 



Flowers dioecious, six-parted. 

 Flowers perfect, six-parted. 



8 Leaves parallel veined (9). 



9 Styles and often the stigmas united. 

 Flowers greenish. 

 Flowers colored. 



Regular ; stamens six. 

 Irregular or with three stamens. 

 9 Styles and stigmas three, distinct. 

 Ovary three-seeded. 

 Ovary six or more seeded. 



Lemnaceae. (G. 259. B. 232) 



Xyridaceae. (G. 262. B. 235) 

 Eriocaulonaceae. (G. 261. B. 236) 



Araceae. (G. 257. B. 229) 



Naiadaceae. (G. 69. B. 40) 



Typhaceae. (G. 67. B. .38) 

 Sparganiaceae. (G. 67. B. 39) 



Cyperaceae. (G. 171. B. 158) 

 Gramineae. (G. 86. B. 61) 



Marantaceae. (G. 304. 

 Orchidaceae. (G. 304. 



Dioscoreaceae. (G. 297. 



Haemodoraceae. (G. 296. 



Hydrocharitaceae. (G. 85. 



Amaryllidaceae. (G. 297. 



Iridaceae. (G. 299. 

 Burmanniaceae. (G. 304. 



Alismaceae. (G. 80. B. 53) 



Trilliaceae. (G. 279. B. 273) 



Bromeliaceae. (G. 265. B. 238) 

 Commelinaceae. (G. 264. B. 239> 



Smilaceae. (G. 279. B. 275) 

 Trilliaceae. (G. 279. B. 274> 



Juncaceae (G. 267. B. 244) 



Liliaceae. (G. 279. B. 260) 

 Pontederiaceae. (G. 266. B. 242) 



Juncaginaceae. (G. 79. B. 52) 

 Melanthaceae. (G. 279. B. 254) 



