MONOCOTTLEDONES. 701 



Carpels combined into a solid pistil. 

 Inner whorl of the perianth different from the 

 outer. 

 Placentas axile. Anthers 2-celled. Capsule 



2— 3-celled CommelynacecB. 264. 



Placentas parietal. 



Anthers 2-celled. Capsule 1-celled . . XyridacecB. 265. 

 Anthers 1-celled. Capsule 1-celled . . Mayacece. 263. 

 The outer and inner whorls of the perianth 

 alike. 

 Flowers on a spadix. Embryo with a lateral 



slit Orontiacece. 268. 



Flowers not on a spadix. Embryo without 



a slit, JuncacecE. 267. 



b. Outer whorl of the perianth petaloid, or the 

 whole petaloid when only one whorl is present. 

 Carpels more or less distinct. 

 Seed solitary. Flowers on a spadix . . Pabnacece. 269. 

 Seeds numerous. Flowers not on a spadix. 



Anthers extrorse Melanthacece, 260. 



Anthers introrse. 

 Perianth of 6 parts. Seeds without al- 

 bumen Butomacece. 272. 



Perianth of 2 parts. Seeds with albumen Philydracece. 266 

 Carpels combined into a solid pistil. 



Perianth rolled inwards after flower- 

 ing. Aquatics Pontederacea. 262. 



Perianth not rolled inwards after flower- 

 ing. Perianth minute, with coloured 



bracts externally GilliesiacecB. 261 . 



Perianth not rolled inwards after flower- 

 ing, conspicuous, without coloured 

 bracts Liliacece. 259. 



2. Flower.s either naked, or with a whorled scai,"? Perianth, 



GENERALLY UNISEXUAL (DlcUneS). 



A. Flowers on a spadix. 



a. Flowers bisexual. 



Embryo cleft Orontiacece. 268. 



Embryo solid Pandanacece. 273, 



b. Flowers unisexual. 



Embryo solid Pandanacece. 273. 



Embryo cleft on one side. 

 Flowers with a true spathe. Fruit succulent. 



Anthers sessile, or nearly so . . . Aracece. 275. 

 Flowers without a true spathe. Fruit dry. 

 Anthers on long filaments .... Typhacece, 274. 



B. Flowers not arranged on an evident spadix. 



a. Flowers bisexual. 



Ovary superior Juncaginacece . 270. 



Ovary inferior Hydrocharidaceee. 28 



b. Flowers unisexual. 



Ovules erect. 

 Embryo complete. 

 Seed without albumen .... NaiadacecB. 277. 



Seed with albumen Pistidcece. 276.* 



Embryo rudimentary Triuridacece . 279. 



Ovules pendulous. 

 Carpel solitary. 

 Seed without albumen. 



Pollen globose Naiadacea. 277. 



Pollen filamentous or confervoid . . . Zosteracece. 278 



Seed with albumen Bestiacecc. 28l. 



Carpels several, distinct. 



