ENDOGENOUS PLANTS. 



merit at least, occupy the central part of the stem. Leaves seldom 

 falling off by an articulation, commonly sheathing at the base, 

 usually alternate, entire, and with simple nearly parallel veins (or 

 nerves, so called). Floral envelopes, when present, mostly in threes ; 

 the calyx and corolla often undistinguishable in texture and appear- 

 ance. Embryo with a single cotyledon ; or if a second is present, 

 it is much smaller than the other and alternate with it. 



GROUP 1. Flowers on a spadix, with the perianth simple, scale- 

 like, or commonly altogether wanting. 



Terrestrial plants: 

 Mostly with a spathe : fruit baccate. ARACEAE. p. 297. 



Fruit nut-like, I-seeded. TYPHACEAE. p. 301. 



Aquatic plo.nts : 



Flowers in the edge of the frond. LEMXACEAE. p. 300. 

 Flowers axillary ? or on a spadix. NAIADACEAE. p. 302. 



GROUP 2. Flowers not spadiceous. furnished with calyx and corolla. 

 Ovaries several, distinct or sometimes united, free from the calyx. 

 ALISMACEAE, p. 304. 



GROUP 3. Flowers with a simple or double Perianth, adherent to 

 the ovary, either completely or partially. 



f Perianth regular. Ovary 1-celled with parietal placentae, or rarely 3- to 6-ceUed 

 with the placentae in tJie axis. 



Flowers dioicous, or polygamous. HYDBOCHARIDACEAE. p. 305. 

 t f Perianth irregular. Ovary ~\.-celled with parietal placentae, Stamens lor 2. 



Flowers gynandrous. ORCHIDACEAE. p. 307. 



fft Perianth mostly regular. Ovary 3-ceUed, many-ovuled. Stamens 3 or 6. 



Anthers introrse. Stamens mostly 6. 



Bulbous. AMARTLLIDACEAE. p. 316. 



Not bulbous. HAEMODORACEAE. p. 317. 



Anthers extrorse. Stamens 3. IRIDACEAE. p. 317. 



f f f f Perianth regular. Ovary 3-celled with 1 or 2 ovules in each ceU. 



Flowers dioicous. Stamens 6. DIOSCOREACEAE. p. 318. 



GROUP 4. Flowers with a regular Perianth, which is free from the 

 ovary, more or less petaloid, or rarely glumaceous. Embryo inclosed 

 in albumen. 



Perianth not glumaceous. 

 Anthers introrse. styles or stigmas distinct. SMILACEAE. p. 319. 



Anthers introrse. Styles united into one. 



Terrestrial : not spathaceous. Flowers regular. LILIACEAE. p. 321. 



Aquatic: spathaceous. PI. of 'ten irregular. POSITEDERIACEAI. p . 332. 



Anthers mostly extrorse. MELANTHACEAE. p. 327. 



Perianth glumaceous. JUXCACEAE. p. 330. 



GROUP 5. Flowers with a double or imbricated perianth; the exte- 

 rior herbaceous, or glumaceous ; the inner petaloid, free from the 

 1- to 3-celled ovary. Seeds orthotropous ; the embryo at the ex- 

 tremity of the albumen farthest from the hilum. 



