XXVlll" ANALYTICAL KEY. 



CLASS II. MONOCOTYLEDONOUS OR ENDOGENOUS PLANTS. 



Steins with the wood collected into separate bundles or threads, which 

 are irregularly dispersed throughout the whole diameter, leaving no dis- 

 tinct pith in the centre; not forming annual layers. (A transverse slice 

 of the stem therefore exhibits the woody threads as dots scattered 

 throughout the cellular tissue.) Leaves mostly parallel-veined (occasion- 

 ally more or less reticulated). Embryo with a single cotyledon, and the 

 first leaves in germination alternate. Parts of the flower generally in 

 threes, never in fives. 



A SPADICEOUS DIVISION. Flowers aggregated on a spadix or fleshy axis, or 

 sometimes scattered, destitute of calyx and corolla (excepting some Araecae, where, 

 however, they are on a spadix) and also of glumes (husky scales). Leaves often 

 with netted veins. 



Little floating aquatics, with no distinction of stem and foliage. 430 LEMNACE.S:. 

 Terrestrial or aquatic, with root, stem, and leaves. * 



Immersed aquatics, with jointed stems and inconspicuous 



flowers. 431 NAIADACB^. 



Reed-like or Flag-like marsh or aquatic herhs, with linear 

 and sessile nerved leaves : flowers in spikes or heads. 



Flowers monoecious : destitute of floral envelopes. . 429 TYFHACE^E. 

 Flowers perfect, on a lateral spadix : sepals 6. Acorus, ^ 

 Terrestrial or marsh plants : leaves mostly with a distinct > 426 (80) ARACEJS. 

 netted-veined blade, petioled. J 



B. PETALOIDEOUS DIVISION. Flowers not collected on a spadir, furnished with 

 floral envelopes (perianth) answering to calyx or to botJi calyx and corolla^ either 

 herbaceous or colored and petal-like. 



# Perianth adherent to the whole surface of the ovary (superior). 

 Flowers dioecious or polygamous, regular. 



Aquatics : ovules and seeds several or numerous. 440 HYDROCHARIDACE.E. 

 Twining plants : ovules and seeds one or two in each 



cell : veinlcts of the leaves reticulated. . 460 (84) DIOSCOREACK/B. 

 Flowers perfect : ovules and seeds usually numerous or several. 

 Stamens (bearing anthers) only one or two : flower irregular. 



Gynandrous : ovary 1-celled with 3 parietal placentae. 442 ORCIUDACE.*. 



Not gynaudrous : ovary 3-celled (80) CANNACEA:. 



Stamens 3. 



Anthers introrse, opening transversely. . . 442 BURMANNIACE*. 



Anthers introrse or versatile, opening lengthwise. 457 H^MODORACE^I:. 



Anthers cxtrorsc, opening lengthwise. . . 459 (82) IRIDACE.B. 



Stamens 6 : flowers usually on a scape from a bulb. 455 (80) AMARY LLIDACBJK. 



