28 ANALYTICAL KEY. 



CLASS II. MONOCOTYLEDONOUS PLANTS. (See p. 15.) 



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

 or sometimes scattered y destitute of calyx and corolla (excepting some Aracess 

 and Naiadaceee, where, however, they are on a spadix), and also without 

 glumes (husky scales). Leaves sometimes with netted veins. 



Little floating aquatics, with no distinction of stem and foliage. LEMNACE^E, 551 

 Immersed aquatics, branching and leafy. . . . NAI ADAGES, 557 



Keed-like or Flag-like marsh herbs, with linear and sessile 



nerved leaves ; flowers in spikes or heads. 



Mowers monoecious, and quite destitute of floral envelopes. TTPHACE^E, 547 

 Flowers perfect, on a lateral spadix ; sepals 6. Acorus, in ARACE^E, 550 

 Terrestrial or marsh plants; leaves mostly with a distinct 



netted-veined blade, petioled ARACE^E, 548 



B. PETALOIDEOUS DIVISION. Flowers not collected on a spadix, furnished 

 with floral envelopes (perianth) answering to calyx or to both calyx and 

 corolla, either herbaceous or colored and petal-like (wholly glumaceous in 

 Juncaceae). 



1. Perianth adherent to the whole surface of the ovary. 

 I lowers dioecious (or rarely perfect), regular. 



Aquatics ; ovules and seeds several or numerous. HYDROCHARIDACE^, 495 

 Twiners ; ovules and seeds one or two in each cell. DIOSCOREACE^B, 517 

 Flowers perfect ; ovules and seeds usually numerous. 



Stamens only one or two ; flower irregular, gynandrous. ORCHIDACE^, 497 

 Stamens three. 



Anthers introrse, opening transversely. . . BURMANNIACE^E, 496 



Anthers introrse or versatile, opening lengthwise. ELEMODORACEJE, 512 



Anthers extrorse, opening lengthwise. . . . IRIDACE^E, 513 



Stamens 6 ; flowers usually on a scape from a bulb. AMARYLLIDACE^E, 515 



2. Perianth adherent only to the base or lower half of the ovary. 

 Perianth woolly or roughish-mealy; leaves often equitant. ILEMODORACE^, 512 

 Perianth smooth ; the leaves grass-like. Stenanthium, etc., in LILIACE^BJ, 517 



3. Perianth wholly free from the ovary. 



Pistils numerous or few in a head or ring. . . . ALISMACEJB, 553 

 Pistil one, compound (cells or placentae mostly 3). 



Perianth not glumaceous or chaffy ; flowers not in dense heads. 

 Stamens 6 (in Maianthemum 4), similar and perfect. 



Scurfy-leaved epiphyte ; seeds hairy-tufted. . BROMELIACEJB, 511 

 Marsh herbs ; carpels nearly distinct or separating closed from 



the axis ; seed without albumen. Juncagineae, in NAIADACE^B, 557 

 Terrestrial, not rush-like ; seeds with albumen. 



Perianth of similar divisions or lobes, mostly colored. ") 



Perianth of 3 foliaceous and green sepals and 3 col- ? LILIACE^E, 517 



ored withering-persistent petals. Trillium in ) 

 Perianth of 3 persistent green sepals, and 3 epheme- 

 ral deliquescent petals. , . COMMELINACE.ZE, 538 



