28 ANALYTICAL KEY. 



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



A. Spadiceous Division. Flowers aggregated on a spadix or Jleshi/ axis, 

 or sometlims scattered, destitute of calyx and corolla {excepting some Araceae 

 and Naiadaceas, 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^, 551 

 Immersed aquatics, branching and leafy. . . . Naiadace/E, 557 



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

 nerved leaves ; flowers in spikes or heads. 

 Flowers monoecious, and quite destitute of floral envelopes. Typhace^e, 547 

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

 Terrestrial or marsh plants; leaves mostly with a distinct 



netted-veined blade, petioled Arace^, 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. 

 flowers 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^, 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^, 496 



Anthers introrse or versatile, opening lengthwise. H^MODORACE-ffi, 512 



Anthers extrorse, opening lengthwise. . . . Iridace^, 513 



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



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

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

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



3. Perianth wholly free from the ovary. 



Pistils numerous or few in a head or ring. . . . Alismace^, 553 

 Pistil one, compound (cells or placentas 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. . Bromeliace^, 511 

 Marsh herbs ; carpels nearly distinct or separating closed from 



the axis; seed without albumen. Juncagineas, in Naiadace^, 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- r Liliace^, 517 



ored withering-persistent petals. Trillium in J 



Perianth of 3 persistent grieen sepals, and 3 epheme- 

 ral deliquescent petals. .... Commelinace^, 538 



