ANALYTICAL KEY. 31 



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. 



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

 Flowers dicEcious or polygardous, regular. 

 Aquatics : ovules and seeds several or numerous. Hydeocharidace^, 494 

 Twiners ; ovules and seeds one or two in each cell. Diosooreacb.e, 518 

 Flowers perfect : ovules and seeds usually numerous. 



Stamens only one or two : flower irregular, gynandrous. OECHiDACE.a:, 497 

 Stamens three. 

 Anthers introrse, opening transversely. . . BuKMANUiACEiE, 496 

 Anthers introrse or versatile, opening lengthwise. ILemodobace.e, 514 



Anthers extrorse, opening lengthwise Ibidace^, 515 



Stamens 6 : flowers usually on a scape from a bulb. AjMAEYLLiDACEiE, 512 



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



Perianth woolly or roughish-mealy : the leaves equitant. HiEMODOKACE^, 514 

 Perianth smooth : the leaves grass-like. Stenanthium, &.O., in LiLiACEiE, 520 



3. Perianth wholly free from the ovary. 

 Pistils numerous or few in a head or ring. . . . Alismace.s), 490 

 Pistil one : anthers 1-celled : flowers dioecious. Tendril-bearing. SMiLACB.a!, 5] 8 

 Pistil one, compound (cells or placenta; mostly 3) : anthers 2-celled. 

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

 Stamens 6 (in one Smilacina 4), all alike and perfect. 



Scurfy-leaved epiphyte : seeds hairy-tufted. . . Beomeliace.1!, 515 

 Eush-like marsh-herbs : carpels separating closed from the 



axis : seed without albumen. Triglochin, in Alismace^, 490 



Terrestrial, not rush-like : seeds with albumen. 

 Perianth of similar divisions or lobes, mostly colored?^ 

 Perianth of 3 fohaceous and green sepals and 3 col- > Liliace.e, 520 



ored withering-persistent petals. Trillium in ) 

 Perianth of 3 persistent green sepals, and 3 epheme- 

 ral deliquescent petals Commeltnace^, 546 



Stamens 6, dissimilar, or only three with perfect anthers. 

 Perianth of 3 herbaceous sepals and 3 unequal 

 and ephemeral petals. .... Commeltnace^, 546 



Perianth tubular, 6-lobed PoNTEDERiACEiE, 544 



Stamens 3, similar. Moss-like aquatic. Mayaca, under Xteidace.^;, 547 

 Perianth wholly glumaceous, of 6 similar divisions. Rushes. JuNCACEa;, 536 

 Perianth partly glumaceous or chaff-like : flowers in very 

 dense heads. Rush-like or aquatic. 

 Flowers perfect : inner perianth of three yellow petals : ^ 



perfect stamens and plumose sterile filaments each 

 3 : pod 1 -celled, many-seeded on 3 parietal placentse. Xtrii>ace.s;, 547 

 Flowers monoecious or dioecious, whitish-bearded : sta- 

 mens 4 or 3 : pod 2-3-celled, 2-3-seeded. EEiocAULOjtACE.s, 549 



