ANALYTICAL KEY. 31 



15. 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 dioecious or polygamous, regular. 



Aquatics : ovules and seeds several or numerous. Hydrochakidacete, 494 



Twiners : ovules and seeds one or two in each cell. Dioscoheace^e, 518 



Flowers perfect : ovules and seeds usually numerous. 



Stamens only one or two : flower irregular, gynandrous. Orohidace.e, 497 



Stamens three. 

 Anthers introrse, opening transversely. . . BtiRMANNiACEiB, 496 

 Anthers introrse or versatile, opening lengthwise. BLemodorace^e, 514 

 Anthers extrorse, opening lengthwise. . . . Iridace.e, 515 



Stamens 6 : flowers usually on a scape from a bulb. Amaryllidace^e, 512 



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



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

 Perianth smooth : the leaves grass-like. Stenanthium, &c, in Liliace^e, 520 



3. Perianth wholly free from the ovary. 

 Pistils numerous or few in a head or ring. . . . Alismace^e, 490 



Pistil one : anthers 1-celled : flowers dioecious. Tendril-bearing. Smilace^:, 518 

 Pistil one, compound (cells or placentas mostly 3) : anthers 2-celled- 

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

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



Scurfy -leaved epiphyte : seeds hairy-tufted. . . Bromeliace^e, 515 

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



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



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^, 520 



ored withering- persistent petals. Trillium in ) 

 Perianth of 3 persistent green sepals, and 3 epheme- 

 ral deliquescent petals Commelynace^e, 546 



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

 Perianth of 3 herhaceous sepals and 3 unequal 



and ephemeral petals. .... Commelynace^e, 546 



Perianth tubular, 6-lobed Pontederiace^e, 544 



Stamens 3, similar. Moss-like aquatic. Mayaca, under Xyridace^j, 547 

 Perianth wholly glumaceous, of 6 similar divisions. Pushes. Juncace;e, 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 placenta?. Xyridace^, 547 

 Flowers monoecious or dioecious, whitish-bearded : sta- 

 mens 4 or 3 : pod 2-3-celled, 2-3-seedcd. Eriqcaulonace^e, 549 



