KEY TO THE ORDERS. xxiii 



A. PcrlantU superior <n<llicront to the ovary). 



* Flowers dicecioiis or polygamous, regular. 



Hydrochabidace^.— Aquatics. Pistillate flowers only 



above water ; perianth of 6 pieces 226 



DioscobeacEjE. — Twiners, from knotted rootstocka. Leaves 



heart-shaped, net-veined. Pod with 3 large wings. 236 



* * Flowers perfect. 



Oechidace^. — Stamens 1 or 2, gynandrous. Flowers irreg- 

 ular '. 226 



Iridace.k. — Stamens 3 235 



Amaryllidace.e. — Stamens 6. Flowers on a scape from a 



bulb 236 



B, Perianth Inferior (free from tUc ovary). 



AIjTSMACEj15. — Pistil apocarpous : carpels in a ring or head, 



leaves with distinct petiole and blade . . . * 224 



Smilacb.e. — Climbing plants, with alternate ribbed and 



net-veined petioled leaves. Flowers dicecious . . . 237 



Trigloehin, in 



Alismaob^e. — Rush-like marsh herbs,' Flowers in a spike 

 or raceme. Carpels when ripe splitting away 

 from a persistent axis 224 



LiOAOEyB. — Perianth of similar divisions or lobes, mostly 

 6, but in one case 4. One stamen in front of each 

 division, the stamens similar 237 



Trillium, in 



LlLIACE^. — Perianth of 3 green sepals and three coloured 



petals 237 



PontbderiacejE. — Stamens 6, 3 long and 3 short. Perianth 



(blue or yellow) tubular, of 6 lobes. Aquatics.. 247 



Ju.vcacEjE. — Perianth whollj'glumaceous, of similar pieces. 243 



Xyridace^. — Perianth partly glumaceous ; inner set of 3 



yellow petals. Flowers in dense heads, perfect. 247 



Eeiocaulonace^. — In shallow water. Flowers monoecious 

 or dioecious, in a small woolly head^ at the sum- 

 mit of a 7-angled scape. Leaves in a. tuft at the 

 base 247 



