3>SG CXXTTII. ALISMACEJE. 



Stamens 6-18 or indefmite, liypogynous ; anthers 2-eelled. 

 Carpels 3-6 or many, altogether separate or more or less 

 cohermg ; ovules 1-2-5 or indefinitely numerous, erect or 

 ascending. Fruit dry, either 1-seeded nut-like and indehis- 

 cent, or 2-many-seeded follicular and opening by the ventral 

 suture. Seeds exalbuminous. — AVater or marsh plants, erect 

 or floating, stemless or caulescent. 



Water plants, with long petioled, obloug floating leaves ; 



flowers white, in simple or 2-Cd, floating spikes . . 1. AponogetoN. 

 Marsh plants, with channelled, grassy leaves ; flowers 



green, in erect spikes 2. TEiQLOcniN. 



1. APONOGETON, Thunb. 



Flowers bisexual. Sepals 2, coloured, persistent. Stamens 

 6-18; filaments subulate, persistent ; anthers 2 -celled. Car- 

 pels 3-5, erect, beaked ; stigma oblique, minute ; ovules 2-6, 

 basifixed, ascending. Follicles 3-4, opening inwards, 1-3- 

 seeded. Seeds erect, exalbuminous. — Edgw. in Hook. Lond. 

 Journ. Bat. 1844. p. 404. 



Water plants, with tuberous, esculent roots ; radical, long-petioled, 

 floating, oblong or lanceolate, many-nerved leaves ; and long, floating or 

 suberect scapes, bearing 1 or 2 dense spikes of white, sweetlj-scented 

 flowers. The tops of the flowering-stalks, boiled or stewed, are eaten. 

 — About 3 species, dispersed ; A. distachyon (Water Uintjes) is the com- 

 monest. 



2. TRIGLOCHIN, Linn. 



Flowers bisexual. Perianth 6-parted ; segments concave. 

 Filaments very short ; anthers roundish-elliptical, emarginate, 

 extrorse. Carpels 6, the alternate ones sometimes sterile 

 and rudimentary ; ovules solitary ; stigmas as many as the 

 fertile carpels, sessile, plumose. — Kunth Enwn. ii\. p. 142. 



Marsh plants, with narrow, channelled, radical leaves, and simple scapes. 

 Flowers small, green, minutely pedicelled, in dense spikes. — 3 species, of 

 which 2, T. maritimum and T. palustre, are common to Europe. 



Order CXXIX. NAIADEjE. 



Flowers mostly monoecious or dioecious, rarely bisexual. 

 Perianth often ; when present, 2-4-parted, herbaceous. 

 Stamens 1-4, hypogynous ; anthers sessile or on a filament, 

 1-2-4-celled. Carpels sessile, rarely stipitate, 1-ovuled ; ovule 

 erect or pendulous ; style 1 or ; stigmas 1-3. Fruit more 

 or less dry, indehiscent, 1-seeded. Seed without albumen. 

 — Water plants, mostly floating, with delicately cellular leaves ; 

 some are marine. 



