386 _ CXXVIII. ALISMACER. 
Stamens 6-18 or indefinite, hypogynous; anthers 2-celled. 
Carpels 3-6 or many, p lroppahee separate or more or less 
cohering; ovules 1-2-5 or indefinitely numerous, erect or 
ascending. Fruit dry, either 1-seeded nut-like ath indehis- 
cent, or 2-many-seeded follicular and opening by the ventral 
suture. Seeds exalbuminous.— Water or marsh plants, erect 
or floating, stemless or caulescent. 
Water plants, with long petioled, oblong floating leaves ; 
flowers white, in simple or 2-fid, floating spikes . . 1. APONOGETON. 
Marsh plants, with channelled, grassy eee flowers 
green, inerect spikes . .. ... « . . . 2 TRIGLOCHIN. 
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, pei spp in Hook. Land. 
Journ. Bot. 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, aweetly- -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 Enum. iii. 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, 7. maritimum and 7’. palustre, are common to Europe. 
Orper CXXIX. NAIADER. 
Flowers mostly moncecious or dicecious, rarely bisexual. 
Perianth often 0; when present, 2—4-parted, herbaceous. 
Stamens 1-4, hypog ynous ; anthers sessile or on a filament, 
1-2-4-celled. Carpels sessile, rarely stipitate, 1-ovuled ; ovule 
erect or pendulous; style 1 or 0; stigmas 1-3. Fruit more 
or less dry, andéhiscentt, 1-seeded. Seed without albumen. 
— Water plants, mostly floating, with delicately cellular leaves ; 
some are marine. 
