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LILEZA | NAITADACEZ 673 
ZANNICHELLIA 
lower wingless and laterally toothed at the summit, Seed with 
membranous testa ana straight narrow embryo. 
L. subulata Humb. & Bonpl. |. c. Leaves 6 inches to 2 feet long or 
more, 1-2 lines thick: heads crowded, 6-12 lines long, on scapes shorter 
than the leaves: staminate bracts narrowly oblong, obtuse, 4% line long, 
twice longer than the anthers: radical fruits 3 lines long, the filiform styles 
often nearly as long as the scapes: upper fruits elliptical, acute, somewhat 
smaller. In shallow water or mud, Vancouver Island to South America. 
§ ZANNICHELLIA _L. Sp. 969. 
Very slender immersed branching aquatic herbs with filiform 
flattened mostly opposite leaves, with small free membranous 
stipules,and inconspicuous moneecious flowers in axillary clusters. 
Staminate flowers of a single naked stamen with elongated fila- 
ment and 2-celled anther. Pistillate flowers usually in the same 
axils, of 2-5 sessile or shortly stipitate ovaries in a membranous 
cup-shaped perianth or spathe: style short, with peltate stigma. 
Ovule solitary, suspended. Fruit an obliquely oblong coriaceous 
nutlet, somewhat compressed, beaked by the short style. Seeds 
with membranous testa. Embryo slender, the attenuate cotyle- 
donary end bent into a coil. 
Z. palustris L. Sp. 969. Stems 2 inches to 2 feet long, branching and 
leafy: leaves about 3 inches long, 14 line or less wide, thin, l-nerved: fruit 
sometimes incuryed, often more or less toothed on the back. 1-14 lines 
long, about twice longer than the style, usually becoming shortly stipitate 
.and often also pedunculate. In fresh-water ponds and slow streams, 
throughout most parts of the World. 
6 RUPPIA L. Sp. 127. 
Slender branching submersed herbs growing in brackish or salt 
water, with filiform or capillary alternate leaves, with broadly 
sheathing bases, and small perfect flowers enclosed in the base of 
the leaves. Flowers on a capillary spadix-like peduncle, without 
perianth, consisting of 2 sessile antners, each with 2 separate cells, 
attached by the back to the neduncle, haying between them sey- 
eral pistillate flowers in 2 sets on opposite sides of the rachis, the 
whole at first enclosed in the base of a leaf, the peduncle at length 
long exserted and bearing the ovaries in 2 clusters at the end. 
Ovaries at first sessile, with nearly sessile depressed stigmas and 
solitary suspended camplytropous ovules. Fruit obliquely ovoid, 
very shortly beaked, on elongated:slender stipes, hard and drupe- 
like. Seed with membranous testa. Embryo ovoid, with short 
cotyledon and short lateral plumule. 
R. maritima L. Sp. 157. Stems elongated, filiform, 6-20 inches or 
more high, leafy : leaves 2-4 inches long, 14 line wide, with usually broadly 
dilated bases: flowers 2-8, in a short close spike: fruiting peduncle 3-6 
inches long, contorted: fruit 14g lines long, the stipe 1-12 lines long. In 
brackish or salt pools along the coast. Alaska to California, and in most 
parts of the world. ' 
