714 
DIOECIA ENNEANDRJA. 
Foeminei. Spatha 
monophylla, uniflora. 
Calyx 3-phyIlus. Co- 
rolla 3-petala. Glan- 
dules 6, inter petala. 
Germen inferum. Sty- 
li 6 , bifidi. Capsula 
6-locularis, polysper- 
raa. 
1. Spongiosa. Bose. 
H. monoica; foliis 
natantibus, rotundato- 
cordatis, subtus reticu- 
latis, basi vesiculosis. 
Fertile fiorets. » 
Spathe 1 -leaved, 1- 
flowered. Calyx 3- 
leaved. Corolla 3-pe- 
talled, with 6 glands 
between the petals. 
Germ, inferior. Styles 
6, 2-cleft. Capsule 6- 
celled, many seeded. 
Monoecious; leaves 
floating, round, cor- 
date, reticulate under- 
neath, with vesicles at 
base. 
Bose. Annales du Museum, 9. p. 396. 
H. Cordifolia, Nutt. 2. p. 241. 
Since I have become acquainted with the different views which have been 
taken of this plant, I have had no opportunity of examining it in a living 
state. I shall, therefore, merely insert the notes I took of it many years 
ago. 
Root perennial, sarmentose. Leaves from the root, floating, orbicular, 
cordate, glabrous, 1 — -2 inches in diameter, with prominent purple veins 
underneath, and some inflated vesicles near the summit of the stem. Peti- 
oles 2 — 4 inches long. Flowers axillary, monoecious. Sterile florets:— 
Spathe — leaved, — flowered; leaves membranaceous, hyaline, nerved. 
Calyx 3-leaved, leaves oval, membranaceous, without nerves, green. Co- 
rolla white, 3-petalled, petals as long as the calyx, but narrower, peduncle 
longer than the sheath, hyaline; filaments generally 12, united at base; the 
interior ones abortive; anthers attached to the sides of the filaments. Fer~ 
tile florets: — Spathe one-leaved, one-flowered, peduncle of the flower very 
short, of the fruit long deflected. Calyx and corolla like those of the ste- 
rile floret. Glands 6 very small, setaceous, inserted by pairs between the 
petals. Germ inferior, ovate, truncate. Styles 6, as long as the corolla* 
deeply 2-cleft, furrowed on the interior surface. Stigmas simple, spotted 
Capsule striate, 6-celled. Seeds numerous, striate, (hirsute. Nuttall.) 
Grows in stagnant water. 
Flowers July — September. 
