L XXXVIII. HYDROCHARIDACEAS. 
423 
Leaves with parallel longitudinal nerves, connected hy simple transverse 
veins. 
95. Mela nth ACE/E. Anthers extrorse. Cells of ovary and fruit many- 
seeded. — Terrestrial plants. 
98. Butomace.e. Anthers introrse. Cells of ovary and fruit many- 
seeded. — Water plants. 
99. Ausjiacejs. Perianth conspicuous, 3 inner segments highly de- 
veloped and petaloid. Cells of ovary and fruit 1 — 2-seeded. — 
Water plants. 
100. Juncaginace/E. Perianth inconspicuous; all the sepals similar, 
herbaceous or scarcely petaloid. Lower flowers stalked. Cells of 
ovary and fruit 1 — 2-seeded. — Marsh plants, but neither sub- 
merged nor floating. 
105. Naiadack.e. Perianth inconspicuous ; sepals all scale-like, cuneate 
at the base. Flowers all sessile, on a common peduncle; cells of 
ovary and fruit 1-seeded. — Submerged or floating plants. 
** Flowers imperfect ( stamens and pistils in separate flowers') or without a 
perianth. 
105. Naiadace.e. Spadix thin or wanting. Spatha none or similar to 
the leaves. Perianth none or inconspicuous. Carpels 1 — 1. — 
Submerged or floating plants. 
104. Pistiaceas. Spadix none. Flowers naked, 2 enclosed in a mem- 
branous spatha. Carpels solitary, 1-celled. — Floating plants. 
101. Typhace^e. Flowers crowded on a thick spadix, which is not 
enveloped by a spatha. 
102. Akace.-e. Flowers naked, crowded on a thick spadix, enclosed 
within a spatha. 
96. Restiace.e. Spadix none. Flowers bracteate, capitate. Ovary 
2 — 3-celled, with solitary ovules. Fruit dry, capsular, loeulicidal. 
94. Lii.iace.e. Spadix none. Flowers solitary (on the middle of the 
leaf). Ovary 3-celled ; cells with several ovules. Fruit succu- 
lent, indehiscent. — Shrubs. 
99. Ai.ismace.e. Spadix and spatha none. Flowers stalked. Perianth 
conspicuous, 3 inner sepals petaloid. Carpels numerous 1-celled. 
Div. I. Ovary inferior , adnate with the tube of the perianth. 
(Okd. LXXXYI1I. — XCII.) 
* Leaves with nerves from the base to the point , connected by 
simple transverse veins. (Ord. LXXXVIII. — XCI.) 
Ord. LXXXYIII. IIYDROCHARIDACEiE Juss. 
Flotvers perfect or imperfect, with a spatha. Limb of the 
perianth usually 6-parted ; the 3 inner segments petaloid, rarely 
wanting ; 3 outer herbaceous (very rarely petaloid ?). Stamens 
free from the style. Ovary solitary, 1- (or spuriously 3 — 6-) 
celled ; placentas parietal, sometimes projected into the axis and 
meeting there. Ovules anatropal. Stigmas 3 — 6. Fruit coria- 
ceous or fleshy, indehiscent, 1 — 6-celled. Albumen 0 . Em- 
bryo straight orthotropal. Radicle next the hilum. — Aquatics. 
