255 
Crass II. MONOCOTYLEDONS. 
Stem not distinguishable into Fe th, wood and bark, but, when 
erennial, consi sting of bundles of fibres icd imbedded in cellu- 
ar tissue, with a firmly adherent rind o e. with one 
sheath-like cavity on one iras rbs or if ar eod the stem 
eat. 
the next leaf, pinnate or otherwise divided in some Palms and Aroidea, 
Cpu lobed ina very Sj species, and net-veined in a few 
of ders. Parts of the flower most frequently in n threes, or in 
hr yir the. perianth Bee or the parts reduced in number 
ion irregular, or in twos or fours in Naiadee. 
Oxper CXVIII. HYDROCHARIDEJE. 
males. Stamens 3 to 12 or rarely more. Anthers 2-celled. en 
inferior, either 1-celled with 3 parietal opus or more or less per- 
fect tly divided into 3, 6, or 9 cells. eae es 3, 6, or 9, with entire or 
2-cleft stigmas. vules numerous, ascending or ndulous, ortho- 
tropous or iR pA. attanhie d to placentas lining the walls or disse- 
piments of the ovary. Fruit indehiscent, membranous or fleshy, ripening 
under water. Seeds several or many, without albumen. Embryo mengas 
the e plumule more or less lateral, the radicle next the hilum m.—Aquat 
herbs, entirely submerged or the lamina of the leaves floating. [emen 
undivided. Flowe rs enclosed ie young in a spathe, either of 1 to3 
Caves or tubular abd 2- or 3-lobed, the males 1, 2 or more in the 
Spathe, the females solita: 
The Order has e ver the tropical and temperate ns both of the Now 
and the Old Word gee of the oe Australian ex cies ing general area of 
Order, the r two are limited to the Old 
ond st oating. Leaves with a broad 
dial poe ry ar 3 flo Ir Ovira and mit pcd 1. HypgocHaRis. 
Tate. of radical leaves and scapes fixed to the bottom of th 
aen: lamina. Flowers hermaphrodite, s 
aby paitially 6- elled . 2. OTTELIA. 
Nadel elongate without any lamina. Flowers unisexual. 
Male flowers several in the ean exserted. Perianth of t. 
Be; . . 
Meli ieee crowded in a head shorter than the 
pathe. Perianth of 3 se 4. VALLISNERIA. 
Leaves : am vetus along the ating s stems. s. Spathes sossile, 
both males and females 1-flowered . 5. Hyprmua. 
