412 S6. AUSStACEi. 
Suborder I. ALISMOII)E.«. 
Tliree inner perianth-segni. petal-like, .ieedb 1 — 2 in each 
cell, erect or ascending, on the suture. Embryo cylindrical, 
doubled upon itself : radicle next the hile. 
1. Alisma. F1. perfect. Stam. 6. Carp. man>/^'oiTning a 
ring or head, small, 1-seeded. not bursting. — E. ovate or 
narrow. 
?. DamasojiTum. F1. perfect. .Stam. y. Cai j>. 6 — o, rather 
large, 2-seeded, combined at the base and spreading in a 
/odiant manner. L. cordate-oblong. 
3. Sagittaria. F1. monoecious. Male fl. with many sta- 
mens. Female fl. with inany l-seeded compressed rarjtels 
foi-rniivi n. hmd. upon a globose receptacle. — L. sagittate. 
.Suborder II. BrTOME E. 
Three inner perianth-segm. petal-like : three outer herbaceous 
or slightly coloured, ^eeds many, minute. Placenta ramified 
over the inner surface of each carpel. Embryo straight or 
curved : radicle next the hile. 
4. BuTOMUs. Perianth-segm. 6, all coloured, resembling a 
corolla. .Stam. 9. Carpels 6, connected below. 
Suborder III: .JUNCAi ilNE.E. 
Perianth uniform, herbaceous, inconspicuous, or 0. .Seeds 
1 — 2, erect, close together and at the base of the carpel. 
Embryo straight ; radicle next the liile : plumule coming 
through a lateral cleft in the embryo. 
5. .ScHHUcHZEKiA. Perianth of 6 reflexed leaves. .Str-.m. 6, 
with slender filament--. OvariesS. Stigma sessile. downy. 
Carpels compressed, inflated, diverging, 1 — 2-seeded, free. 
6. TrI'.lochix. PeriauthofC erect deciduousleaves. Stam. 
6 ; anth. almost 3es.sile. Ovaries 3 — 6. Stigmas sessile, 
feather}-. Carp, attached to an angular axis, from which 
they at length separate at the base. 
