68 ENGLISH BOTANY. 
Sus-Orprr I].—ALISMEZE. 
Perianth with the 3 outer segments herbaceous, the 3 inner Is 
and petaloid. Stamens 6 or more; anthers introrse, rarely extrorse.| 
Seeds 1 or 2 in each cell of the ovary; embryo hooked. 
GENUS TI.—SAGITTARIA. Linn. 
Fowers monecious. Perianth with the 3 outer leaves herbaceous, 
subpersistent, the 3 inner leaves larger and petaloid, caducous. Male! 
flowers with numerous hypogynous stamens; filaments filifo ea 
anthers extrorse, affixed by the base. Female flowers with the ovs es. 
very numerous, free, 1-celled and l-oyuled; stigma simple. Fr 
numerous capitate achenes. 
Marsh herbs with the rhizome throwing off runners terminating in 
bulbs, which produce plants in the succeeding year. Leaves stalked, 
without any lamina and submerged or floating. Flowers white or 
in a raceme on a scape with verticellate peduncles; the male flowers, 
at the top and the female below them, 
The name of this genus of plants comes from sagi{ta, an arrow, which the leaves o 
the species are thought to resemble. 
SPECIES I-SAGITTARIA SAGITTIFOLIA. Li 
Prats MCCCCXXXVI. 
Reich. Ic. Fl. Germ. et Helv. Vol. VII. Tab. LIT. Fig. 94. 
Billot, Fl. Gall. et Germ. Exsice. No. 2913. 
Submerged leaves (phyllodia) linear-strapshaped or linear-oblanee- 
olate, submerged or floating at the apex, translucent; aerial leaves, 
sagittate with “Straight acute basal lobes. Scape eae Peduneles. 
whorled, those of the fertile flowers not half as long as those of the 
sterile flowers. Filaments subulate, longer than the anthers. 
In canals, ditches, and slow running rivers. Rather scarce, . 
generally distributed in England. Common in the fenny counties. 
Rare, and doubtfully native in Scotland, though it occurs about 
Renfrew and other places near Glasgow. Looal in Ireland, but, 
occurring in the west, centre, and north- east of the island. ¢ 
England, [Scotland,] Ireland. Perennial. Late Summer, — 
Autumn. a 
‘a 
tootstock a small corm emitting elongated runners, which produce, 
f 
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