AL1SMACE.E. ( WATER-PLANTAIN FAMILY.) 46] 
a spherical head on a globular receptacle, in fruit forming mem 
branaceous winged achenia. _ Marsh or aquatic herbs, with tniTy 
juice and fibrous roots; the scapes sheathed at the base by the 
bases of the long cellular petioles; of which the primary ones and 
—r v, th , em ’ are flaUCned ’ nerved > and destitute of any 
nerved ^ ^ Wh6n pr6Sent arrow - sha Ped or lanceolate^ 
whTld rb C T Vein ’ etS 38 in Alisma ‘ FIowers mostly 
whorled in threes, pedicelled, with membranous bracts; the sterile 
t'Lir *" ”° w ' "° n i”™ 1 '"' f »” 
r*. arsur tzs 
a most every pool and stream furnishes a goodly number’ embraces 
s.",rs„TT“/*r° r -’ “ d "v -iTtwrr 
obtusa i .. ar Vh Un ? W,th,n °“ r limite ’ “ even ,he dioecious 8. 
leaves’ Perm ^ States bear triangular-arrow-shaped 
and the lobesTnTa 8 I Wid<!: °‘ her8 ^ b ° th the main blade 
late or 1 ne„ , ; “ any bCar 6ntire leaves ’ eilher ob l°”g, lanceo- 
« and in tba forms 
Order 114. HYDROCHARIDACE.*. Frog’s-bitFam. 
■Aquatic herbs , iciV/i dicecious or polygamous regular 
Jiotoers on scape-like peduncles from a spathe, and simple or 
double floral envelopes, which in the fertile flowers are 
united into a tube and coherent with the 1 -6-celled ovary. 
tamens 3-12, distinct, or monadelphous : anthers 2-cell- 
Stigmas 3 or 6. Fruit ripening under water, indehis- 
cent, many-seeded. Seeds ascending, without albumen : 
embryo straight. 
Synopsis. 
1 Li ® l *gmas 6-9, two-parted : ovary 6-9-celled. (Floating.) 
imnobium. Filaments united in a solid column : anthers 6-12, 
hnear. 
2- Udora 18 *T ° Var ^ l‘ ce N e< * with 3 parietal placentae. (Immersed.) 
Tube of the 6-lobed perianth greatly prolonged in the 
3 y tertlle flowers. 
lusveria. Tube of the 3-lobed perianth not prolonged be¬ 
yond the ovary. 
39* 
