Moore— 0;^ the3Iosses of Ireland, 
445 
Stem erect or floating, pinnate ; leaves loosely 
imbricated, uppermost falcate-secund, 
ovate-lanceolate, subserrulate at the apex ; 
nerved above half way ; capsule ex- 
annulate. Monoicous, . . . . 54. H. fluitans. 
Stem erect, pinnate ; cauline leaves distant, 
loose, cordate-lanceolate, branch-leaves 
subsecund, lanceolate-acuminate, entire ; 
nerved more than half way. Dioicous, . 55. H. Kneiffii. 
aaaa. Leaves serrulate, nerved above half way to apex. 
Stem procumbent, radiculose, pinnate ; leaves 
falcate-secund, cordate at base, elongate- 
acuminate, plicate ; nerve not quite ex- 
current. Dioicous, . . . . 56. H. commutatijm. 
Stem sub-erect, branches pinnate ; leaves fal- 
cate-secund, spreading, ovate-acuminate; 
nerve percurrent. Dioicous, . . . 57. H. filicinum. 
Stems with innovations, crowded, pectinately branched ; leaves of 
the branches falcate, circinate. 
Stems pinnate, sub-erect, much crowded; 
leaves falcate-secund, cordate-acuminate, 
serrate, slightly striate, with two short 
nerves; capsule ovate, cernuous, lid co- 
nical. Dioicous, . . . . , 58. H. molluscum. 
Stems procumbent, pinnate ; leaves circinate- 
secund, tapering into acuminate, nar- 
row points, nerveless ; capsule subcylin- 
drical, arcuate. Monoicous, . . . 59. H. hamtjlosfm. 
Stems procumbent, subpinnate ; leaves falcate- 
secund, ovate-lanceolate, acuminate, 
scarcely serrulate; nerveless, or shortly 
two-nerved at base ; capsule cylindrical, 
erecto- cernuous ; lid conico-ro stellate. 
Dioicous, . . . . . . 60. H. cuphessiforme, 
aaaaa. Leaves squarrose, shortly nerved or nerveless. 
Stem creeping or procumbent, irregularly 
branched ; leaves subsquarrose, spreading, 
ovate-lanceolate, acuminate, entire, nerved 
half way; capsule subcernuous; lid co- 
nical. Polygamous, . . , , 61, H. polygamum. 
