Vallisneria. | CXVIII. HYDROCHARIDE. 259 
: e genus is reden distributed over the tropical and temperate regions of the New 
as di as fe d World, the Australian species vi one the one most, common over the 
spir 
long and narrow when the water is deep, sh btuse 
9r acute and more or less serrulate at the .« a | with minute teeth, or 
| 
| 1l. V. spiralis, Linn. Sp. Pl. 1441. Ionen pim ag empor. , Very 
sometimes perhaps quite entire. Male spathes about 3 lines long, on 
ovary down to the bottom to mature. Perianth very small but larger 
than in the males. nnnc spathe only slightly enlarged. eh 
Mem. M Fr. 1811, t. 3; Reichb. Ie. FÌ. Germ. t. 60; Hook. f. Fl. 
Tasm. ii. 87; V. s spiralis is and V. na nana, R. Br. Prod. 345. 
r. E Albert and Roper rivers, F. Mueller; Arnhem's Land, R. Brown. 
q Queensland. Burnett river, F. Mueller ; een Cleveland and T" 
4 m W. DR Fitzroy river, O' pcena — fee 
i ictoria. Wendu ri obertson rarest Tambo, Mitta-Mitta, and Miri rivers, 
P ller. 
$ ^8 asmania. common in the BTN uk river, Gunn. 
S. Australia. CUT river, 
The Australian fbesinens I aj seen prove to be all pps I have described the 
males from European ones. Brown's V. nana was founded o warf narrow-leaved 
c ie ome other cou The Haves of his specimens are 
as described by him mostly acute and all quite entire, but one or two are obtuse, and 
larger forms fro Ne se es, Victoria, and T ia the shorter sub- 
erged leaves are somet mes acute, and occasiona lly, whether Misc n or ace without 
‘anther ers. Female wis dd with a jet filiform tube above the ov 
cylin 
herbs with —— hing stems and short verticillate ERU Spathe 
ils. 
.. The genus is rest C to the single species common in still and slowly 
ET nu T em abi gets n regions i pe Old World, the Australian 
form being the typical des NIU di de iui MES from 
, l. H. verticillata, Cusp. in Monatsber. Akad. 1857. Stems 
E^ throughout, much branched and Boating de. water 4 large 
