50 THE TASMANIAN FLORA. 



leaves 5-I incli long, broadly ovate. Flowers, the staminate ones with scarcely- 

 perceptible sepals, well-developed petals, and 8 stamens ; pistillate ones without 

 any perianth. 



Risdon and other rivulets running into the Derwent, Huon, George's Bay, 

 George Town, &c. ; also in South Australia, Victoria, and New South Wales, 

 and New Zealand to South America. Fl. Nov. 



2. M. VARiiFOLiUM, S. A few inches to 1-2 feet. Leaves in whorls, usually 

 of 5 or 6, submerged ones 1 inch, divided into filiform lobes, aerial leaves 

 linear, \ inch long. In the staminate flowers the sepals are small but apparent. 

 Petals well-developed. Stamens 8. Pistillate flowers as in the last. 



Very common in fresh water ; also throughout Australia and New Zealand. 

 Fl. Nov. 



3. M. AMPHIBITJM, Lab. Small, creeping, 3-4 inches. Leaves opposite, oblong, 

 entire, .3 lines long. Staminate flowers with minute sepals. Petals narrow, I 

 line long. Stamens 8. Pistillate flowers very small. Calyx obsolete. Petals 

 none. Fruit smooth or nearly so. 



Recherche, Southport, &c., in mud ; also in South Australia and Victoria. 

 Fl. summer. 



4. M. PBDDNCULATtJM, S. Very similar to the last, only the leaves smaller, and 

 narrow-linear. Flowers smaller, the staminate ones sometimes stalked. Fruit 

 rough. 



Very common, especially in muddy pools, at a considerable altitude ; also 

 Southern Australia and New Zealand. Fl. Nov. 



. M. iNTEEGRiFOLiijM, S. Very small, depressed, and ascending. Leaves 

 alternate, linear,, 1-2 lines long. Staminate flowers minute. Sepals obsolete. 

 Petals ^ line long. Stamens 4. Pistillate flowers without perianth, j line long. 

 Probably only towards the North Coast, possibly overlooked elsewhere ; also 

 hroughout extra-tropical Australia. Fl. spring. 



4. GUNNERA. 



Flowers mostly unisexual. Sepals 2-3, minute. Petals none. Stamens 2. 

 Pistil of 1 1-seeded carpel. Styles filiform, 2. Fruit a minute drupe. 



Widely distributed in cool soathern climates; not appearing on the mainland 

 of Australia. 



G. COEDIFOLIA, S. Small, creeping by stolons. Leaves numerous, tufted, long- 

 stalked, broadly cordate, dentate on the margin, 1 inch long. Staminate flowers 

 arranged in clusters towards the end of a common erect stalk, minute. Pistil- 

 late flowers numerous, in a spherical head, on a very short common stalk. Fruit 

 about 1 line long. 



In alpine situations in northern and central districts. Fl. Nov. 



5. CALLITRICHE. 



Flowers unisexual. Perianth quite absent. Male flower of a solitary stamen ; 

 female of 4 blended 1-seeded carpels. Styles 2. Fruit flat, with a double rim. 



An anomalous genus, placed here by Mueller and Bentham, but made an 

 independent order by the former in his " Census" ; also, in his " Flora of the 

 British Isles," Bentham places it between the Euphorbias and Nettles. Other 

 botanists place it in Ewphorbiaceee. 



C. VEENA, lAnn. Small, floating or creeping. Leaves opposite, shortly 

 stalked, oblong, 2-6 lines long, or, when submerged, narrower. Flowers minute, 

 usually 2 together, sessile in the axils. 



Very common in fresh water ; also throughout Australia and New Zealand 

 Generally distributed through most parts of the world. Fl. Nov. 



