236 FLORA OF NEW ZEALAND. [.Vaiadacea. 
1. Triglochin ¿riandrum, Mich.; foliis filiformibus scapum equantibus longioribusve vaginis fissis, 
floribus pedicellatis, fructu subgloboso, capsulis 3 dorso carinatis cum 2-8 sterilibus alternantibus dissepi- 
mentiformibus, stigmatibus brevibus recurvis. T. decipiens, Br. T.filifolium, Sieb. Hook. Ic. Pl. t. 579. 
T. flaccidum, A. Cunn. Prod. T. Montevidense, Spreng. Syst. Veg. T.tricapsulare, Banks et Sol. MSS. et Ic. 
Has. Throughout the Islands, in marshy places, often near the sea, common, Banks and Solander, etc. 
Plants everywhere quite glabrous, very variable in size, 3 inches to a span long. Leaves filiform, grassy, semi- 
terete, all radical, as long or longer than the scape. Racemes of very minute, green, pedicellate flowers. Fruit 
orbicular, angled, of three-keeled carpels, alternating with as many or fewer abortive ones. Stigma short, recurved. 
—Abundant in Australia and Tasmania, the Cape of Good Hope, and extra-tropical North and South America. 
Gen. II. POTAMOGETON, L. 
Perianthium 4-partitum. Stamina et ovaria 4. Capsule 4, evalves, 1-spermze; embryone curvato. 
Glabrous water-plants, found in most temperate latitudes, many species of which are scattered over various 
parts of the globe. Stems elongated, branched. Leaves with often ochreate stipules, grassy and linear, or broad 
and petiolate, submerged or floating; sometimes the submerged ones differ from the others. Flowers sessile in 
terminal or axillary spikes, on peduncles which rise from a membranous spatha, green. Perianth of four pieces- 
Stamens and ovaries four. Stigmas sessile. Carpels one-seeded, dry, indehiscent. (Name from moropos, a river, 
and yerwv, a neighbour. 
Y > 
1. Potamogeton natans, L.; foliis natantibus petiolatis elliptico-oblongis lanceolatisve utrinque rotun- 
datis acutisve. Linn. Sp. Pl. A. Cunn. Prodr. Eng. Bot. t. 1822. 
Has. Northern and Middle Islands, 4. Cunn., ete. (A native of England.) 
One of the commonest European and North American water-plants, also found in India, Australia, Tasmania, 
and South America. Leaves petiolate, 13—3 inches long, floating, oblong or elliptic lanceolate, generally rounded at 
both ends; lower submerged leaves sometimes narrow and linear. 
2. Potamogeton ocreatus, Raoul; “ foliis linearibus apice rotundatis truncatis v. emarginatis viridibus 
internodio duplo longioribus, stipulis ochreatis membranaceis apice fimbriato-laceris, pedunculis erectis, 
spica oblonga." Raoul, Choiw de Plantes, p. 13. t. 6. 
Has. Middle Island. Akaroa, Raoul. / 
I never saw this plant, which seems, according to M. Raoul's description and beautiful plate, to be the common 
P. gramineus, found in many parts of the world, including Australia and Tasmania. It may be recognized by the 
linear, grassy, blunt leaves, 23-3 inches long; and the membranous sheathing tubular stipules, with a fimbriated 
mouth. 
Gen. III. RUPPIA, Z. 
Flores hermaphoditi, pauci, spicati. Perianthium 0. Stamina 4; antheris l-locularibus. Stigma 
indivisum. Achenia 4, pedicellata, 1-sperma. 
A very remarkable plant, found in Tasmania and many parts of the world, in salt or brackish water, submerged 
and partially floating. Stems filiform, branched. Leaves linear, setaceous, with (often inflated) sheaths. Flowers 
minute, two together, distant; buds on a spadix or peduncle, which is first included in the sheath, afterwards 
elongated and spirally twisted. Perianth 0. Stamens four, sessile on the spadix; anthers one-celled; pollen a 
curved tube, with 2-3 contained globules. Ovaries four little tubercles. (Named after Henry Barnard Ruppius, 
author, in 1718, of a ‘ Flora Jenensis.’) 
1. Ruppia maritima, L. Eng. Bot. i. 136. 
Has. Northern Island, frequent. Sinclair, ete. (A native of England.) 
