8. TYPHA. Z.
1. T. latifolia. L .—Ph. Am. 1. p. 34. E. Bot. t. 1455. Rich. App. p. 34.
Hab. Throughout Canada to Fort Franklin. Dr Richardson. N. W. Coast, Straits of de Fuca. Dr
Scouler.—I have not seen the T. angustifolia, L., from British N. America, but it seems not uncommon in
the United Slates.
O r d . V. SAURURE.ZE. Richard.
1. SAUE.UB.US. L.
1. S. cernuus. L .—Ph. Am. 1. p. 252.
H ab. Canada. P h.; but I have seen no specimen.
Ord. VI. NAIADES. Juss.
1. NAIAS. Z.
1. N. Canadensis (Mich. Am. 2. p. 220); parva repetitim dichotome ramosa csespi-
tosa, foliis fasciculatis oppositis membranaceis linearibus uninerviis subintegerrimis, stylo
apice bi-trifido. (Tab. GLXXXIV.)-—Ph. Am. 2. p. 602.
H a b . Canada (in Lake St John’s. Michaux). Mr Cleghom.—A densely tufted plant, readily distin-
guished from the European species of the same genus, by the nearly entire leaves and the often bifid style.
My specimens are female only. It is singular that this plant does not appear to be found by any of the United
States botanists. I do not know what the Caulinia fragilis and flexilis of the American Floras are, unless
the latter be, as I suspect, the n. 436 of Drummond, 3d Coll, of Texas plants; but our plant does not correspond
with that.
Tab. CLXXXIV. Fig. 1, Portion of a female plant; f. 2, Leaf; ƒ. 3, Female flower; f. 4, Fruit;
f 5, The same laid open, showing the seed :—magnified.
(Zostera is a native of the United States, but I am not aware that it has been gathered in the British
possessions, though there is every reason to suspect its existence there; and probably that of the Caulinias
too, especially in Upper Canada.)
2. ZANNICHELLIA. Z.
1. Z. palustris. L .—Ph. Am. 1. p. 4. E. Bot. t. 1844.
H ab. N. W. America. Columbia River. D r Scouler.
| RUPPIA. Z.
1. R. mafitima. E.—Ph. Am. 1. p. 121. E. Bot. t. 136.
H ab. N. W. America. In still bays of the Columbia. Douglas. Dr Scouler.
4. HETEROSTYLUS. Nov. Gen.
Dioicus? M asc. — ?—F cem. Spadix e spatha (foliorum basi) erumpens, exserta,
floribus nudis undique insertis sessilibus; superioribus arctis, subimbricatis stylo brevi;
inferioribus sensim magis remotis stylo longiori; infimo radicali stylo filiformi longis-
■ s‘mo • Stigma simplex capitatum. Germen lanceolatum compressum bialatum, dorso
carinatum. F ructus: Achenium oblongum compressum, utrinque subalatum; infimum
superne bidentatum.— Herba annua ? aquatica, maritima f.vel salsuginosa, oroe occidenta
ls America borealis. Radix fibrosa fibris simplicibus. Folia radicalia graminea mem-
branacea, tenera, striata, linearia, 6-8-uncias longa, basi vaginantia, spathacea.
1. H. gramineus. (T ab. CLXXXV.)
H a b . Wet plains of the Columbia. D r Scouler.—-This is an extremely curious plant, and certainly the
type of a new genus, to which I have assigned the present name, from the remarkable circumstance of the
female flowers or pistils (for they are perfectly destitute of any kind of floral Covering); of the extremity of the
spadix, having a short style, those about the middle a longer one, and those at the base, especially among
the roots, where the spatha ,and the spadix have their origin, with a style-two inches .and more long, slender
and filiform! It is to be regretted that very few specimens were preserved, and those having, as far as can
be seen, only female flowers.
T a b . CLXXXV. Fig. 1, Spadix and spatha ; ƒ. 2, 3, 4, Female flowers; ƒ 5, Fruit; ƒ 6,: The same
laid open ; f. 7, Seed :—magnified.
'5. PHYLLOSPADIX. Nov. Gen.
Dioicus ? M asc. ? F cem. Spadix e spatha curvata (foliorum basi) inclusa, canaliculata,
hinc supra florifera, marginibus foliiferis, foliis seu squamis oblongis-subimbricatis;
floribus nudis, serie singula subimbricatis, sessilibus. Ovarium sessile, lato-ovatum, sub-
globosum. Stylus breviusculis, crassus. Stigma capitatum. Fructus — ?__Herba ora occidental
America borealis, aquatica,, radice nodosa fibris albidis, veterum foliorum reliquiis,
vestita. Caules breves vaginali. Folia linearia, elongata, graminea,, subcoriacea, siccitate
nigi escentia, nervosa, obscure costata, integerrima. Spatha lata, convoluta, curvata, spadi- cem includens.
1. P . Scouleri. (T ab. CLXXXVI.)
H a b . Dundas Island in the-Columbia River, N. W . America. Dr Scouler.— This is a second new genus
of Naiades which has rewarded Dr Scouler’s researches in the north-west shores of America. Its nearest
affinity is doubtless with Zostera, from which the separated male flowers, the single style and stigma, and the
curious leafy border to the spadix, will at once distinguish it.
T a b . CLXXXVI. Fig. I , Spatha, including the spadix ; ƒ 2, Side view of the spadia removed from
the spatha; ƒ. 3, The same, front view, the margins spread open; ƒ. 4, Spatha, from which the spadix has
been removed ; ƒ. 5, Single pistil:—more or less magnified.
6. POTAMOGETON. Z.
1. P. natans. L . Ph. Am. 1. p. 1,20. E. Bot. t. 1832.—/3. foliis minoribus angustis acutis. v
H ab. Stagnant waters, Canada. to Hudson’s Bay.-—A. N. W. America. Mr Menzies.