146 THE JOURNAL OF BOTANY 
P. similis, nov. sp. Section Veeee) Heterophyllii Koch. 
Stem aan sparingly branched, rather slender. Lower leaves 
membrana ceous, linear- lane eolate, a ttonnated into the petiole, and 
semi-acute; 3-5-nerved, ae sitieal with a band of elongated 
caniculate areolation. Upper leaves soHiisbactis, rotund- pea bce 
or oval, with five principal, bade ight secondary nerves, and very 
numerous cross-veins. Stipules blunt, very thin and translucent, 
soon — ing. arr gaa tee ite in the middle. Spikes with 
nu s flowers, the majority of which are fertile. Fruit com- 
prediod- paborbioular with a short style, tricarinate with the three 
margins sinuous-winged ; two ers ~ at the ne of the ventral 
face. Stems 4-12 in. Leaves 10 lin. | ong X n. broad ; sub- 
merged 24 lin. x 2-3 lin. b so Stipules _. ger fibres by 
the — of flowering. Spikes 7 to 9 lines. 
-Swan River, W. Australia; Drummond, no. 117, Re 
an. va Tasmania : Swanport, Dr. Story, ex F. Mue 
Lagoon, York ci near Outlands, H ai Boissier 
This species may be contrasted with P. Dr sumsnoniits Bentham, 
and P, teak Muell. & Bennett. The first holds a middle 
place between these two species, though not really like iter of 
them; approximating more towards P. tricarinatus. I have had this 
plant t befor ore me for some years, but I cou ld not decide on its grade. 
tween the two American species, P. amplifolius Tackerm. an 
P. pulcher Tuckerm. This analogy or likeness is so great in some 
cases, that specimens are often cross-named by American bokeniata 
as Dr. oe acu d to ar 
e genus comes to be better understood and studied, 
these rote pet of ‘ikene ess (pet dissimilarity) will be found to be 
very interesting, a A ey ead up to some peculiar questions: of 
the above two American species I can extend the distribu- 
tion slightly beyond that given by Dr. Morong. Of P. pulcher I 
have seen specimens from Florida, Rugel (as natans) in Hock Mus._ 
Brit., and Kentucky, C. W. Short, 1842, in Herb. Vindob., though 
Occurring in Ms mt it is curious it has not yet been found in 
Canada. P. aomplifolins occurs westward to Oregon, Hall, No. 4 488a 
as P, rufescens Schrad.”’), and i soy to Florida; Chapman, 
1844, as ‘* P, natans ae in Herb. Boissi 
_ Rev. J. O. Hagstrém has ce a new species of Pota- 
mo: : P. linguatus, in Dusen’s Kent. d. Gefissfp. ng sudliches 
Paiagoetais (Oversigt af Kongl. Vet. Akad. Forhand. No. 4, p. 259- 
