* 140 
but arise from various parts of the central rib; some of them 
one-third the length of the leaf from its base; they are from 
six to seven in number on each side, two of them more 
evident than the rest; flower-stalk not thickened upwards. 
45. Potamogeton /anceolatum.— Anglesea, July 12, 1826.— 
Growing in a small rivulet, with a moderately swift stream; 
floating leaves are always found where the current is slow. 
The chain-like reticulations near the mid-rib are only dis- 
tinguishable on the lower leaves, the floating ones being 
elegantly overspread with them; the floating leaves appear 
to be stalked,—stipules not distinctly acute. 
46. Ruppia maritima.—Anglesea, July 1826 and 1828.— 
The seeds ripen under water, but the flowers are all raised above 
the water at the time of impregnation, the flower-stalk having 
been elongated for that purpose. I observed the fruit-stalk to’ 
be much longer than described in Eng. Fl. Anthers sessile, 
attached by their centre only, I-celled. Pollen oblong, curved, 
consisting of a tubular membrane, inclosing three globules, 
the intermediate spaces, when dry, much contracted. At the 
base of the flower-stalk is seen a lanceolate, flat, membranous - 
scale, of its own length.  Zmbryo erect, with a narrow 
plumule (?) at the apex, at whose base, externally, appears 
a small round body, the use of which I cannot understand. - 
. Sagina maritima.—Anglesea, June, 1828. — Leaves 
dis biting rounded at the back, not keeled. Calyx-segments 
blunt, inner ones membranous at the edges. Capsule shorter 
than the calyx, with a broad base, ételked. No trace whatever 
of petals. More upright in growth, and the stems more glossy 
than in S. apetala, and the flowers, fruit, and seeds larger. 
Embryo curved, lateral. 
Specimens from the neighbourhood of Warrington; Liver: — 
E Isle of Man, &c. confirm the above account. 
48. Sagina upetala.—Variety. —Beamaris, Anglesea, June, 
1828.—This variety, growing in situations where S. maritima 
is usually found, and much resembling it, proves S. maritima 
to be a really “disti inct species, as I had previously thought 
ing found that the seeds refused to grow in the 
