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 upivards. 



45. Potamogeton lanceolatum. — Anglesea, July 12, 1826. — 

 Growing- in a small rivulet, with a moderatelv 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, 1-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. Embryo erect, with a narrow 

 plumule (?) at the apex, at whose base, externally, appears 

 a small round body, the use of which I cannot understand. 



47. Sagina maritima. — Anglesea, June, 1828. — Leaves 

 quite blunt, rounded at the back, not keeled. Ca(?/a;-segments 

 blunt, inner ones membranous at the edges. Capsule shorter 

 than the calyos, with a broad base, stalked. 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. 

 Enibryo curved, lateral. 



Specimens from the neighbourhood of Warrington, Liver- 

 pool, Isle of Man, &c. confirm the above account. 



48. Sagina apetala. — 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 distinct species, as I had previously thought, 

 from having found that the seeds refused to grow in the 



