Journal of botany, British and foreign . a height of from sixto fourteen feet, with a diameter of six to eighteen inches,and a floral spike of from ten to nineteen feet. It is thusa most conspicuous plant, and lends a peculiarly weird aspectto the country it occupies. Its rate of growth is described asvery slow, old settlers having remarked but little change inindividual trees after thirty years observation. The most remark-able feature in the structure of the stem is the formation of a denseligneous central core immediately above and connected with theroots, exhibiting numerous annular zones,
Journal of botany, British and foreign . a height of from sixto fourteen feet, with a diameter of six to eighteen inches,and a floral spike of from ten to nineteen feet. It is thusa most conspicuous plant, and lends a peculiarly weird aspectto the country it occupies. Its rate of growth is described asvery slow, old settlers having remarked but little change inindividual trees after thirty years observation. The most remark-able feature in the structure of the stem is the formation of a denseligneous central core immediately above and connected with theroots, exhibiting numerous annular zones, traversed by transverse(medullary) fibres. The flowers are borne in a dense spike upon asmooth peduncle. Individually they are inconspicuous, of a whitishcolour, and develop a strong odour and abundant nectar during thewarmer part of the day, when they are visited and fertilised byhymeuopterous insects, the most remarkable being a large metallic-green Carpenter Bee (Xylocapa), which tunnels out cells m the deadflower-stalks. , H Morgan lith. Potamogeton ^ WestNe/vrrLSun 5^ 65 NOTES ON PONDWEEDS. By Alfhed Fryer. (Plates 286 & 287.) Potamogeton falcatus Diihi.—Stem rouucl, slender, springingfrom a tuberous rootstock; branched from near the base withdistant alternate ascending branches, the lower of which arepermanently submerged, the upper ultimately rising to the leaves alternate, amplexicfdd, flat, or slightly undulated at themargin, e)itire, rarely longitudinally folded and recurved; ellipticalstrap-shaped, gradually contracted from above the middle to thesomewhat rounded base; apex acute or acuminate; the midrib iscurved, and not quite central, so that many of the leaves arestraight on one margin and curved on the other: with one or tworows of elongate cancellate areolations along the midrib, on eachside of which are three lateral ribs connected by a few indistincttransverse veins. Upper leaves similar to the lower, amplexicaul
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