Page:Natural History Review (1861).djvu/118

106 Æchmandra, of Arnott. M. Naudin maintains, that in the great majority of the Cucurbitaceæ, the stamens are three in number, two being entire and bilocular, and one reduced to a half, and thus unilocular. Among the nineteen genera enumerated and described in detail in this paper, is the new genus Peponopsis, founded upon female plants (of Mexican? origin), cultivated in the Jardin des Plantes. The embarrassed synonymy of the species known to M. Naudin in cultivation, is fully worked out, and extended observations are appended to those of special interest.

—Genera Plantarum Floræ Germanicæ iconibus et descriptionibus illustrata.—Fasc. xxxi. Genera plura Familiæ Caryophyllacearum cum nonnullis Compositorum et Saxifragacearum (by A. Schnizlein).—Bonnæ, 1860, with 20 plates.

—Ueber die Vegetations verhältnisse der aufzulassenden Festungswerke Wien's.—Verhandgln. zool.-bot. Gesellsch. Wien. Bd. ix., pp. 167–76.

An enumeration is given of the species growing upon the bastions, glacis, ramparts, and in the moat; those which are abundant, also species of fortuitous and transitory occurrence, &c, are severally indicated.

, Dr. T.—Wachsthumsverhältnisse des rundblättrigen Sonnenthaues.—Botanische Zeitung, 1860, pp. 57–61, 65–69.

Drosera rotundifolia propagates itself both by seed, and by the formation of axillary and adventitious buds. The author remarks the great frequency of the latter mode of multiplication. The adventitious buds only develope upon leaves, especially upon old ones which are about to separate, or upon those already fallen, which are kept moist by surrounding Sphagnum. The author's observations apply principally to the development of the internodes, "rosettes," and the resting winter buds.

Ueber die Reizbarkeit der Blätter von Drosera rotundifolia, L.—Botanische Zeitung, 1860, pp. 229–34, 237–43, 245–50.

The sensibility to irritation, Dr. Nitschke finds common to the entire surface of the leaves and their glandular appendages. When irritated, both the glands and the lamina itself curve towards the source of irritation. The degree of susceptibility of the leaf to irritation is proportionate to the activity of its secretions, and is dependent on the process of assimilation. Old or undeveloped leaves, which do not form glandular secretions, do not either manifest irritability. The author states the leaves to be unaffected by the presence or absence of light—they have no "sleep."

—Natuurlijke Historie van Nederland.—De flora van Nederland, Parts 7, 8, 9. 8vo. Haarlem, 1860.

—Die Schimper'schen Pflanzen aus Abyssinien, nach der Bestimmung von A. Bichard im tentamen Fl. Abyss, zusammengestellt.—Flora, 1860, p. 289–303.

The species are arranged in the sequence of the natural orders, the distribution numbers being quoted.