106 BIBLIOGRAPHY. 



JEchman&ra, of Arnott. M. JSaudin maintains, that in the great 

 majority of the CucurbitaceaB, the stamens are three in number, two 

 being entire and bilocular, and one reduced to a half, and thus uni- 

 locular. 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. 

 JNaudin in cultivation, is fully worked out, and extended observa- 

 tions are appended to those of special interest. 



Nees ab Esenbeck, Th. Fe. Ltjd. — Genera Plantarum Florae Germa- 

 nicae iconibus et descriptionibus illustrata. — Fasc. xxxi. Genera 

 plura Familiaa Caryophyllacearum cum nonnullis Compositorum et 

 Saxifragacearum (by A. Schnizlein). — Borinse, 1860, with 20 plates. 



Neilbeich, August. — TJeber die Vegetations verhaltnisse der aufzulas- 

 senden Festungswerke Wien's. — Yerhandgln. zool.-bot. Gesellsch. 

 "Wien. Bd. ix., pp. 167-76. 



. An enumeration is given of the species growing upon the bas- 

 tions, glacis, ramparts, and in the moat ; those which are abundant, 

 also species of fortuitous and transitory occurrence, &c, are severally 

 indicated. 



Nitschke, Dr. T. — Wachsthumsverhaltnisse des rundblattrigen Son- 

 nenthaues. — Botanische Zeitung, 1860, pp. 57-61, 65-69. 



Drosera rotundifolia propagates itself both by seed, and by the for- 

 mation 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 prin- 

 cipally to the development of the internodes, " rosettes," and the 

 resting winter buds. 



TJeber die Reizbarkeit der Blatter von Drosera rotundifolia, L. 



—Botanische Zeitung, 1860, pp. 229-34, 237-43, 245-50. 



The sensibility to irritation, Dr. Mtschke finds common to the en- 

 tire surface of the leaves and their glandular appendages. When irri- 

 tated, 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." 



Oudemans, T. A. — Natuurlijke Historie van Nederland. — De flora van 

 Nederland, Parts 7, 8, 9. 8vo. Haarlem, 1860. 



PALACxr, Db. — Die Schimper'schen Pflanzen aus Abyssinien, nach der 

 Bestimmung von A. Bichard im tentamen Fl. Abyss, zusammenge- 

 steUt— Flora, 1860, p. 289-303. 



The species are arranged in the sequence of the natural orders, 

 the distribution numbers being quoted. 



