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Rh PUAXEROGAMIA. 113 labellum. Differences presented by the spur, its relative length, &c, are but slight in 0. Tenor eana ; in some other species, as 0. iiiorio, the spur is very variable in form. The author considers, with Koch, Orchis tridentata, Scop., and 0. variegata, All., to be specifically identical. 0. Tenoreana, Gu^s., he regards as distinct. Tomaschek, A. — Ueber die Eutwickehrngsiahigkeit der Bliithenkritzchen von Cor gifts avellana, L. — Verhdlgn. K. X. Z.-B. Gesollsehft. in Wien. Bd. ix., pp. 3-6. Nachtrag zur Phanerogamen-Flora Cylli's. — lb. Bd. ix., pp. 35-42. Zur Flora der Uingebung Lembergs. — lb. Bd. ix., pp. 43-54. Considerations upon the relations of the vegetation to the cha- racter of the soil, and to meteorological conditions. Treviraxtjs, L C. — TJeber den Wechsel des Griinen und Rothen in der Lebensaften belebter Korper. — Eot. Zeit. 1860, pp. 281-8. The author's observations apply, in the vegetable kingdom, chiefly to the red coloration of Alga3, Lichens, and autumnal leaves. Uloth, W. — Beitrage zur Physiologie der Cuscuteen. With 2 plates. — Flora, 1860, pp. 257-68, 273-81. The structure of the seed, its germination, the connexion between the parasite and its prey, &c, are minutely described. The author finds the embryo in Cuscuta compact a, vulgivaga, chilensis, and Ce- phalanti (referred by him to Cuscutina of Pfeiffer), to bear minute scale-like organs on its summit. The active growth and increase of the parasite commences with the formation of vascular tissue in the first cord of tissue penetrating the epidermal layers of its prey. When these " suckers" penetrate any part of the parasite itself, as frequently occurs, no formation of vessels takes place. M. Chatin's account (Anat. Comp. des Veget., Livr. iii.) of the parasitism of Cuscuta, and his elaborate drawings, appear to be unknown to the author. Tornabene, F. — Monografia delle specie di Asparagus spontanee sulT Etna. 4to. Catania. 6 plates. Sopra un nuovo albero indigeno sull' Etna del genere Celt is. — Catania. 4to. Walpers. — Annales Botanices Systematica?. Tom. v., Fasc. vi. From Taxinese to end of Monocotyledons ; with Index to the volume. Wawra, H. and J. Peyritsch. — Sertum Benguelense. Aufzahlung und Beschreibung der auf der Expeditionsfahrt Sr. M. Corvette " Carolina" an der Kuste von Benguela von Dr. H. Wawra gesam- melten Pflanzen. Wien, 1860. (Wien Ber. Vol. xxxviii.) 46 pp'. The " Carolina" touched at Benguela on the return voyage from the Cape, remaining but six days (from 21st to 28th January). On two excursions, made under very unfavourable circumstances, Dr. W. collected 53 species, of which he finds about half to be unde- scribed. A short account of the town of Benguela, the vegetation of its neighbourhood, and of the Benguelese, is prefixed to the list of species met with. This latter includes diagnoses and lengthened VOL. I — N. H. R. Q