Annals of the New York Academy of Sciences, Volume 10 (Google eBook)

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New York Academy of Sciences, 1898 - Science
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Page 18 - Pursh. the bud-scales are described as consisting of the dilated base of the petiole, the lamina being represented by a small black point. " One or two succeeding leaves bear a small lamina sessile on the sheath, which is wholly adnate to the thin, dilated base of the petiole and membranous, especially outside of the three vascular bundles. The next one or two have a welldeveloped lamina, and the sheaths partly separated from the petiole and corresponding to stipules. Farther up the stipular sheaths...
Page 3 - Introduction to Botany, 99. 1832. The following statement is of interest : " The exact analogy of stipules is not well made out. I am clearly of opinion that, notwithstanding the difference in their appearance, they are really accessory leaves ; because they are occasionally transformed into leaves, as in Rosa bracteata, because they are often indistinguishable from leaves of which they obviously perform all the functions, as in Lathyrus, and because there are cases in which buds develop in their...
Page 11 - Duval-Jouve, J. — Sur quelques tissues de Joneses, etc. Bull. Soc. Bot. Fr. 18 : 231-239. 1871. The presence of the ligule in the Juncacea? is treated of. To quote the author, " If in certain species the ligule is so reduced that it appears to be lacking between the separated auricles at the apex of the sheath, in most others these auricles are united by a true ligule, as pronounced as that of grasses, either entire or cleft at the middle.
Page 10 - ... It is argued from the similarity of the sepals to the divisions of the involucre (stipulium) and also to the stipules of the fully developed foliage leaves which is frequently observed, that they represent stipules. This is held to be true in many Geraniacese, Malvaceae, Begoniacese and Cistacese.
Page 34 - ... support for the ligular part and this usually splits, leaving apparently a single stipule opposite the leaf. The case of the tendrils of Smilax is one which has occasioned much discussion, but the embryological together with the anatomical characters make it sufficiently clear that in Smilax the tendrils are true stipules found in connection with the sheathing petiole. If a young shoot of Smilax rotundifolia L. be examined, the first leaf (fig. 35) is seen to be of the typical primitive form....
Page 307 - ... published to date. The price is one dollar per part. (4) The SCIENTIFIC SURVEY OF PORTO Rico AND THE VIRGIN ISLANDS (octavo series), established in 1919, gives the detailed reports of the anthropological, botanical, geological, paleontological, zoological, and meteorological surveys of these islands. Subscriptions and inquiries concerning current and back numbers of any of the publications of the Academy should be addressed to EXECUTIVE DIRECTOR The New York Academy of Sciences...
Page 14 - Primus), and those consisting of stipules (Liriodendron, Quercus). In Prunus, etc., the formation of the bud-scales by the union of petiole and stipules is denied on the ground that the continuous separate development of the petiole and stipules can be followed. The scales of rhizomes are divided into those formed by a development of the leaf-base (Dentaria, Chrysosplenium) and those formed by a modification of the upper-leaf (Labiatae, Onagracese).
Page 10 - Entwicklungsgeschichte des Blattes. 22-31, 1861 (Cited by Martin Franke in Bot. Zeit. 54 :45, 1896.) Stipules are said to arise without exception as a product of the leaf base of the primordial leaf. This mode of origin of the stipules is their chief characteristic. Their form, their more or less foliaceous condition and their persistence are secondary. In individual leaf development in the Stellatse, the whorl originates in a uniform ring about the growing point.
Page 46 - ... be supplied with veins either by the marginal bundles of the sheath or by tangential branches from those entering the blade. The sheathing petiole may disappear by degeneration, rendering the ligule axillary as in many species of Potamogeton. 3. The ochrea is related to the ligule and is generally associated with the sheathing petiole. It consists of the apical tissues developed in those cases where the sheathing petiole completely surrounds the stem or did so in the ancestral condition. The...
Page 151 - No case is known of an outer isomorphism which changes each conjugate set of operations into itself. On the other hand, it is still an open question whether or no such isomorphisms exist.

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