On Buds and StipulesK. Paul, Trench, Trübner & Company, Limited, 1899 - 239 pagini |
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Pagina 6
... become ripened and brown . The middle line of the sheath-- that is , the line of junction of the two leaves - becomes brown with age while the thicker portion is still green . In other plants , as in Stachys ( fig . 6 ) , the leaves do ...
... become ripened and brown . The middle line of the sheath-- that is , the line of junction of the two leaves - becomes brown with age while the thicker portion is still green . In other plants , as in Stachys ( fig . 6 ) , the leaves do ...
Pagina 17
... become quiescent , and are gradually covered over by the bark . Such buds are known as ' dormant . ' They may remain in the same state for years , but if the growing shoots are injured in the struggle for existence these reserves are ...
... become quiescent , and are gradually covered over by the bark . Such buds are known as ' dormant . ' They may remain in the same state for years , but if the growing shoots are injured in the struggle for existence these reserves are ...
Pagina 44
... become leathery , and thus protect the inner ones ; this is the case with V. Opulus . But that being so , it is an advantage that the inner or true leaves should be folded , because they thus occupy less space . This , perhaps ...
... become leathery , and thus protect the inner ones ; this is the case with V. Opulus . But that being so , it is an advantage that the inner or true leaves should be folded , because they thus occupy less space . This , perhaps ...
Pagina 47
... and almost cover over the growing - point . They gradually elongate ( fig . 61 ) , and from being at first slightly curved round the stem , become folded lengthways or con- duplicate DEVELOPMENT OF LEAVES AND STIPULES 47.
... and almost cover over the growing - point . They gradually elongate ( fig . 61 ) , and from being at first slightly curved round the stem , become folded lengthways or con- duplicate DEVELOPMENT OF LEAVES AND STIPULES 47.
Pagina 48
Sir John Lubbock. round the stem , become folded lengthways or con- duplicate . They are clothed with long , sparse hairs , and show a few teeth , or rather knobs , along the edge , one terminating each of the veins , which are thicker ...
Sir John Lubbock. round the stem , become folded lengthways or con- duplicate . They are clothed with long , sparse hairs , and show a few teeth , or rather knobs , along the edge , one terminating each of the veins , which are thicker ...
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Termeni și expresii frecvente
apex axil axillary buds axis base Beech blade brown bud is protected bud-scales Candolle completely covered concave conduplicate connate stipules cotyledons developed edges Edition Exochorda exstipulate fifth folded foliaceous fourth genera genus glabrous glands growing-point growth Guaiacum officinale hairs hairy Helianthemum Hornbeam Horse Chestnut inner instance lamina Lantana lateral buds Lathyrus Aphaca Lathyrus Nissolia leaf leaf-base leaf-blade leaf-stalk leaflets length less lobes lower membranous midrib Monocotyledons narrow node ocrea Opulus outer scales ovate pair of leaves pair of stipules pedestal persistent petiole Petteria PLANE Platanus plant Polygonum protect the bud protect the young Robinia scale fig scar sheath shoot showing side slightly Smilax sometimes species St FIG St St stalk stem stipular stipules belonging stipules fig stipules St subulate tendrils terminal bud trees triangular Tulip Tree upper Viburnum Viburnum Lantana Viburnum Opulus Whitebeam winter winter-bud Wych Elm young bud young leaves younger
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Pagina 233 - So careless of the single life, So careful of the type she seems, and will be more and more struck with wonder and admiration at the variety and beauty of the provisions by which Nature preserves these tender and precious buds from the severity of winter, and prepares with loving care and rich profusion for the bright promise of spring and the glorious pageant of summer.
Pagina 194 - ASSISTANCE IN CLIMBING There are two ways in which stipules may assist in this respect, viz. (1) by being developed into tendrils, or (2) into more or less reversed spines. The case of the tendrils of Smilax is one which has occasioned much discussion, but I agree with Tyler (24) that the embryological, together with the anatomical, characters indicate that in Smilax the tendrils are true stipules, found in connection with the sheathing petiole. In Paliurvs australis (fig.
Pagina 4 - The figure also shows how admirably the peculiar form of the leaf is adapted to their mode of growth. In many other plants also the leaves, as they develop, successively protect the younger ones. A somewhat similar case is afforded by Uvaria (figs. 105, 106, p. 70) ; and also by common Rhubarb, FIG.