. A textbook of botany for colleges and universities ... Botany. Figs. 958-960. — 958, tendrils of a wild cucumber {Echinocystis lobata-)\ note the reverse directions of the spirals, those at / being dextrorse apd those at t' sinistrorse; note also the coiling of the tendril ends about the support; 959, 960, tendrils of Cobaea scandens: 959, a compound leaf with three pairs of leaflets and a terminal dichotomously branched tendril; 960, the tip of one of the tendril branches considerably magnified, showing the recurved hoolu which hold the plant to a support. the lower part of a coil appears a
. A textbook of botany for colleges and universities ... Botany. Figs. 958-960. — 958, tendrils of a wild cucumber {Echinocystis lobata-)\ note the reverse directions of the spirals, those at / being dextrorse apd those at t' sinistrorse; note also the coiling of the tendril ends about the support; 959, 960, tendrils of Cobaea scandens: 959, a compound leaf with three pairs of leaflets and a terminal dichotomously branched tendril; 960, the tip of one of the tendril branches considerably magnified, showing the recurved hoolu which hold the plant to a support. the lower part of a coil appears at the right and the upper part disappears at the left, the twiner is called dextrorse (as in the hop). Common native twiners are the bittersweet (Celastrus) and the dodder {Cuscutd), the latter being a parasite in which contact stimulation incites the develop- ment of sucking organs (haustoria) that serve also to hold the climber firmly to • the supporting plant. In twiners and , g Q in other lianas there is a striking development of conductive tissues (p. 689). Tendril climbers. — Scarcely second to twiners in specializa- tion are the tendril climbers, the tendril commonly being an organ homologous with leaves or leaflets (figs- 959. 960, 939, 943), or with branches (as in the passion flowers and grapes, figs. 961, 962); or tendrils may be organs of doubt- ful homology (as in the pumpkin. Figs. 961-963. — Tendrils of the Japan ivy {Psedera tricuspidata): 961, a portion of a stem, showing a young tendril (/), the branches having small globular swellings {s) at the tip; 962, a similar tendril at maturity, the swollen tips {s') being much larger, and also flattened on the side in contact with the support; 963, a mature tendril tip, somewhat magnified, showing the adhesive disk (d), which may fasten even to a smooth Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearanc
Size: 1973px × 1266px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910
