| 单词 |
leptocaul |
| 释义 |
leptocaul, n. and a. Bot.|ˈlɛptəʊkɔːl|
[f. lepto- + Gr. καυλός stem, stalk.]
A tree having a relatively thin primary stem and branches; also attrib. or as adj. Hence leptoˈcaulous a.; ˈleptocauly n., development of this type. Cf. pachycaul.
1949E. J. H. Corner in Ann. Bot. XIII. 392 Leptocauly. I use this name to indicate the modern tree with relative[ly] slender primary axis and branches in contrast with the pachycaulous cycad. Ibid. 393 The leptocaul, or modern tree, thus comes to dominate in height and spread and distribution.., forming the modern forests. 1964E. J. H. Corner Life of Plants ix. 154 ‘Leptocaul’ (with thin primary stem) denotes the slender willow construction. Ibid. 155 Leptocaul plants predominate in temperate and subtropical climates. Ibid. (caption) Difference between pachycauly and leptocauly as shown by sections of the young twigs of figs. Ibid. xv. 275 Some of the herbaceous forms relate, like the banana, directly to the pachycaulous, others to the leptocaulous. 1973F. Ehrendorfer in V. H. Heywood Taxonomy & Ecology xvi. 319 There is evidence for repeated changes from little-branched monopodial and pachycaulous types..to strongly branched, sympodial, leptocaulous, growth-forms. 1974New Phytologist LXXIII. 977 Leptocauls do not become pachycaul on islands. |
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