| 释义 |
pachycaul, n. (a.) Bot.|ˈpækɪkɔːl|
[f. pachy- + Gr. καυλ-ός stem, stalk.]
A tree having a thick primary stem and few or no branches; also attrib. or as adj. Hence pachyˈcaulous a.; ˈpachycauly, development of this type. Cf. leptocaul n. and a.
1949E. J. H. Corner in Ann. Bot. XIII. 392 The pachycaulous Cycad. Ibid. 393 The old clumsy pachycaul with massive and slow-growing branches. 1954Phytomorphology IV. 264/1 In general, six effects accompany the transition from pachycauly to leptocauly. 1964E. J. H. Corner Life of Plants ix. 154 ‘Pachycaul’ (with thick primary stem) denotes massive construction as of the rosette tree or cabbage tree. Ibid. 155 The pachycaul plants establish themselves by robust growth. 1967E. A. Menninger Fantastic Trees 16 (heading) The pachycaulous trunks. Ibid., One conspicuous example of this pachycaulous curiosity today in the forests of the Ivory Coast and Nigeria is the aky tree, also called the forest papaw. Despite its enormous size..this tree's trunk is soft, porous, and spongelike, and it is generally unbranched. It is a living relic of an ancient age. 1973A. J. Willis Introd. Plant Ecol. v. 55 A tendency to a pachycaul habit is seen in the ash, with its pinnate leaves and thick stubby twigs. 1974Kew Bull. XXIX. 535 The pachycaul Giant Lobelias are some of the most spectacular plants of the tropical African highlands. Ibid. 549 In herbaceous species [of giant lobelia]..the development is similar to that of the forest pachycauls. 1974New Phytologist LXXIII. 971, I propose a general hypothesis on the evolutionary trends involving pachycauly in Senecio. 1976Phil. Trans. R. Soc. B. CCLXXIII. 359 The purpose of this account [of climbing species of Ficus] is to provide new evidence for the general theory of angiosperm evolution from pachycaul to leptocaul vegetation. |