| 单词 | alternate-pinnate |
| 释义 | > as lemmasalternate-pinnate alternate-pinnate adj. [perhaps after French alternati-penné (1816); compare slightly earlier alternipinnate adj. at alterni- comb. form ] Botany having the pinnae or leaflets of a compound leaf alternate upon the midrib or petiole; (of leaf venation) consisting of a series of lateral branches arising alternately on each side of the midrib. ΚΠ 1859 T. Moore Brit. Ferns I. 77 Venation of the pinnules consisting of a slightly flexuose midvein from which branch a series of alternate pinnate veins. 1908 N. L. Britton N. Amer. Trees 588 They have alternate pinnate leaves with numerous small alternate leaflets readily detachable from the leaf axis when dry. 1977 Amer. Jrnl. Bot. 64 1273/2 Each pinna has three to four orders of alternate pinnate subdivisions which ultimately bear sporangia. < as lemmas |
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