| 单词 | free central placentation |
| 释义 | free central placentation (once / 1688473 pages) n WORD FAMILY free central placentation USAGE EXAMPLESIn the flowers of Saponaria officinalis Dr. Masters has observed instances of both marginal and free central placentation. Darwin, Charles, The Origin of Species by means of N...(2010) n where ovules develop on a central column in a compound ovary lacking septa or with septa at base only Hyper placentation arrangement of the ovules in the placenta and of the placentas in the ovary |
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