| 释义 |
mesarch
mesarch (ˈmɛsɑːk) adj (Botany) botany (of a xylem strand) having the first-formed xylem surrounded by that formed later, as in fern stems. Compare exarch2, endarch[C19: from mes(o)- + Greek arkhē beginning]mes•arch (ˈmɛz ɑrk, ˈmɛs-, ˈmi zɑrk, -sɑrk)
adj. 1. (of a primary xylem or root) developing from both the periphery and the center; having older cells surrounded by younger cells. 2. (of a life form) originating in a habitat with a moderate moisture supply. [1890–95] mesarch
mesarch[′me‚zärk] (botany) Having metaxylem on both sides of the protoxylem in a siphonostele. (ecology) Originating in a mesic environment. |