| 释义 |
orthotropous, a. Bot.|ɔːˈθɒtrəpəs|
[f. mod.L. orthotrop-us, a. Gr. type *ὀρθότροπ-ος, f. ὀρθο- straight + -τροπ-ος turning, turned + -ous. Cf. mod.F. orthotrope.]
a. Of an ovule: Having the nucleus straight, i.e. not inverted, so that the micropyle is at the end opposite the base: = atropous.
b. Of an embryo: Having the radicle directed towards the hilum: = homotropous.
1830Lindley Nat. Syst. Bot. 236 The embryo is certainly orthotropous in Streptocarpus Rexii. 1880Gray Struct. Bot. vi. §8. 278 Orthotropous, or straight ovule, is the simplest but least common species, being that in which the chalaza is at the evident base, and the orifice at the opposite extremity, the whole ovule straight and..symmetrical. Atropous..is a later and etymologically much better name. |