† orthospermousadj.
Botany. Obsolete.
Of certain plants of the family Apiaceae ( Umbelliferae): having carpels with the albumen flat on the inner face; (of a carpel) having the albumen distributed in this way. Cf. campylospermous adj., cœlospermous adj.
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the world > plants > part of plant > reproductive part(s) > seed > [adjective] > of specific shape
subround1779
orthospermous1836
1836 J. Lindley Nat. Syst. Bot. (ed. 2) 22 The classification of de Candolle [sc. of the Umbelliferae] has..been attacked by Tausch..who asserts that the albumen is a fallacious guide. He says that some species of Bupleurum are campylospermous, and others orthospermous... He adds, that in Hasselquistia the fruit of the ray is orthospermous, while that of the disk is cœlospermous.
1859 C. Darwin Origin of Species v. 146 In the Umbelliferæ..the seeds being..orthospermous in the exterior flowers and cœlospermous in the central flowers.
1866 J. Lindley & T. Moore Treasury Bot. II. 1140 Thaspium, a genus of North American orthospermous Umbelliferæ... Its popular American name is Meadow Parsnip.
This entry has been updated (OED Third Edition, September 2004; most recently modified version published online March 2022).
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adj.1836