orthotropous

American  

[awr-tho-truh-puhs] / ɔrˈθɒ trə pəs /

adjective

1. Botany. (of an ovule) straight and symmetrical, with the chalaza at the evident base and the micropyle at the opposite extremity.

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orthotropous British  

/ ɔːˈθɒtrəpəs /

adjective

1. (of a plant ovule) growing straight during development so that the micropyle is at the apex Compare anatropous

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Etymology

Origin of orthotropous

From the New Latin word orthotropus, dating back to 1820–30. See ortho-, -tropous

Example Sentences

Nutlets coriaceous, small, tawny-hairy below, containing a single orthotropous pendulous seed.

From Project Gutenberg

Having the ovule inverted at an early period in its development, so that the chalaza is as the apparent apex; Ð opposed to orthotropous.

From Project Gutenberg

The female flower is enveloped in a closely fitting sac-like investment, which must be regarded as a perianth; within this is an orthotropous ovule surrounded by a single integument prolonged upwards as a beak-like micropyle.

From Project Gutenberg

Section of seed of Rock Rose, Helianthemum Canadense; orthotropous, with curved embryo in the albumen. 430a.

From Project Gutenberg

Ovary 1-celled, with 3 parietal placentæ, each bearing a few orthotropous ovules; the capillary style coherent with the tube of the perianth; stigmas 3, large, 2-lobed or notched, exserted.

From Project Gutenberg