or·thot·ro·pous /ɔrˈθɑtrəpəs/
直生的
Or·thot·ro·pal Or·thot·ro·pous a. Bot. Having the axis of an ovule or seed straight from the hilum and chalaza to the orifice or the micropyle; atropous.
Note: ☞ This word has also been used (but improperly) to describe any embryo whose radicle points towards, or is next to, the hilum.
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orthotropous
adj : (of a plant ovule) completely straight with the micropyle at
the apex [ant: campylotropous]