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orthotropous adj.【植物;植物學】直生的〔指胚珠及其種臍、珠孔在一...

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When ovule orientation is orthotropous the chalaza corresponds to the point where the funicle is attached but in anatropous and campylotropous ovules the chalaza is some distance from the funicle 當胚珠的方向是直生胚珠時,合點和珠柄連成一條直線,當胚珠是倒生胚珠或彎生胚珠時,合點和珠柄之間有一定的距離。