heterostyly

(redirected from Pin and thrum)
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het·er·o·sty·lous

 (hĕt′ər-ə-stī′ləs)
adj.
Having flowers with styles of differing length, as the primrose.

het′er·o·styled′ adj.
het′er·o·sty′ly n.

heterostyly

(ˈhɛtərəˌstaɪlɪ)
n
(Botany) the condition in certain plants, such as primroses, of having styles of different lengths, each type of style in flowers on different plants, which promotes cross-pollination
[C20: from Greek, from heteros different + stylos pillar]
ˌheteroˈstylous adj
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References in periodicals archive ?
The predominant system in Fagopyrum, self-incompatibility, was first discovered by Darwin (1877) and belongs to the sporophytic system (Dahlgren, 1922) expressed in the pin and thrum flower type.
esculentum population is heterogeneous with a 1:1 ratio of pin and thrum plants, but there were no self-pollinated homostylic flowers found in the population.