peduncular spined group

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CSSA Newsletters #14
... Euphorbias from Africa, the plants in the peduncular spined group (e.g.: E. polygona, E. horrida, E. mamillaris) are unisexual. Species from the stipular spined groups (e.g.: E. ingens, E. echinus, ... from the same original imported plant by vegetative propagation. The female plants from the peduncular spined group, which are always unisexual, are receptive to any stray grains of pollen that come ...
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