There's a simple explanation for why we see so little of selfing: we neatly pollinate away the evidence. A selfing-prone Lithops plant will nonetheless accept, or seem to accept, pollen from its fellows. Unlike most of us, it will only show its definitive propensities if unwooed. I'd bet my reddest L. localis that in any large collection of Lithopsthere are some selfers, most of which will never have a chance to reveal their secret talent -because most large collections of Lithops are regularly and thoroughly pollinated by their caretakers. Moreover, samples from a given population have a strong natural bias toward floral synchronicity, so laggards or jump-the-gunners are likely to be few. And most people, upon finding a plump fruit formed somehow on or by a lonely plant, are likely to assume that an insect got in, that a wild wind blew a smattering of pollen in exactly the wrong direction, or that their senses misled them, as senses are wont to do.
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