The Botanical Text-Book: for Colleges, Schools, And Private Students
The Botanical Text-Book: for Colleges, Schools, And Private Students
Asa Gray
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These two constituent portions of the style or stigma are usually combined ; but are not unfre- quently separate, either entirely or in part, as in Euphorbiaceous plants, in Grasses, and especially in Drosera, where there are consequently twice as many nearly distinct styles as there are parietal placentae in the compound ovary. If the two component parts of the style of each carpel were here united into one, in the usual manner, their number would equal the placentae, and their position would ...be alternate with the latter. But since, in parietal placentation, each half-placenta is confluent, not with its fellow of the same carpel, but with the contiguous half-placenta of the ad- jacent carpel (370) , it were surely no greater anomaly for the half -stigmas, as in Drosera, to follow the same course. This is precisely what takes place in Parnassia, and in other cases where the stigmas are opposite the parietal placentae; — cases which were thought to be very anomalous, merely on account of the adoption of a false principle (that of the necessary alternation of the stigmas and placentae), but which are really no more so than the parietal placentation itself.
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