Page:An introduction to physiological and systematical botany (1st edition).djvu/499

 be admitted into it. Xylopia goes with the greatest propriety to its natural allies in Polyandria Polygynia, Annona, &c., its short stamens being inserted into the receptacle below the germen. Grewia, as well as Schreber's Microcos if a good genus, belong to Polyandria Monogynia, the organs of impregnation being merely elevated on a common stalk, like those of Passiflora and Ayenia. Ambrosinia, Arum, and Calla, are all justly removed by Schreber to Monoecia, though I think, for reasons hereafter given, they are more commodiously and naturally placed in the Order Polyandria of that Class, than in the Order Monandria. Dracontium and Pothos, of the same natural family, having perfect or united flowers, the former with 7 stamens to each, the latter with 4, are undoubtedly to be referred to their corresponding Classes, Heptandria and Tetrandria. Zostera, the only remaining genus of Gynandria Polyandria in Linnæus, I have long ago ventured to remove to Monandria Monogynia; See ''Engl. Bot. t. 467.''