Class 4. Tetrandria. Stamens 4.—Orders 3.
1. Monogynia. A very numerous and various Order, of which the Proteaceæ make a conspicuous part, consisting of Protea, Banksia, Lambertia, Embothrium, &c. See Botany of New Holland, t. 7—10. Scabiosa, Engl. Bot. t. 659; Plantago, t. 1558, 1559, remarkable for its capsula circumscissa, a membranous capsule, separating by a complete circular fissure into two parts, as in the next genus, Centunculus, t. 531; Rubia, t. 851, and others of its natural order, of whose stipulation we have spoken p. 219, are found here, and the curious Epimedium, t. 438.
2. Digynia. Buffonia, t. 1313.
Cuscuta, placed here by Linnæus, is best removed to the next class.
3. Tetragynia. Ilex, t. 496, a genus sometimes furnished with a few barren flowers, and therefore removed by Hudson to the 23d class, of which it only serves to show the disadvantage; Potamogeton, t. 168, 376, and Ruppia, t. 136, are ex-
