Page:An introduction to physiological and systematical botany (1st edition).djvu/185

 the most part, a joint at its union with the branch.

Triangulare, triangular, having three prominent angles, without any reference to their measurement or direction, as in the genus Chenopodium, Cochlearia danica, t. 696, and some leaves of the Ivy.

Quadrangulare, with four angles, as the Tulip-tree, Liriodendrum tulipifera, Sm. Ins. of Georgia, t. 102. ''Curt. Mag. t.'' 275.

Quinquangulare, with five angles, as some Ivy leaves, &c.

Deltoides, trowel-shaped or deltoid, having three angles, of which the terminal one is much further from the base than the lateral ones, as ''Chenopodium Bonus-Henricus, Engl. Bot. t. 1033, and some leaves of Cochlearia danica''. A wrong figure is quoted for this in Philosophia Botanica, which has caused much confusion.

Rhombeum, rhomboid, or diamond-shaped, approaching to a square, as Chenopodium olidum, t. 1084, Trapa natans, Camer.