Page:An introduction to physiological and systematical botany (1st edition).djvu/201

 acinaciforme above-mentioned.

Dolabriforme, hatchet-shaped, compressed, with a very prominent dilated keel, and a cylindrical base, as M. dolabriforme, ''Dill. Elth. t. 191, Curt. Mag. t.'' 32.

These two last terms might well be spared, as they seem contrived only for the plants in question, and indeed are not essentially distinct from each other.

Trigonum, three-edged, having three longitudinal sides and as many angles, like ''M. deltoides, Dill. Elth. t. 195, Linn. Phil. Bot. t.'' 1. f. 58. Linnæus has erroneously referred to this figure to illustrate his term deltoides; misled, as it should seem, by the name of the plant to which it belongs; but his definition is foreign to the purpose, see p. 155, and alludes to the outline of a flat leaf.

Triquetrum differs from trigonum only in being used by Linnæus for a three-sided awl-shaped leaf, as ''M. emarginatum, Dill. Elth. t. 197, f. 250, and bicolorum, t. 202, also Saxifraga burseriana.''

Tetragonum, four-edged, having four