Pachycladon elongata, Buch.

A small glabrous, open-branched, alpine plant. Root long, fusiform, elongate. Leaves few towards the bottom, ¾-inch long, with 5–7 deep serratures. Upper and largest portion of plant composed of flowering racemes, which are afterwards replaced by long slender siliqua or pods, 1 inch long.

It would appear that a gradation of form can be traced in the genus Pachycladon, from Hooker's Pachycladon novœ-zealandiœ, through P. glabra, Buch., to the present attenuate form, which may be named Pachycladon attenuata, Buch. The gradation of form in this case cannot be ascribed to climatic influence, as the three species were all collected at the same altitude and locality, Three Kings Mountain, 5,000 feet altitude.