Rhizomes and caudices

Left. Chamerion angustifolium (L.) Holub. Rhizome of a large and vigorous plant from Yukon, Ogilvie Mts., river flats along Dempster Rd. 30 July 1966. R.T. Porsild 371. Right. Potentilla vahliana Lehm. Small and compact plant with well developed, elongated, and branching underground caudex tightly covered with leaf bases, the marcescent remains of previous season's leaves, and a small compact tuft of current season's leaves. N.W.T. Victoria Island, Holman.