. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. Arctic Plants: Morphology and Synonymy 27 B merely reniform; on the other hand some very tall specimens collected near Peace river landing, Athabaska, by James M. Macoun, show the leaf-margin very finely crenulate and the outline roundish reniform with the sinus relatively narrow. With regard to the arctic plant, typical Caltha palustris occurs in Nova Zembla from where it is reported by Kjellman and Lundstrom ^ and where I found it myself;^ my specimens, however, are very small, measuring only from 5 to 7 cm. The form
. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. Arctic Plants: Morphology and Synonymy 27 B merely reniform; on the other hand some very tall specimens collected near Peace river landing, Athabaska, by James M. Macoun, show the leaf-margin very finely crenulate and the outline roundish reniform with the sinus relatively narrow. With regard to the arctic plant, typical Caltha palustris occurs in Nova Zembla from where it is reported by Kjellman and Lundstrom ^ and where I found it myself;^ my specimens, however, are very small, measuring only from 5 to 7 cm. The forma radicans, on the other hand, is known from arctic Scandin- avia, as stated above, and Kjellman found it also on the Asiatic coast of Bering strait, besides on St. Lawrence island. Furthermore, all the specimens collected on the Canadian arctic expedition represent this form (Fig. G: 1-2); and it is known also from the islands in Bering sea. The Siberian plant, on the other hand, represents mostly the variety sibirica Regel, with the forma radicans Kegel, characteristic of which is that the lobes of the leaf-blade form a very narrow sinus (Fig. 3).. FlGtTEE G. 1. Caltha Tpalustris L. forma radicans (Forst.) Hartm. A fruiting specimen from Hersohel island showiug three rooting shoots; two-thirds of the natural size. 2. A basal leaf of same form from the same locality ; two-thirds of the natural size. 3. A leaf of C. palustris L. var. sibirica Regel forma radicans CForst.) Reg. from Jakutsk, Siberia; two-thirds of the natural In comparing the leaf-outline of these various specimens we notice that the leaf of the typical plant in Europe is mostly reniform with the margin crenulate, but varying to almost roundish, suborbicular; on the American continent the typical plant has the leaf-blade more or less reniform but, as stated above, the orbicular outline does also occur; the margin varies from crenulate to entire; the latter form is evidently C. integerrima Pursh. In Siberia the l
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscienti, bookyear1919
