and Old World Birches. 187 
This dwarf shrub of Newfoundland and Labrador is with-. 
out question Betula Michauxii, Spach,* based upon the B. 
nana of Michaux, not L., and made by Spach the type of his 
section Apterocaryon. Subsequently the plant was raised to 
generic rank by Opiz,+ and called Apterocaryon Michauxii ; 
while, on the other hand, Regel in his first Monograph treatedt 
the plant as a variety of B. nana, though he later recognized§ 
it as distinct. Habitally the plant is quite inseparable from 
the European B. nana; and since sheet No. 334,540 of the 
United States National Herbarium, from Nugsuak Peninsula 
in Greenland, shows strobiles with simple and variously divided 
scales, it seems that Regel’s earlier treatment of the plant was 
wiser and that the Newfoundland and Labrador representative _ 
of Betula nana is var. Michauexii (Spach) Regel. 
BeruLa PUMILA. 
|. Germ. xii, fig. 1280) and referred by Guerke to B. 
alpestris, and the plate of B. alpestris in Flora Danica (Suppl. 
t. 37). The name B. pumila, however, long antedates B. 
alpestris, Fries, and it should now be applied to the shrub of 
northern Europe as well as America. The true Betula pumila 
occurs In swamps from Lasrapor and NrwrounDLAND west- 
* Ann. Sc, Nat., ser. 2, xv, 195. + Lotos, v (1855), 258. 
§ Revel, Mon, Bet. (1861) 45. : 
Regel in DC. Prodr. xvi, part 2 (1864), 171. | Mant. 124 (1767). 
| HE Rege 
Summ. Veg. Scand. i, 312 (1846). lin DC., 1. ¢. 178. 
