1918] Fernald,— Epilobium, Sect. Chamaenerion 7 
carelessness, may be somewhat pardoned; but the other facts which it 
seems necessary to emphasize are more fundamental in character. 
In the first place, E. angustifolium and E. latifolium are thoroughly 
distinct in their morphological characters (and by morphology is meant 
not merely what can be seen under a microscope) and in their habitats, 
and only at the southern or lower limits of the range of E. latifolium 
are they generally coexistent. 
Briefly the chief morphological differences between the species may 
be summarized as follows: 
E. angustifolium 
Stems solitary or few, erect. 
Leaves membranaceous, green 
above, reticulate-veiny beneath, 
linear- to oblong-lanceolate, and, ex- 
cept in the arctic-alpine var. inter- 
medium, 7-20 cm. long. 
-Style pilose at base, in maturity 
exceeding the stamens. 
Stigmas slender and 
becoming revolute. 
Seeds oblong, 1-1.3 mm. long. 
elongate, 
E. latifolium 
Stems numerous, depressed or 
arched-ascending. 
Leaves thick and fleshy, very 
glaucous on both surfaces, not veiny, 
elliptic-ovate to lanceolate, 2-8 em. 
long. 
Style glabrous, much shorter than 
the stamens. 
Stigmas short and thick, not be- 
coming revolute. 
Seeds fusiform, 2 mm. long. 
The habitats and ranges of the two species, as already indicated, 
are likewise very different. E. angustifoliwm-is widely dispersed over 
boreal and cool-temperate regions, extending south in eastern America 
to North Carolina and Kansas, and growing chiefly in humus or in 
recently burned areas of the less calcareous regions. LE. latifolium, 
ðn the other hand, is an arctic-alpine calciphile, extending in eastern 
America south to Newfoundland, Saguenay County and the Gaspé 
Peninsula, Quebec, and James Bay, the southern lobe of Hudson Bay. 
Throughout the southern part of its range the plant is local and appar- 
ently confined to calcareous or argillaceous river-gravels, its known 
stations between the Straits of Belle Isle and the Rocky Mountain 
region being as follows: Forteau, Labrador; 70-80 miles up the 
Natashquan River, Saguenay Co., Quebec; gravel bars of Mingan 
River, Saguenay Co., Quebec; gravel deposits of the rivers of Gaspé, 
Matane and Bonaventure Cos., Quebec, west to the Matane River 
(longitude 67° 40’ w.) and the Grand Cascapedia (longitude 66° w.); 
Fort George and vicinity, James Bay (longitude 79° w.); St. Mary’s 
River, Alberta (longitude 113° w.). In other words, there is abso- 
