1916] FORSAITH—ON AGRACEAE 477 
spores, ranging from 10 to nearly 100 per cent in some cases. It is 
not surprising that this species should show a larger degree of 
abortion than the allied member of the subgenus Chamaenerion, 
since its entire range coincides with that of E. angustifolium as 
represented by the solid black portion of text fig. 1. List II shows 
the relative amount of sterile and perfect specimens of pollen. 
Fig. 9 illustrates pollen conditions in E. latifolium L. collected in 
Newfoundland. Reference to this figure will show that nearly all 
of the grains (those which are small, empty, and shriveled) are 
degenerate. Fig. 10 pictures the microspore formation in a plant 
from La Plata Canyon in Colorado. It will be observed that all 
the grains, with a single exception, are shrunken, and the fully 
formed one is abnormal in having more than the usual number of 
germination pores. Evidences of hybridism in an Alaskan E£. 
latifolium are indicated in fig. 11. In this illustration the infertile 
grains appear as shrunken cells which are destitute of protoplasm. 
It is of importance to note in this connection that there is a general 
tendency in E. latifolium to abortion, and this condition is still 
more suggestive when it is observed that this plant, throughout 
its entire range, is coexistent with E. angustifolium. 
LIST Il 
Stations or Epilobium latifolium, SHOWING RELATION OF PERFECT AND 
DEFECTIVE POLLEN TO LOCALITIES; DEFECTIVE POLLEN INDICATED 
BY AN ASTERISK 
*Disko, Greenland; *Godthaab, Greenland; *Tessiastuk, Greenland; 
*Hamilton Inlet, Indian Harbor, Greenland; *Roma, Labrador coast; *Valley 
of Exploits River, Newfoundland; Bay of Islands, Newfoundland; *Rope 
Cove, Newfoundland (fig. 9); *Grand Cascapedia River, Quebec; *St. John 
River, Gaspé County, Quebec; *Dartmouth River, Gaspé County, Quebec; 
*La Plata Canyon, Colo. (fig. 10); *Gunnerson Watershed, W. Cent. Colo.; 
*Graymount, Colo.; *Clear Creek, Colo.; *Buffalo River, Wyo.; *Mary 
Baker Lake, Mont.; *Fort St. Michael, Alaska; *Mt. Rainier, Wash.; *Seattle 
Wash.; *Shunagan Feld, Alaska; Lake Indian, Upper Yukon; *Chugackik 
Bay, Alaska; *Yakutat Bay, Alaska (fig. 11); *Selkirk, 118° 20’ n. long. 
and 51° 45’ n. lat.; *Juneau, Alaska; *Cold Foot, Yukon River, Alaska; 
*Cape Nome, Alaska; *Nazan Bay, Atka, Aleutian Islands; Akutan, 
Aleutian Islands; Glacier River, Unalaska, Aleutian Islands; *Mountains 
of Colorado. 
