Oxyria digyna (Linnaeus) Hill.
A small plant with reniform entire leaves, and flowers and fruit like those of the common docks. Not rare in rock crevices at 5,000 to 6,000 feet elevation.
Polygonum minimum Watson.
Common at 5,000 to 6,000 feet altitude.
Polygonum douglasii Greene.
On a gravelly slope near the foot of Cowlitz Glacier.
Polygonum newberryi Small.
Common in the pumice fields, where it is a characteristic plant.
Polygonum bistortoides Pursh.
Very plentiful on the grassy slopes, where it is conspicuous by its dense white-flowered spikes an inch long, borne singly on slender stems a foot or two high.
Eriogonum compositum Douglas.
A form of this variable species occurs on the talus at the foot of the cliffs on the north side of Cowlitz Glacier.
Eriogonum pyrolaefolium coryphaeum Torrey & Gray.
Plentiful in the pumice fields.
BETULACEAE. (Birch Family.)
Alnus sinuata (Regel) Rydberg.
Sitka alder. A small alder, seldom over ten or twelve feet high. Common along the streams at low altitude.