ocr., 1899.] PLANTS. 141 
Sisyrinchium bellum Watson. Blue-eyed Grass. 
Fairly common in the Transition zone near Wagon Camp. 
Corallorhiza bigelovi Watson. 
Not uncommon in the woods near Wagon Camp. (Identified by Pro- 
fessor Greene.) 
Habenaria leucostachys (Lindl.) Watson. 
Common in the marsh at Wagon Camp. (Identiued by Professor 
Greene.) 
Habenaria unalaschensis Watson. 
.\ boreal species, fairly common in the marsh near Wagon Camp, 
growing with the last. (Identified by Professor Greene.) 
Populus trichocarpa T. & G. Western Balsam Poplar. 
Common in the upper Sacramento Canyon near Sisson, and less so 
along Shasta River at the south end of Shasta Valley. 
Salix lasiandra Bentham. Black Willow. 
Abundant in cool moist places about Sisson. (Identified by Miss 
Eastwood.) 
Salix nuttalli Sargent. Nuttall Willow. 
Common in moist places in canyons of the Canadian zone and near 
Wagon Camp. (Identified by F. V. Coville.) 
Salix sitchensis Sanson. Sitka Willow. 
Common in canyons in the Canadian zone. Found in Mud Creek 
Canyon near the mouth of Clear Creek. (Identified by F. V. Coville.) 
Alnus rhombifolia Nutt. White Tree Alder. 
Observed only on Shasta River in the southern part of Shasta 
Valley, where its zone position appears to be Upper Sonoran. Shasta 
Valley is one belt lower than the rest of the region about Shasta and 
contains a dilute tongue of Upper Sonoran species that come in from 
the north by way of Klamath River Valley. 
Alnus sinuata (Regel) Rydb. Alder. 
Common in moist places in the canyons of the Canadian zone. In 
Mud Creek Canyon noted as high as 6,700 feet. Found also near 
Wagon Camp. (Identified by F. V. Coville.) 
Alnus tenuifolia Nutt. Paperleaf Alder. 
f=. incana var. virescens Wats]. 
A Transition zone species common along streams in the neighbor- 
hood of Sisson Tavern and along the east base of Scott Mountains. 
(Identified by F. V. Coville.) 
Betula occidentalis Hooker. Birch. 
Fairly common along Shasta River at the south end of Shasta 
Valley. Not observed elsewhere. 
Corylus rostrata californica A. DC. 
Fairly common in the Transition zone in Squaw Creek Valley near 
McCloud: Mill, and probably elsewhere at the base of the mozntain. 
