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CUPRESSACEAE. Cypress Famity. 
Monoecious; cone-scales woody. 
Leaves in whorls of 4; cones and scales oblong. 1. Heyderia. 
Leaves opposite; cones globose; scales peltate. 2. Cupressus. 
Dioecious; leaves opposite; cones berry-like, their scales becoming fleshy. 
3. Juniperus. 
1. HEYDERIA. INcENSE cEDaR. 
1. HEYDERIA DECURRENS (Torr.) K. Koch, Dendrol. 2: 177. 
1873. 
Libocedrus decurrens Torr. Pl. Frem. pl. 3. 1854. 
Type locality: “Upper waters of the Sacramento, particularly 
from lat. 38° 40’ to about 41° N. lat.” 
Distribution: The post or incense cedar extends from the 
Santiam River in the southern Cascade Mountains southward 
through the Sierran District, of which it is one of the most charac- 
teristic trees. ‘The southern limit, as that of so many of the trees 
peculiar to the Sierran District, is Mount San Pedro Martir, Lower 
California. Transition. 
Specimens examined: Rock Creek Canyon, San Gabriel Moun- 
tains, Abrams &9 McGregor 574; Huston’s Flat, San Bernardino 
Mountains, Shaw, Aug. 1900; Strawberry Valley, San Jacinto 
Mountains, Leiberg 3149; Cuiamaca Mountains, near Talley’s 
ranch, Palmer 3; Laguna, Mearns 3653. 
2. CUPRESSUS. - Cypress. 
I. CUPRESSUS GUADALUPENSIS S. Wats. Proc. Am. Acad. 14: 300. 
1879. 
Cupressus macrocarpa guadalupensis Masters, Journ. Linn. Soc. 
31: 343. 1896. 
Type locality: “On Guadalupe Island, off the coast of Lower 
California.” 
Distribution: A small grove of cypress near the Jamul Valley, 
San Diego County, seems to belong to this insular species. 
Specimens examined: Cypress canyon, between Oneonta and 
Dulgura, Forbes, Dec. 3, 1907. 
