KEY TO THE SPECIES OF CUPRESSUS AND 

 CHAMAECYPARIS 



Cone woody. 6-16-scaled, 3^-1 H inches diameter, ripening 2nd year, 

 with 6-20 seeds per scale; branchlets round or 4-angled; leaves 



fringed with narrow translucent border visible with lens 



CUPRESSUS. The CYPRESS. 



2. Leaves glaucous, pale blue to silvery gray-green; cone 6-8-scaled, 



M-1 M inches diameter. 



3. Leaves acute, glandular; twigs gray; Arizona to Texas and 

 Mexico. . Cupressus arizonica Greene. Arizona Cypress, p. 101. 



3. Leaves obtuse; twigs bright red; southern and lower California 



and Mexico 



Cupressus guadalupensis S. Wats., Tecate Cypress, 



2. Leaves dark or bright green. 



4. Leaves conspicuously glandular-pitted on back; cone 6-8-scaled, 

 H-1 inch diameter. 



5. Cones with prominent horn-like umbos; rare; Oregon and 

 California Cupressus macnabiana A. Murr.. McNab Cypress, 



5. Cones with short-conical umbos; southern Oregon and 

 northern California C. bakeri Jeps., Modoc Cypress 



4. Leaves without glands or obscurely glandular. 



6. Cones 6-8-scaled, M-M inch diameter; California (Men- 

 docino County) Cupressus goveniana Gord., Gowen Cypress, 



6. Cones 8-14-scaled, Vg-l Y^ inches diameter. 



7. Branchlets and boss of cone scales thick; California 



Cupressus macrocarpa Hartw., Monterey Cypress, 



7. Branchlets and boss of cone scales thin; planted orna- 

 mental Cupressus sempervirens L., Italian Cypress 



Cone leathery to semi-fleshy, 4-10-scaled, H-H inch diameter, ripen- 

 ing in 1 or 2 years, with 2 seeds (rarely 5) per scale; twigs somewhat 

 flattened; leaves entire CHAMAECYPARIS. The WHITE-CEDAR 

 8. Branchlets not arranged in conspicuous horizontal planes; leaves 

 green on both sides; bark on matxu-e trees thin; cones with 4-6 

 scales; lateral and facial leaves nearly equal in size. 

 9. Branchlets slender; leaves about A inch long, usually glandular; 

 cones }4 inch diameter, maturing in 1 year, 1-2 seeds per scale; 

 heartwood light-brown; Atlantic Coast from Maine to Missis- 

 sippi Chamaecyparis thyoides (L.) B.S.P., 



Atlantic White-cedar, p. 105. 



9. Branchlets stout; leaves about Vs inch long, often without 



glands; cones H-}4 inch diameter, maturing in 2 years, 2-4 



seeds per scale ; heartwood clear yellow ; Pacific Northwest .... 



Chamaecyparis nootkatensis (D. Don) Spach, Alaska-cedar, 



p. 105. 

 8, Branchlets arranged in conspicuous horizontal planes; cones with 

 10 scales; leaves with glaucous or whitish marks below; heartwood 

 light brown. 



10. Bark on mature trees thick and fvu-rowed; leaves conspicuously 

 glandular on the back and indistinctly marked with white 

 streaks below, lateral much larger than facial: Oregon and 



California, also widely planted Chamaecyparis lawsoniana 



(A. Murr.) Pari.. Port Orford-cedar, p. 103. 



10. Bark on mature trees thin; leaves without glands or glands 



indistinct, but with distinct white markings below; Japanese 



ornamentals widely planted in the United States. 



11. Leaves closely appressed, obtuse to acute, the lateral much 



larger than the facial, conspicuous Y-shaped white mark 



below; cone H-H inch diameter Chamaecyparis obtusa 



(S. & Z.) Endl., Hinoke White-cedar, p. 103. 



11. Leaves loosely appressed, acuminate, the lateral slightly 



larger than the facial, conspicuous white patches below; cone 



yi inch diameter . . . .Chamaecyparis pisifera (S. & Z.) Endl., 



Sawara White-cedar, p. 103. 



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