I2 
13. 
18. 
10. 
22. 
23. 
to 
SI 
TREES, 
Leaves sessile, 4-ranked: fruit a cone. Sequoia. 
Leaves elongated, short-stalked: fruit, fleshy. Torreya. 
. Leaf-scars not at all raised: buds resinous. Abies. 
Leaf-scars slightly raised: buds not resinous. Pseudotsuga. 
. Stipule-scars encircling the twig. Magnolia. 
Stipule-scars not encircling the twig. 16. 
. Leaves glaucous beneath. Persea. 
Leaves not glaucous. 17. 
. Leaves with nectar-glands beneath. Prunus. 
Leaves without nectar-glands, usually pungent. Mex... 
Leaves opposite. 
Leaves spreading (juvenile forms). 1Io.- 
Leaves closely appressed. 20. 
Leaves very stiff: fruit a cone. Sequoia. 
Leaves stiff: fruit berry-like. Juniperus. 
Leaves flexible. Chamaecyparis or Thuja (““Retinispora”). 
. Internodes not flattened: leaves alike. 21, 
Internodes flattened: leaves on the side flat, those 
on the edges deeply V-grooved. 23. 
. Foliage-sprays not fan-like: fruit fleshy. Juniperus. 
Foliage-sprays fan-like: fruit a cone. 22. 
Seeds 2-3 under each cone-scale. Chamaecyparis. 
Seeds numerous under each scale. Cupressus. 
Internodes distinctly longer than broad. Libocedrus. 
Internodes about as long as broad. 24, 
. Foliage-sprays slightly fan-shaped: internodes 
narrow (I-1.5 mm.). - Chamaecyparis. 
Foliage-sprays distinctly fan-like. 25. 
. Internodes moderate (2-4 mm.) : seeds 2. Thuja. 
Internodes broad (4-8 mm.): seeds numerous. Thujopsis. 
. Armed with at least some spines or prickles. 27. 
Unarmed. 3090. 
Deciduous Trees—Armed., 
. Leaves alternate, never 4-ranked. 28. 
Leaves opposite. 38. 
