junirerus PINACE^ 783 



* Leaves not in sheaths, mostly entire: flowers on last years bran- 

 chlets: cones maturing the first year. 



*■ Branchlets smooth, the leaf-scars not raised. 

 ** Leaves in fascicles at the ends of small branchlets, deciduous. 



6 Larix Cones pendant at the ends of short branchlets, with thin persis- 

 tent scale: seeds without resin vesicles. 



** ++ Leaves solitary and scattered along the branchlets, persistent. 



7 Abies Leaves sessile, leaving circular scars : cones erect, their scales 



and bracts deciduous from the central axis : seeds with resin vesicles. 



8 Psendotsnga Leaves petioled, the scars transversely oval : cones pen- 



dulous, their scales and bracts persistent on the central axis : seeds 

 without resin vesicles. 



*■ *- Branchlets rough from the prominent persistent leaf-bases: 

 cones pendulous, their scales and bracts persistent on the central axis. 



9 Tsuga Leaves petioled, with a single dorsal duct: seeds with resin 



vesicles. 



10 Picea Leaves sessile, keeled on both sides, with 2 lateral complete or 

 incomplete ducts : seeds without resin vesicles. 



* * Cones maturing in the second year their bracts becoming 

 corky and thickened: leaves of the perfect plant in bundles of 1-5, 

 from the axil of scarious bracts, their bases surrounded by a sheath of 

 scabrous bud-scales, usually serrulate. 



11 Pinus Leaves needle-shape, the resin-ducts inconstant in number 

 and variously placed. 



Tribe 1 % Cupressinex. Cupressinese and Juniperex Endl. Syn. 

 Conif. 6. Leaves decussately opposite or ternate, often dimorphous, 

 usually scale-like and mostly adnate, the earlier ones free and subu- 

 late: leaf -buds not scaly. Anther-cells 2-8, introrse on the lower 

 part of the face of the peltate connective-scale. Pollen-grains sim- 

 ple. Scales of the fertile amentsfew, decussately opposite, apparently 

 single, becoming a small cone or connate into a drupe-like fruit. 

 Ovules erect, solitary or rarely 2 to each scale. Cotyledons usually 2. 



1 JUNIPERUS L. Sp. 1038. 



Shrubs or trees with opposite or verticillate subulate or scale- 

 like sessile evergreen leaves, usually of 2 kinds, and dioecious 

 or sometimes monoecious small globose axillary or terminal 

 aments. Staminate aments oblong or ovoid. Anther-cells 4-8 

 under each shield-shaped scale. Fertile aments of 2 or 3 series of 

 fleshy scales, with 2 erect ovules to each scale, in fruit becoming 

 united into a blue-black or reddish drupe, ripening the second 

 season. Seeds 1-12, ovate, bony. 



§ 1 Oxycedrus Spach Ann. Sc. Nat. 2nd. Ser. xvi, 289. 

 Leaves ternate, free and jointed at the base, linear-subulate, 

 pungent, channelled and white-glaucous above, not glandular- 

 pitted. 



J. communis L. Sp. 1040. A low tree or erect shrub 1-25 feet high : 

 with shreddy bark, the branches spreading or drooping : leaves all subulate, 

 rigid, spreading or some of the lower reflexed, mostly straight, verticillate 



