300 PINACEAE 



autumn; Is. spirally arranged on leading shoots. Male fls. in terminal drooping 

 panicles; female scattered near end of previous year's wood. Fruit a leathery 

 round or egg-shaped cone, i|, scales peltate. South United States. (Fig. 47 M.) 



* Tetraclinis articulata. Alcerce. 50. E. Like Cupressiis and Thuya, but 

 cones have only four scales. North Africa. (Fig. 47 N.) 



THUYA. Arbor-vitae. Foliage similar to Ciipressus (q.v.). Fruit a w^oody cone, 

 usually elongated, with six to ten pairs non-peltate scales. 



T. (Thuyopsis) dolabrata. 50. E. Branchlets in opposite rows in horizontal 

 plane. Ls. with brilliant and clearly defined white markings on back. 

 Cone f , egg-shaped, each scale 3-5-seeded. Japan. (Fig. 47 o.) 

 T. japonica [Thuyopsis Standishii). 2^. E. Bark twisted. Branchlet systems 

 in horizontal planes. Ls. with white markings on back, but no glands, 

 not aromatic; pairs on central axis not distant. Cone J, oblong. Japan. 

 (Fig. 47 p.) I 



T. occidentalis. 60. E. Branchlet systems dark green above, pale green below, 

 turning brown in winter, no white markings but glands prominent; 

 central axis flattened, with 1. -pairs close together. Cone \ to |. East 

 North America. (Fig. 47 r.) 1 



Variety aurea. Young shoots yellow. | 



Variety ericoides [Retinospora dubia). Ls. all juvenile; a dwarf shrub. 

 T. {Biota) orientalis. 40. E. Branchlet systems in vertical plane, same shade 

 of green on both sides. Ls. very small, small depressed glands on lower 

 surface, closely pressed to stem. Cone |, egg-shaped, scales hooked, 

 seeds wingless. China. (Fig. 47 Q.) 



Variety aurea. Branches tipped with yellow in summer. 



Variety ericoides (Retinospora ericoides). Ls. all juvenile, glaucous. 

 T. plicata (T. gigantea, T. Lobbii). 200. E. Branchlet systems in horizontal 

 plane. Ls. aromatic, with white markings and small glands on back; 

 central axis not flattened, 1. -pairs sharp-pointed and somewhat distant. 

 Cone ^. Alaska to North California. (Fig. 47 s.) 



Variety pyramidalis. Tall and narrow form. 



Varieties variegata and zebrina. Yellow interspersed with green. 



TSUGA. Hemlock Spruce. Branches alternate. Ls. alternate, linear, flat, 

 blunt, usually 2-ranked, with two white lines below. Male fls. solitary, round, in 

 1. -axils; female at end of lateral shoots. Fruit a small woody drooping cone. 



{a) Ls. minutely toothed 



T. Albertiana (T. Mertensiana, T. heterophylla). Western Hemlock. 200. 



E. Leading shoot and branches drooping. Ls. |, the white lines with 



diffuse edges. Cone i. West North America. (Fig. 47 h.) 

 T. Brunoniana. Himalayan Hemlock. 120. E. Ls. i, very white below, the 



lines with clearly defined edges. Cone i . East Himalaya. 

 T. canadensis. Eastern Hemlock. 100. E. Ls. h, white lines with clearly 



defined edges. Cone f . East North America. (Fig. 47 j.) 

 T. Pattoniana {Abies Williamsonii). Mountain Hemlock. 100. E. Ls. not 



2-ranked, i, grey or bluish green. Cone 3 X f . West North America. 



(Fig. 47 K.) 



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