THUyA | PINACE 785 
LIBOCEDRUS 
38 THUJA L. Sp. 1002 
Trees with thin fibrous bark, scattered hranchesand distichous 
evergreen foliage. Leaves opposite, adnate and imbricated in 4 
rows, oblong, with free acute tips somewhat dimorphous. Flow- 
ers moncecious. Aments terminal, of few scales decussately 
imbricated in pairs. Staminate flowers numerous, very small, 
with 3 or 4 anthers under each of the 4 or 6 subpeltate broadly 
ovate pointed scales. Pollen grainssimple. Fertile aments ter- 
minating stouter branchlets, of 8-12 erect scales, with 2 or mere 
erect ovules at the base of each. Cones soon strongly reflexed, 
maturing the first season, small, the thin-coriaceous scales ovate, 
the lowest and uppermost pairs sterile. Seeds lanceolate and 
‘somewhat compressed, nearly equally winged. 
T. plicata Don Hort. Cantab. ed. 6, 249. T. gigantea Nutt. A tall 
graceful tree 100-250 feet high and 2-12 feet in diameter at base: foliage light 
green and shining: leaves ovate, acuminate and subpungent: cones 5-8 
lines Jong, ovate, cinnamon-colored, somewhat clustered at the ends of 
branchlets, the ovate scales with a thin acute usually appressed mucro, the 
_ lowestand uppermost pairs sterile, the others with 2-6 ovules: seeds a little 
shorter than the wings which are 3 lines long, distinct and slightly unequal. 
Frequent in forests California to Alaska and Idaho. 
4 LIBOCEDRUS Endl. Syn. Conif. 42. (1847.) 
Dvergreen trees with smooth or fissured bark, scale-like leaves 
and moneecious or dicecious flowers. Leaves decussately opposite, 
imbricated by fours and dissimilar, the facial ones smaller, flat 
and appressed, the marginal ones bract-like and keeled. Aments 
solitary, terminal: the staminate ones with subpeltate scales, each 
with 3-4 longitudinally dehiscent anthers on the dorsal side. 
Fertile aments bracteate, with 4-6 decussately opposite erect 
scales, the lower pair usually sterile, the third when present con- 
nate into a longitudinal septum. Ovules 2 to each scale, flask- 
shaped, Cone ripening the first year, its scales subwoody, mu- 
-eronate below the apex, erect, at length spreading. Seeds in pairs 
or solitary. Cotyledons two. 
L. deeurrens Torr. Pl. Fremont 7, t 3. A_ tall tree 100-150 feet high 
by 3-7 feet in diameter, with lax scattered spreading branches: leaves 
bright green, in 2 decussate pairs at each joint, closely adnate except the 
short acute tip, the lateral without glands and nearly covering the flat- 
tened obscurely pitted inner ones: staminate flowers ovate, of 12-16 scales: 
cones 9-12 lines long, scaly-bracted at base, oblong, the lower scales very 
_ short, the upper connate into a longitudinal septum, the middie pair 
convex, obtuse at the tip, all with a short acute somewhat incurved mucro: 
seeds oblong-lanceolate, 3-6 lines long, the narrow outer wing scarcely 
longer; the inner one broad and nearly equalling the scale. On dry hill- 
sides, Oregon to California and Nevada. 
Tribe 2 Taxodinex. Leaves alternate. Scales of the fertile 
aments more numerous and spirally arranged, in fruit becoming a 
woody cone. Ovules erect: in some genera inverted. 
5 SEQUOIA Endl. Syn. Conif. 198. 
Tall trees with straight columnar trunks, short spreading bran- 
