THUJA PINAOE^ 785 



LIB0CBDKC8 



3 THUJA L. Sp. 1002 



Trees with thin fibrous bark, scattered branches and distichous 

 evergreen foliage. Leaves opposite, adnate and imbricated in 4 

 rows, oblong, with free acute tips somewhat dimorphous.. Flow- 

 ers monoecious. 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 grains simple. Fertile aments ter- 

 minating stouter branchlets, of 8-12 erect scales, with 2 or more 

 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. pllcata Don Hort. Cantab, ed. 6, 249. T. gigantea Nutt. A talf 

 graceful tree 100-250 feet high and 2-12 feet in diameter at base : foliage light 

 green and shining : leaves ovate, acuminate and subpupgent : cones 5-8 

 lines long, ovate, cinnamon-colored; somewhat clustered at the ends of 

 branchlets, the ovate scales with a thin acute usually appressed mucro, the 

 lowest arid uppermost pairs sterile, the others with 2-6 ovules : seeds a little 

 short'eV than the wings which are 3 lines long, distinct and slightly unequal. 

 Frequent in forests California to Alaska and Idaho. 



4 LIBOCEDEUS Endl. Syn. Conif. 42. (1847.) 

 Evergreen trees with smooth or fissured bark, scale-like leaves 

 and monoecious or dicECiojis 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- 

 cronate below the apex, erect, at length spreading. Seeds in pairs 

 or solitary. Cotyledons two. ^ 



L. decnrrens Torr. PI. 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 arid 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 si' Idngi^uijiial septum, the middle pair 

 convex, obtuse at the tip, all with a short acute somewhat incurved mucro : 

 seeds oblong-lanceolate, 3-6 lines long, the narrow outer ^ng scarcely 

 longer'; the inner one broad and nearly' equalling the' scale. On dry hill- 

 aides, Oregon' to California and: Nfevada;,' ^: 



Tribe S Taxodirieee. Leaves' alikr-naie: Scales of the fertile 

 aments more numerous and spirally arranged, in fruit becoming a 

 WQody cone. Ovules erect.-.in some generOrA^vevted. 

 . y,;, J 5 SiEQTJOIA Endl-vSyn. Conif. 198. 



Tail trees with- str&,ight eolu-SBnaF trunks, flhort spreading bran- 



