TSUGA PINAOEjE 789 



PICBA 



the axis. Seeds with resin-vesicles on the surface, winged. 



T. beterophylla Sargent. Abies heterophylla Raf. Tsuga Mertensiana 

 of authors not of Carr. A very large tree 100-200 feet high and 2-6 feet 

 in diameter, with rough rather thick barli: ultimate branchlets veiy slender, 

 roughish and when young long-hauy: leaves linear, 4-9 lines long, abniptly 

 pftioled, eatire or usually spinulose-sen-ate toward the rounded apex, shining 

 above, when younu; with 2 white stripes beneath: stammate flowers 2-3 Imes m 

 diameter, shorter than the stipe: cones oblong-cylindrical, acute, 4-9 lines long, 

 slightly pubescent: scales longer than wide: bracts truncate: seeds about 1 line, 

 long, the -wing twice as long: cotyledons 2 or 4. In moist places ui forestss 

 California to Alaska. 



T. Mertensiana Carr. Conif. ed. 2, 250. T. Pattoniana Engelm. A 

 large tree 100-200 feet high and 1-4 feet in diameter, with rough dai-k brown 

 bai-k, slender pubescent branchlets and and dark gi'een foliage: leaves 6-12 line, 

 long, angular, acutish, attenuate at the base, often curved, stomatose and keeled 

 both sides, unequal and appearing as if in fascicles: staminate flowers about 3 

 lines thick, on a very slender stipe: cones cylindrical-oblong, 2-3 inches long, 

 6-8 Unes in diameter: seeds 2}4 lines Idng, with an obliquely obovate wing 

 about 4 lines long. On the high mountains (Jalifomia to Alaska. 



10 PICEA Link Abh. Akad. Wias. Berlin 1727, 179. 



Large evergreen trees with reddish flaky bark and spreading 

 branches. Leaves keeled above and beneath, more or less quad- 

 rangular, articulated on a prominent, at last ligneous, persistent 

 rhombic ba^e, spirally arranged all around the branchlets, some- 

 times by a twist of the base somewhat 2-ranked: resin-ducts 

 irregular. Staminate flowers axillary and terminal on the previ- 

 ous year's! branchlets, with an oblong or cylindrical staminal 

 column, its short stipe surrounded by numerous bud-scales: the 

 commissure of the anthers expanding into a broad nearly circular 

 erect crest : anther-cells opening longitudinally. Pollen-grains 

 large, with 2 air-sacs. Pistillate amenta borne at the ends of 

 short or longer branchlets, the scales much longer than the bracts. 

 Cones maturing the first year, pendulous : scales and enclosed 

 bracts persistent upon tlie axis. Seeds without resin-vesicles, 

 imbedded in the membrjlnous base of the wing which leavs its 

 under side nearly free and permits it to fall out. Cotyledons 4-8. 



P. Breweriana Watson Proc. Am. Acad, xx, 378, A slender tree 

 100-150 feet high and 3-4 feet m diameter, with spreading or ascending bran- 

 ches and puberulent pendent branchlets, these sometimes 6-8 feet long and not 

 more than 4 lines in diameter: leaves 5-12 lines long,, strictly sessile upon the 

 slender base, obtuse, smooth and rounded or slightly carinate above, stomatose 

 beneath on each side of the slightly prominent midnerve: cones 2-4 inches 

 long. 8-10|| lines in diameter, norrowly cylindrical, attenuate at base: bracts 

 lineaivoblong, 2 Imes long: scales thick, puberulent,- obovate, with slightly 

 thickened rounded summit, entire, 6-8 lines long: seeds 1>^ lines long, the 

 wing 4, lines long, 2)^ lines wide. On dry rocky ridges in the Siskiyou and 

 Coast Mountains of southern [^Oregon and ^adjacent Calif oraia, 



P. Engelmanni Engelm. Trans. St. Louis Acad, ii, 212. A tree 100- 

 150 feet high and 2-5 feet in diameter with cinnamon coloredjbark and spread- 

 ing branches with pubescentjbranchlets: leaves^soft^and flexible, standing out 

 in all directions fi-om all sides of the branchlets, tetragonal, acute, with callus 



