花旗松

Pseudotsuga menziesii (Mirbel) Franco in Bol. soc. Broteriana 24: 74. 1950; Moore in Beileya 14: 10. 1966; Dallimore and Jackson, rev. Harrison, Handb. Conif. and Ginkgo. ed. 4. 562. f. 111 a-g. 1966. ——Abies taxifolia Poiret, Encycl. Meth. Bot. 6: 523. 1804, non Desfontaines 1804. ——Abies menziesii Mirbel in Mem. Mus. Hist. Nat. Paris 13: 60. 1825. ——Abies douglasii Lindl. Penny Cycl. 1: 32. 1833 ——Pseudotsuga douglasii (Lindl.) Carr. Traite Conif. ed. 2. 256. 1867; Clinton-Baker, Illustr. Conif. 1: 58. cum tab. 1909; Beissn. Handb. Nadelh. ed. 2. 99. f. 20. 1909; Flous in Trav. Lab. Forest. Toulouse Ⅱ, 4(2): 51. f. 1-13. 1936, et in Bull. Soc. Hist. Nat. Toulouse 71: 83. f. 1-13. 1937. ——Pseudotsuga taxifolia (Poiret) Britton ex Sudworth in U. S. Dept. Agr. Farm. Bull. 14: 46. 1897; Rehd. Man. Cult. Trees and Shrubs 37. 1927, ed. 2. 18. 1940, et Bibliobr. 1949; Dallimore and Jackson, Handb. Conif. ed. 3. 586. f. 106 a-g. 1948. ——Abietia douglasii (Lindl.) Kent, Veitch's Man. Conif. ed. 2. 476. f. 121-122. 1900.

乔木，原产地高达100米，胸径达12米；幼树树皮平滑，老树树皮厚，深裂成鳞状；一年生枝淡黄色（干时红褐色），微被毛。叶条形，长1.5-3厘米，宽1-2毫米，先端钝或微尖，无凹缺，上面深绿色，下面色较浅，有2条灰绿色气孔带。球果椭圆状卵圆形，长约8厘米，径3.5-4厘米，褐色，有光泽；种鳞斜方形或近菱形，长宽相等或长大于宽；苞鳞直伸，长于种鳞，显著露出，中裂窄长渐尖，长6-10毫米，两侧裂片较宽而短，边缘有锯齿。

原产美国太平洋沿岸。我国江西庐山引种栽培，生长不旺盛。