conifers. SILVA OF NORTE AMERICA. 47 



PINUS CEMBROIDES. 

 Pinon. Nut Pine. 



Leaves in 2 or 3-leaved clusters, slender, from 1 to 2 inches in length. Cones from 

 1 to 2 inches broad. 



Pinus cembroides, Zuccarini, Abhand. Akad. Munch, i. Pinus Llaveana, Schlechtendal, Linncea, xii. 488 (1838).— 



392 (1832) ; Flora, 1832, ii. Beibl. 93. — Bentham, PI. Forbes, Pinetum Woburn. 49, t. 17. — Antoine, Conif. 



Hartweg. 58. — Link, Linncea, xv. 511. — Endlicher, 36, t. 16, f. 1. — Spach, Hist. Veg. xi. 401. — Lindley & 



Syn. Conif. 182. — Lawson & Son, List No. 10, Abieti- Gordon, Jour. Hort. Soc. Lond. v. 216. — Carriere, Traite 



nece,45. — Dietrich, Syn. v. 401. — Gordon, Jour. Hort. Soc. Conif. 405. — Gordon, Pinetum, 199. — Henkel & Hoch- 



ZkwcZ. i. 236, f . ; Fl. des Serres,iv. 324 b , f. 97. — Pinetum, stetter, Syn. Nadelh. 64 (excl. syn. Pinus edidis).— 



ed. 2, 265. — Lindley & Gordon, Jour. Hort. Soc. Lond. Hoopes, Evergreens, 143. 



v. 216. — Carriere, Traite Conif. 404. — Courtin, Fam. Pinus osteosperma, Engelmann, Wislizenus Memoir of a 



Conif. 92. — (Nelson) Senilis, Pinacece,107 . — Seneclauze, Tour to Northern Mexico (Senate Doc. 1848), Bot. Appx. 



Conif. 146. — Parlatore, De Candolle Prodr. xvi. pt. ii. 89. — Lindley & Gordon, Jour. Hort. Soc. Lond. v. 



397. — Watson, Proc. Am. Acad, xviii. 158. — Hemsley, 216. — Carriere, Fl. des Serres, ix. 201 ; Rev. Hort. 1854, 



Bot. Biol. Am. Cent. iii. 186. — Sargent, Forest Trees N. 227. — Mayr, Wold. Nordam. 241. — Beissner, Handb. 



Am. 10th Census U. S. ix. 190. — Masters, Jour. R. Hort. Nadelh. 253. — Hansen, Jour. R. Hort. Soc. xiv. 380 



Soc. xiv. 227. — Hansen, Jour. R. Hort. Soc. xiv. 356 (Pinetum Danicum). 

 (Pinetum Danicum). — Lemmon, West-American Cone- 

 Bearers, 28. 



A bushy tree, with a short stem rarely more than a foot in diameter and a broad round-topped 

 head, usually from fifteen to twenty feet high, but in sheltered canons on the mountains of Arizona * 

 and in Lower California occasionally fifty or sixty feet in height. The bark of the trunk, which is 

 about half an inch in thickness, is irregularly divided by remote shallow fissures and separates freely 

 on the surface into numerous large thin light red-brown scales. 2 The branch-buds are ovate, gradually 

 narrowed and acute at the apex, and about a quarter of an inch long, with bright chestnut-brown 

 lustrous scales thin and scarious on the margins and contracted into long tips ; these scales cover the 

 lengthening closely imbricated leaf-buds in May or June, when the flowers expand, making the young 

 branches at this time extremely conspicuous, and do not entirely disappear until the second or third 

 season. The branchlets are slender, dark orange-colored, and covered with matted pale deciduous hairs 

 when they first appear ; during their first winter they are dark brown or orange-colored, and then, 

 gradually growing darker, are at the end of five or six years sometimes nearly black and still much 

 roughened by the scars left by the fallen bud-scales. The leaves are borne in clusters of two or 

 of three, with thin close sheaths scarious on the margins, about a quarter of an inch long and mostly 

 persistent for one or for two years ; they are slender, usually much incurved, entire, acute with 

 elongated callous tips, dark green, and from one to two inches in length ; they are marked on each 

 ventral surface with from four to six rows of stomata, and contain two dorsal resin ducts surrounded 

 by strengthening cells, and a single fibro-vascular bundle ; 3 they fall irregularly during the third 

 and fourth year. The staminate flowers are produced in short compact clusters, and are oval, about 

 a quarter of an inch long, with yellow crested anthers, and are surrounded by an involucre of four 

 bracts. The pistillate flowers are lateral and erect on short stout peduncles covered by ovate acute 



1 Teste Dr. T. E. Wilcox, U. S. Army. is more or less deeply divided into connected ridges and separates 



2 The conspicuously scaly bark of Pinus cembroides readily distiu- slowly into small closely appressed scales, 

 guishes it from the other American Nut Pines, on which the bark 3 Coulter & Rose, Bot. Gazette, xi. 303. 



