THE PINES OF MEXICO. 



2. PINUS PINCEANA GORI). 



Pixus Pinceana Gordon, Pinetum, 204 (1858); ed. 2, 280 (1875). Hemsley. Bot. Biol. 

 Cent. Am. iii, 189, (1883). Shaw, Gard. Chron. ser. 3, xxxviii, 122, fig. 42 (1905). 



Pinus cembroides Gordon, Jour. Hort. Soc. Lond. i, 236, fig. (not Zuccarini) (1846), 



Pinus latisquama Engelmann, Gard. Chron. ser. 2, xviii, 712, fig. 125 (1882). Watson, 

 Proc. Am. Acad, xviii, 158 (1883). 



Leaves with deciduous sheaths, in fascicles of 3, 12-16 cm. long, entire; stomata ventral and 

 dorsal; resin ducts external. Conelets subterminal, long-pedunculate, single or in pairs, ochre- 

 yellow, their scales tumid, transversely keeled, furnished with a minute dorsal prickle. Cones 

 6-9 cm. long exclusive of the long peduncle, pendent, symmetrical, cylindrical or long-ovate, 

 opening at maturity, early deciduous; apophyses convex, transversely and prominently keeled, 

 ochre-yellow or red-orange, their umbos central. Seeds wingless, their dorsal surface bearing 

 a persistent membrane much darker than the pale brownish-yellow ventral surface. Branch- 

 lets long, slender, pendent, ashen-gray, their bark persistently smooth for many years. Buds 

 pale brown, small, cylindrical, covered with gum. 



A low tree with a short trunk, long, slender, pendent or subpendent branchlets and gray- 

 green foliage. Along gulches on the slopes above the great table-land in northeastern Mexico 

 between the 19th and 25th degrees of north latitude, associated with P. cembroides. 



Nelson, 6140 (347366) General Cepeda, Coahuila Rose, Painter &> Rose, 9092 (452571-2) Sierra de la 

 Mesa, Hidalgo Pringle, 2293, Palmer 1299, Shaw, Carneros, Coahuila. 



Ghiesbreght's specimen, No. 34, in the Herbarium of the Musdum d'Histoire Naturelle in Paris, was from 

 Meztitlan, Hidalgo. Ehrenberg's specimen, from which Gordon described the species, is accredited to Cuernava- 

 ca and must have been taken from a cultivated tree as Cuernavaca lies in a subtropical plain where Nut Pines do 

 not grow spontaneously. The height of 60 ft. given in Gordon's description, is much greater than recent 

 collectors have reported. 



Gordon's P. cembroides has been considered by many authors identical with P. edulis Engelm. But the Volcano 

 Orizaba is far removed from the habitat of P. edulis and the cone is clearly that of P. Pinceana. The loss of its 

 peduncle, a common accident with specimens of P. Pinceana, led Gordon to believe the cone to be sessile. 

 Specimens of normal development are easily distinguished from P. cembroides by the greater length of their 

 leaves. 



Fig. 1 



" 2 



" 3 



" 4 



" 5 



Cone of Ghiesbreght 34. 

 Cone from Carneros. 

 Cone of Nelson 6140. 

 Open cone and conelet. 

 Conelet, magnified. 



PLATE II. 



Fig. 6. 

 " 7- 



Cone scale and seed. 

 Branchlets and leaves. 

 Leaf-section, magn. 30 diam. 

 Deciduous fascicle-sheath, magnified. 



