6 THE PINES OF MEXICO. 



PlNUS cembroides var. EDULI8 Voss, Mitt. Deutsch. Dendr. Gesell. xvi. 95 (1907). 



Pints edulis Engelmann, Wislizenus Tour Nor. Mex. 88 (Senate Doc. 1848J. Parlatore 

 DC. Prodr. xvi, pt. 2, 398 (1868). Hemsley, Bot. Biol. Cent. Am. Hi, 186 ( 1883). Sargent, 

 Silvi N. Am. xi, 55, t. 552(1897); Man. Trees N. Am. 11, fig. 11 (1905). Masters, 

 Jour. Linn. Soc xxxv, 587, fig. 2 ( 1904). Britton, N. Am. Trees, 17, fig. 1 1 ( 1908). 



Leaves stouter than those of the species, usually in fascicles of 2. 



Near the northern boundary, and common in south western United States. 



Goldman, 1246 (565151) San Pedro Martir Mts. California Baja. 



Pixus cembroides var. Parryana Voss, Mitt. Deutsch. Dendr. Gesell. xvi, 95 (1907). 



Pints Parryana Engelmann, Am. Jour. Sci. ser. 2, xxxiv, 332 (1862). Parlatore, DC. 

 Prolr. xvi. pt. 2, 402, (1868). Masters, Jour. Linn. Soc. xxxv, 586, fig. 1 ( 1904). 



Pinls quadrifolia Sudworth, Bull. No. 14, Div Forestry, U. S. Dept. Agric. 17 (1897); 

 For. Trees Picif. Slope, 33, fig. 8 (1908). Sargent, Silva N. Am. xi, 43, t. 549 (1897); 

 Man. Trees N. Am. 10, fig. 9 (1905). Britton, N. Am. Trees, 15, fig. 9 (1908). 



Leaves often in fascicles of 4, stout. 



Northern California Baja. and a few localities in California near the Mexican boundary. 



Goldman, 1132 (565042) Hanson Laguna, California Baja. 



The clearly defined characters of P. Pinceana and P. Nelsoni emphasize the close affinity and the uncertain 

 characters of the four Nut-Pines P. cembroides, P. edulis, P monophylla and P.Parryana and I find it impossible to 

 separate these specifically, their cones being identical and the number of their leaves inconstant. The reduction 

 of the four to one species by Voss seems therefore perfectly justified; it was first suggested by Engelmann in his 

 Revision of the Genus Pinus. 



According to Masters {Jour. Linn. Soc. xxxv, 586, 588) P. edulis may be distinguished from P. cembroides by 

 the absence of dorsal stomata in the leaves of the latter. This character however fails in Mexican specimens, 

 dorsal stomata being very common in the leaves of the typical P. cembroides. 



PLATE I. 



Fig. 1, 2, 3, 4. Cones. Fig. 9. Branch with leaves. 



" 5. Leaf-iection of typical form, magn. 30 diam. " 10. Cone-scale and seed. 



" 6. Leaf-section of var. monophylla, magn. 30 diam. " 11. Conelet magnified. 



" 7. Leaf-section of var. edulis, magn. 30 diam. " 12. Deciduous fascicle-sheath, magnified. 



*' 8. Leaf-section of var. Parryana, magn. 30 diam. " 13. Tree at Sandia, Durango. 



