38 GENUS PINUS 



IV. GEMBROIDES 



Seeds wingless, the nut large, wholly or partly bare of membranous cover. Cones varying from 

 yellow-ochre to deep red-orange in color. 



These are the Nut Pines, growing on the arid slopes and table-lands above the great plateau of 

 northern Mexico and its extension into the southwestern United States. There are three distinct 

 species. 



Leaves entire, the sheath deciduous. 



Cones subglobose, subsessile 13. cembroides. 



Cones cylindrical, pedunculate 14. Pinceana. 



Leaves serrulate, the sheath persistent 15. Nelsonii. 



13. PINUS CEMBROIDES 



1832 P. CEMBROIDES Zuccarini in Abh. Akad. Mtinch. i. 392. 



1838 P. Llavbana Schiede in Linnaea, xii. 488. 



1845 P. MONOPHYLLA Torrcy in Fremont's Rep. 319, t. 4, 



1847 P. Fremontiana Endlicher, Syn. Conif. 183. 



1848 P. EDULis Engelmann in Wislizenus, Tour. Mex. 88. 



1848 P. OSTEOSPERMA Engelmann in Wislizenus, Tour. Mex. 89. 



1862 P. Parryana Engelmann in Am. Jour. Sci. ser. 2, xxxiv. 332 (not Gordon). 



1897 P. QUADRiFOLiA Sudworth, Bull. 14, U. S. Dep. Agric. 17. 



1903 Caryopitys edulis Small, Fl. Southeast. U. S. 29. 



Spring-shoots pruinose. Leaves from 2 to 6 cm. long, in fascicles of 1 to 5, the sheath-scales revo- 

 lute at the apex, then deciduous; stomata ventral, or ventral and dorsal; resin-ducts external. Scales 

 of the conelet armed with a minute prickle. Cones from 4 to 6 cm. long, subglobose, subsessile; 

 apophyses lustrous ochre-yellow, crowned with a quadrilateral umbo bearing the minute prickle of 

 the conelet; seed flaxen yellow when fresh, its testa bare, the spermoderm adnate to the cone-scale. 



A broad tree with a round head, similar in size and form, but not in ramification, to the cultivated 

 Apple-tree; growing on arid slopes and table-lands. Its eastern limit is in southwestern Wyoming, 

 central Colorado, Texas, western Tamaulipas and northwestern Vera Cruz. It ranges over Utah, 

 Nevada, Arizona and the northern states of Mexico to the southern Sierras of California and to the 

 northern and southern extremities of Lower California. It is recognized by its small cone, which 

 expands, when open, into an irregular flat aggregate of loosely attached scales. The leaves are 

 shorter than those of the other Pines of this group. 



The cone of this species always retains its peculiar character. The variations are mainly in the 

 number of leaves in the fascicle. On this character this Nut Pine is divided by many authors into 

 four species — cembroides, with three slender leaves — edulis, with two stout leaves — monophylla, 

 with one leaf and — Parryana, with four stout leaves. But there are intermediate forms that 

 may be either cembroides or edulis, edulis or monophylla etc., and Voss's reduction of the four to a 

 single species with three varieties seems to be justified (Mitt. Deutsch. Dendrol. Ges. xvi. 95). 



Plate XIII. 



Fig. 130, Cone, cone-scale and seed. Fig. 131, Open cone. Fig. 132, Branchlet with leaves 

 and magnified leaf-section. 



14. PINUS PINCEANA 



1846 P. cembroides Gordon in Jour. Hort. Soc. Lond. i. 236, f. (not Zuccarini). 



1858 P. Pinceana Gordon, Pinet. 204. 



1882 P. LATisQUAMA Engelmann in Gard. Chron. ser. 2, xviii. 712. f. 125 (as to cone only). 



Spring-shoots slender, pruinose. Leaves in fascicles of three, the sheath revolute at the base, then 

 deciduous; stomata ventral, or ventral and dorsal; resin-ducts external. Scales of the conelet mi- 

 nutely mucronate. Cones from 6 to 9 cm. long, cylindrical, pendent on long peduncles; apophyses 



