Additional sources: 
Published—Deaver and Haskell 1955 (Ariz.); Jack 1900 
(Colo.) ; Leiberg et al. 1904 (Ariz.); Merriam 1890 (Ariz.); 
Peterson 1962 (Wyo.); Plummer and Gowsell 1904 (N. Mex.); 
Sudworth 1900a (Colo.); Weber 1961 (Colo.); Wolf 1938 
(Calif.). 
Thesis—W. D. Stanton 1931. 
flora of the Henry Mountains of Utah. 
Young Univ., 63 pp., illus. 
Unpublished—W. P. Cottam 1964. 
A preliminary study of the 
M.A. thesis, Brigham 
Pinus quadrifolia Parl. MAP 16 
Parry pinyon 
Pinus quadrifolia Parl. ex Sudw., U. S. Dept. Agr. 
Div. Forestry Bul. 14: 17. 1897. 
Parry pinyon is confined to low elevations in the dry 
mountains of southern California and northern Baja Cali- 
fornia from the San Jacinto Mountains south to the Sierra 
San Pedro Martir. Its range overlaps that of Pinus mono- 
phylla, but no intermediates have been reported. All of the 
sources listed below pertain to Baja California. 
Additional sources: 
Published—Goldman 1916; Wiggins 1944. 
Unpublished—Reid Moran 1963, 1964; J. Olmsted 1962. 
Pinus monophylla Torr. & Frém. MAPS 16 AND 17 
singleleaf pinyon 
Pinus monophylla Torr, & Frém. in Frém., Rpt. 
Explor. Exped. Rocky Mts. 319, t. 4. 1845: 
: ‘monophyllus. 2 
Singleleaf pinyon is widespread and common at low ele- 
vations in the isolated mountain ranges of the Great Basin, 
ranging from southern Idaho, western Utah, and northwest- 
ern Arizona through most of Nevada and eastern and central 
California to northern Baja California. It overlaps Pinus 
edulis in southwestern Utah, northwestern Arizona, and the 
New York Mountains of southern California, and intermedi- 
ate forms are known. This species was once thought to 
extend into central Arizona (Munns 1938), but the single- 
leaved pinyon of that region is now considered a variation of 
P. edulis (Little 1950, p. 12). The range of P. monophylla 
has recently been extended more than 100 miles south, in Baja 
California (Anonymous 1963; Reid Moran 10319) . 
Additional sources: 
Published—Anonymous 1963; Bailey and Bailey 1941; 
Goldman 1916 (Baja Calif.) ; Merriam 1893; Wiggins 1940 
(Baja Calif.). 
Thesis—C. McMillan 1948. A taxonomic and ecological 
study of the flora of the Deep Creek Mountains of central 
western Utah. M.S. thesis, Univ. Utah, 99 pp., illus. 
Unpublished—W. C. Bullard 1963 (Calif.); W. P. Cot- 
tam 1964 (Utah); G. K. Griffith 1963 iNew): L. W. Hoskins 
1963 (Nev.); M. Humphreys 1963 (Nev.); F. D. Johnson 1964 
(Idaho); M. A. McColm 1963 (Nev.); if H. Thomas 1964 
(Baja Calif.); W. W. Wagener 1963 (Calif.) . 
Pinus culminicola Andresen & Beaman MAP 18 
Potosi pinyon 
Pinus culminicola Andresen & Beaman, Arnold 
Arboretum Jour. 42: 438, fig. 2-4, 1961. 
This recently named species is the only high-elevation 
pinyon. It has been found only on Cerro Potosi, possibly 
the highest mountain in Nuevo Leén, where it grows as a 
timberline shrub (Andresen and Beaman 1961) and in the 
forest understory. It had previously been identified as Pinus 
flexilis (Muller 1939). 
Pinus maximartinezii Rzedowski MAP 15 
Martinez pinyon 
Pinus maximartinezii Rzedowski, Ciencia 23: 17, 
fig. 1-3, t. 2. 1964 
This remarkable new pinyon is known only from its 
type locality, the Cerro de Pifiones in the southern part of 
Zacatecas, Mexico, near the town of Juchipila. Discovered 
only in 1963, it is notable among the pinyons for its very 
large cones (Rzedowski 1964) . 
Pinus pinceana Gord. MAP 18 
Pince pinyon 
Pinus pinceana Gord., Pinet. 204. 1858. 
This pinyon is restricted to a few areas in northeastern 
and eastern Mexico from central Coahuila to central Hidalgo, 
and is nowhere common. It is often associated with Pinus 
cembroides, the common pinyon of Mexico. 
Additional sources: 
Published—Johnston 1943 (Coah., Zac. 
(S.L.P.); McVaugh 1952 (Qro.). 
); Diaz Luna 1962 
Pinus nelsonii Shaw MAP 18 
Nelson pinyon 
Pinus nelsonii Shaw, Gard. Chron. Ser. 3, 
36: 122, fig. 49. 1904; “nelsoni” 
This pinyon is confined to a few scattered localities in 
northwestern Mexico, from southern Coahuila, southern 
Nuevo Leon, and western Tamaulipas to San Luis Potosi. 
One of the rarest of the Mexican pines, it is associated with 
the common Mexican pinyon, Pinus cembroides. 
Additional sources: 
Published—Crespo 1963 (Tamps.) ; Miroy 1961 (Tamps.). 
SUBSECT. GERARDIANAE Loud. 
Pinus gerardiana Wall. MAP 19a 
chilgoza pine 
Pinus gerardiana Wall. ex D. Don in Lamb., Desc. 
Genus Pinus. Ed. 3 (8°), v. 2, unnumbered page 
between p. 144 and p. 145, t. 79. 1832. 
This species, noted chiefly for its large edible seeds, is 
confined to the mountains of eastern Afghanistan, parts of 
Pakistan, and scattered localities in the dry inner valleys ol 
the northern Himalayas. It may be more widely distributed 
than the map shows in Wazciristan, along the Afghanistan- 
Pakistan border. It is separated from Pinus bungeana, ms 
only close relative, by the 1,300-mile-long Tibetan highland 
Sources: 
Published—Aitchison 1879, 1881-1882 \fehanistan 
Burkill 1909 (Baluchistan); Clarke 1957 \fghanistan); 
Duthie 1898 (Pakistan); Linchevsky and Prozorovsky 1949 
(Afghanistan); Schweinfurth 1957; Stebbing 1906 (Baluchis 
tan). 
Unpublished—E. Nasir 1963 (Pakistan R. J. Rodin 
1963 (Pakistan); G. L. Webster 1963 (Kashmn 
9 
