io6o The Trees of Great Britain and Ireland 



PINUS PARRYANA 



Pinus Parryana, Engelmann, in Amer. Journ. Science, xxxiv. 332, note (1862) (not Gordon), and in 



Brewer and Watson, Bot. California, 124 (1880); Masters, m Journ. Linn. Soc. {Bot.) xxxv. 



586, fig. I (1904); Sargent, in Bot. Gaz. xliv. 227 (1907); Clinton-Baker, Illust. Conif. i. 39 



(1909). 

 Pinus quadrifolia. Parry, ex Parlatore in DC, Prod. xvi. 2, p. 402 (1868) ; Sudworth, U.S. 



Forestry Bull. No. 14, p. 17 (1897); Sargent, Silva N. Amer. xi. 43, t. 549 (1897), and Trees 



N. Amer. 10 (1905). 

 Pinus cembroides, Zuccarini, var. Parryana, Voss, in Deut. Gartenrat, Beilage 123 (1904); Shaw, 



IHnes of Mexico, 6 (1909). 



A tree, usually 20 to 30, occasionally 40 ft. in height, and rarely exceeding 

 5 ft. in girth. Bark, buds, and branchlets similar to P. monophylla. 



Leaves in fours, with occasional five -leaved clusters, remotely placed on the 

 branchlets, appressed together in the clusters, persistent three or four years, ij to 

 i^ in. long, incurved, rigid, sharp -pointed, entire in margin, with white stomatic 

 bands on the inner surfaces ; resin - canals marginal ; basal sheath as in P. 

 monophylla. 



Cones and seeds similar to those of P. monophylla. 



This species, which is scarcely distinguishable, except in the leaves, from P. 

 monophylla, is restricted in its distribution to the Santa Rosa^ and Toro mountains 

 in the San Jacinto range of southern California, and to Lower California, where it 

 grows as far south as the foothills of the San Pedro Martir mountain.^ It was 

 discovered in 1850 by Dr. Parry, 60 miles south-east of San Diego, California, at 

 2000 ft. altitude. 



The four-leaved piiion requires a moister climate ^ than P. monophylla, thriving 

 where the annual rainfall is 15 to 25 in. and growing at elevations between 2500 

 and 8000 ft. It usually occurs in open forests, mixed with other species, as 

 P. monophylla, oaks, and juniper. 



It appears to be exceedingly rare in cultivation, the only specimen which I have 

 seen being a small tree at Grignon in France. Dr. Masters appears to have seen 

 young plants, as he states that the species is remarkable for the abundance and long 

 duration of the primary needles, which are of a beautiful bluish colour. 



(A. H.) 



1 It was found, according to 8. B. Parish, in Erythea, vii. 89 (1899), by H. M. Hill on the desert slope of Santa Rosa 

 mountain, where it exists in considerable quantity at about 5000 ft. altitude. It does not exist on the San Jacinto peak. 

 H. M. Hill, in Univ. Calif. Publications, Bot. i. 20 (1902), reports it to be growing sparingly in the neighbourhood of Mount 

 Toro. 



2 Cf. Brandegee, in Zoe, iv. 210 {1893). 



3 Cf. Pinchot, U.S. Forest Service, Sylvical Leaflet 17 (1908). 



