586 DR. M. T. MASTERS: GENERAL VIEW 
tree as growing on the mountains of Nevada, by Sir Joseph 
Hooker in the ‘ Gardeners’ Chronicle,’ July 31, 1886. 
It has been considered by some that Pinus monophylla and 
P. edulis constitute one species, and that P. monophylla is a 
dwarf and depauperate form of P. edulis (see Meehan in ‘ Bulletin 
of the Torrey Botanical Club,’ August 1885, p. 81). But, for 
reasons given in Sargent’s ‘Silva,’ xi. (1897) p. 51, it seems better 
to keep the two distinct, as they grow for the most part in dif- 
ferent districts and no intermediate forms have been discovered. 
15. Pinus Parryana, Engelmann (1862), not of Gordon. 
This species is called by Sargent (Silva, xi. (1897) p. 43, 
tab. 549) P. quadrifolia, thus adopting the name applied by 
Sudworth in 1897. The three-sided leaves have marginal resin- 
canals, no dorsal stomata, a circular meristele surrounded by an 
endoderm-layer of 20 or more cells, and the fibro-vascular bundle 
is unbranched. The mesophyll-cells have plicate walls. The 
bracts of the male flower are only four in number, according 
to Sargent. 
It is remarkable for the abundance and long duration of the 
primordial leaves aud their beautiful bluish colour. (See fig. 1, 
p- 585.) 
The apophyses of the ripe cone are strongly revolute and the 
seeds wingless. Cotyledous 8. 
It is a native of the arid mountain districts of Southern Cali- 
fornia near the Mexican frontier. 
The P. Parryana of Gordon is a form of P. ponderosa. 
16. P. cemBrorpEs, Zuccarini (1832); Sargent, Silva, xi. 
(1897) p. 47, tab. 550. 
In this species the caulicle is very stout, about 75 mill. 
long, erect, greyish brown. The primary leaves are crowded, 
spreading, linear, 25-35 mill. long, mucronate, obscurely 
serrulate. The three-sided leaves have marginal resin-canals 
and no dorsal stomata. The endoderm consists of about 16-20 
cells surrounding a circular meristele with a single fibro-vascular 
bundle. The cells of the mesophyll have plicated walls. The 
shoots are glaucous and not fluted, clothed to the base with leaf- 
fascicles. The buds, which are ovoid-oblong, pointed, are late to 
expand in spring. The male flowers are in racemose clusters, 
each flower being surrounded by four bracts only, and the seeds 
devoid of wings. The apophyses are recurved, but not so much 
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