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PEAT 4 
Gomey modified by a2 boss bearing a prickle in species. Seeds winged, 
shed at maturity of cone or in some species retained in the unopened 
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). Pinus (“ourn.)L. Fine. 
Grees de otiIe'ltrtes, vith whorled branches and two kinds of 
needles, the primary needles solitary, alternate, the secondary . 
porne in the axils of the primary leaves and forming. the ordinary 
foliage, in fascicles of 2-5, each fascicle surrounded at the- base 
by a series of scarious bracts which may or may not be deciduous at 
the end of the first season. Needles persistent for sever&l years. 
Staminate and ovulate cones usually borne on separate branches of the 
same tree, the former clustered at the base of the season's growth, 
more or less cylindrical, composed of a spiral series of 2-chambered 
stamens, subtended by an ir¥olucre of chaffy bracts, the latter 
usually lateral, solitary or several, composed of a spiral series of 
fertile sporophylls (scales), each bearing two ovules on-the upper 
surface, each subtended by an inconspicuous bract; fruit greatly en- 
larged, forming a woody cone, usually not maturing until the secom, 
sometines, the third season, #m@ persistent on the tree. for several 
years in some species; scales thickened mi rigid, the tip variously 
cone for several years. Cotyledons d-angled, several. 
O Needles in clusters of five; cone scales without a 
4 recurved or spreading prickle 
é} Needles less than 1 mm. in diameter, the cluster 
hardly 2 um. in diameter, the margins of the 
L needles smooth, the stomatal lices on the upper 
surface not conspicuous; cones ovate, not 
pendulous, 4-8 cm. lone ). Bs albicaulis 
a 
a Needles slishtly more than 1 um. in diameter, 
the cluster nearly 3 mm. in diameter, tne ; 
marzins of the needles minutely toothed under 
6 a lens, rou. to the touch, the ©-4 lines of 
stomata on the upper surface waite and-con- 
spicuous; cones cylindrical, pendulous, 
15-20 cme lons@© 2. P. monticola 
ONeedles in clusters of 2-4; cone scales armed with | 
4 a short prickle@ j 
2 Needles in clusters of 2, hemisyherical in cross- 
£, section; cones 4-5 cm. long@ 3 PB. contorta 
7 Needles in ciusters of 5 (sometives 4), 5-anglea; 
ones 7-12 cm. lone@ 4.2. ponderosa 
ee et Se | 
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