PINACE^ 469 



than in its native habitat. Jepson records a plant which had been 

 moved three times, as being 30| ft. high at 17 years of age, its 

 annual growth in three successive years being 4 ft. 



Pinus tropicalis, Morclet. 



Pinus terthrocai'pii, Shaw. 



A tree 50-60 ft. high with a girth of 6 ft. Bark greyish, tinged 

 with red, irregularly broken into large, oblong plates. Branches 

 ascending and forming an open, rounded crown. Young shoots 

 stout and rough. Winter buds stout with reflexed scales. Leaves 

 in pairs or rarely in threes, very erect, rigid, 4-8 in. long, margins 

 minutely toothed, resin canals very large, touching both endoderm 

 and hypoderm and forming a septum. Cones erect or spreading, 

 ovate-conic, symmetrical ; scales orange-brown above, pyramidal, 

 transversely keeled. 



Closely allied to P. carihcea, but distinguished by its peculiar 

 leaf section. 



A tropical species growing at sea-level and confined to W. 

 Cuba, the Isle of Pines, and the mainland in Florida. Not in 

 cultivation in the British Isles. 



Shaw, Genus Pimis, 52 (1914). 



Pinus tuberculata, Gordon. 

 Knobcone Pine. 



Pinus attenuata, Lcmmon ; P. californica, Hartweg (not Loiseleur). 

 Narrow-cone Pine ; Prickly-cone Pine ; Sandy-slope Pine ; Snow-line 

 Pine ; Tuberculated-cone Pine. 



A small tree 20-50 ft. high, or occasionally taller, and 3-6 ft. 

 in girth, often developing more than one trunk and a heavily 

 branched head of dense foliage. Bark of old trees dark brown, 

 about I in. thick, scaly. Young shoots prominently ridged, light 

 brown, and free from down. Winter buds narrow, cylindrical, 

 pointed, |-1 in. long with closely pressed resinous scales. Leaves 

 in threes, lasting 3-4 years, grey-green, slender, 4-7 in. long, 

 margins with rudimentary teeth, apex sharp-pointed, stomata 

 on each surface ; resin canals median ; basal sheath persistent, 

 about I in. long on the younger leaves, reduced to ^ in. on the 

 oldest leaves. Cones variable in shape, usually narrowly conical, 

 3-5 in. long, lateral, solitary or in whorls, 2-3 whorls often appear- 

 ing on the same year's growth, persisting unopened for many 

 years, a single branch often bearing numerous clusters ; scales 

 thin, flat, the exposed part thickened and often elongated on the 

 outer side of the cone, armed with sharp prickles. Seed oval, 

 about I in. long, black, wing 1 in. long. 



The Knobcone pine appears to be most closely related to P. 

 radiata, but can be distinguished by its greyish, not light green 



