PINE FAMILY 43 



Arb. Britt. vol. 4, p. 2265, figs. (1838) ; Engelmann in Bot. Cal. vol. 2, p. 127. P. tiiberculata 

 Don, Trans. Linn. Soc. vol. 17, p. 442 (1837). 



17. P. tuberculata Gord. KNOB-CONE PINE. Tree 5 to 30 or sometimes 85 

 feet high, with slender trunks % to 1 foot in diameter and rather thin pale 

 yellow-green foliage; needles in 3s, 3 to 5 inches long; staminate catkins 

 brownish purple, narrowly conic, 5 to 7 lines long, 50 to 60 in spike-like clusters ; 



a 



Fir;. 6. Pixus RADIATA Don. a, Open cone; &, seed. nat. size. 



ovulate catkins dark-red or straw-brown, on peduncles % to 1 inch long, 3 to 

 5 (or 7) in a whorl, 1 to 3 whorls formed on a season's shoot; cones strongly 

 denexed, buff in color, narrowly ovate, oblique, acutely or bluntly pointed and 

 somewhat curved, especially at tip, 3 to 6 inches long; scales moderately thick- 

 ened at tip, except on the outside towards the base where they are raised into 

 conspicuous rounded or pointed knobs ; umbos small and contracted into slender 

 prickles \vhich, on old cones, weather away or persist towards the apex ; seeds 

 brownish black, 3 to 4 lines long, the surface minutely roughened, the wing 9 

 to 12 lines long and 3 to 4 lines broad ; cotyledons 5 to 8. 



