28 



THE PINES OF MEXICO. 



10. PIN US GREGGII Engelm. 



Pinus GREGGII Engelmann, ex Parlatore DC. Prodr. xvi, pt. 2, 396 (1868). Engelmann, 



Trans. St. Louis Acad. Sci. iv, 17.7 (1880). Hemsley, Bot. Biol. Cent. Am. \\\, 187(1883). 



Shaw. Sargent Trees <2f Shrubs ii, 53. t. 124 (1907). 



Pints patula /8 stricta Bentham ex Endlicher Syn. Com'/. 157 (1847). 



Pints i. villa var. macrocarpa' Masters, Gard. Chron., ser. 3, ix, 438, fig. 92 (1891). 



Leaves with persistent sheaths, in fascicles of 3, 7-10 cm. long, erect, serrate ; resin ducts 

 medial : hypoderm of thin-walled, inconspicuous cells. Conelets subterminal, pedunculate, 

 single or aggregate, their scales armed with a small, usually deciduous prickle. Cones sub- 

 sessile, rerlexed, oblique, conical, 6-12 cm. long, persistent; apophyses tumid, unevenly devel- 

 oped, lustrous ochre-yellow. Seed-wing thickened at the base. Branchlets pruinose, the 

 decurrent bases of the bracts not prominent and becoming merged in the long-persistent 

 smooth gray bark of the young trees. 



A tree 10-15 metres in height, with short erect bright green leaves, smooth gray upper 

 trunk and persistent clustered cones, growing on the north eastern Sierras at cool temperate 

 altitudes. 



Gregg, 402 (type), Pringle, 10142, S/iaw, all near Saltillo, Coahuila. 



There are no specimens of this species in the Nelson & Rose collections. 



The conelets are subterminal at the time of flowering, after which the shoot elongates and leaves them in a 

 pseudo-lateral position at the end of the first season. Occasionally a true lateral conelet occurs, but the character 

 is not normal as it is with P. patula. 



Cones just before ripening change from green to a lustrous reddish-brown, not unlike the color of a dry 

 cone of P. halepensis, Miller, but quite unlike the purple black color of the cone of P. patula at the same stage of 

 development. The erect short sparse foliage and the smooth gray upper trunk of P. Greggii give the tree an 

 aspect totally different from that of P. patula, with its slender, long, drooping leaves and red scaly upper trunk. 

 The cone, however, is remarkably like that of P. patula and has the same subsessile attachment to the branch, 

 the long peduncle of the conelet being overgrown and concealed by the basal scales of the cone in both species. 



From the descriptions of Lambert and later authors it is evident that P. Greggii and P. patula have been long 

 confused. The peculiar gray, persistently smooth bark of P. Greggii forms part of their descriptions of P. patula t 

 The error must have arisen from Hartweg's specimens from Real del Monte, where P. Greggii might naturally 

 have been found before that mining property was deforested. 



PLATE XXI. 



Fig. 1, 2, 3. Cones from Saltillo. 

 " 4. Seeds from Saltillo. 

 " 5. Branch, leaves and conelets. 



Fig. 6. Leaf-section, magn. 30 diam. 

 " 7. Habit of the tree. 



