TREES AND SHRU1 



PEHTJS GREGGII, Engelm. 



Pinus Greggii, Engelmann ex Parlatore, Be Candolle Prodr. xvi. pt. ii. 396 (1868). — Gordon, 



Pinetum, ed. 2, 270. — Engelmann, Trans. St. Louis Acad. Scl. iv. 177. — Hemsley, Bot. 



Biol. Am. Cent iii. 187. 

 Pintjs patula, var. Bentham, PI Hartw. No. 442, 58 (not Schlechtendal & Chamisso) 



(1840). — Loudon, Encycl. 993. 

 Pinijs patula, (3 stricta, Endlicher, Syn. Conif. 157 (1847).— Gordon, Gard. Mag. vi. 638; 



Pinetum, ed. 2, 279. — Carriere, Traite Conif. 329. 

 Pinus patula, var. macrocarpa, Masters, Gard. Chron. ser. 3, ix. f. 92 (1891). 



Leaves in fascicles of threes, slender, erect, serrate, from 7 to 10 centimetres long, their sheaths 

 short, pale chestnut-brown, persistent ; resin ducts medial, hypoderni very weak ; fibro- vascular 

 bundles double. Pistillate flower subterminal; one-year-old cones pseudo-lateral by the growth of 

 summer shoots, erect, stalked, in clusters of two, three or more, their scales armed with small 

 prickles usually deciduous from the mature cones. Mature cones appearing sessile by the 

 development of the basal scales, reflexed, oblique, very persistent, often serotinous for several 

 years, lustrous, of various shades of ochre yellow, from 6 to 12 centimetres long, their scales 

 more or less tumid, much larger on the outer side than on the side next to the branches, 

 sometimes irregularly developed, the umbo small and eccentrically placed near the base of the 

 apophysis. 



A tree, about 15 metres high, with long slender spreading branches, and small branchlets 

 covered with a glaucous bloom, the decurrent bases of the bracts at first conspicuous, becoming 

 gradually merged in the smooth gray persistent bark of the branches. 



Mexico : near Saltillo, J. Gregg (No. 402), 1847, C. G.Pringle (No. 10142), and G.B. Shaw, 

 November, 1905. 



Dr. Gregg's specimen, on which the species is founded, may be seen in the Engelmann collection at St. Louis and in 

 the Gray Herbarium where, in each case, the species is represented by a single cone and a very short branchlet bearing 

 leaves. Gregg found this Pine near Saltillo (incorrectly printed Sullillo in De Candolle's Prodromus), an important 

 city of Coahuila. In 1905, in company with Mr. Pringle, I collected the species on the slopes of the Cafion de las 

 Iglesias about five miles to the southeast of Saltillo. 



The cones of Pinus Greggii are remarkably like those of Pinus patula, Schlechtendal & Chamisso, in form, 

 reflexed position on the branch, persistence and tendency to cluster, but in color they are distinctly yellow rather than 

 brown. In both species the peduncle of the young cone becomes overgrown and concealed by the basal scales. In 

 habit there could be no greater contrast than between the short erect sparse foliage of Pinus Greggii and the dense 

 pendent long leaf masses of Pinus patula. They differ quite as much in the bark of their branches and trunks. For 

 a number of years the bark of Pinus Greggii persists and grows with the increasing diameter of the wood, and the 

 upper trunk and branches are as smooth and as gray as the bark of Pinus glabra, Walter, of southeastern North 

 America. The bark of Pinus patula, on the contrary, is continuously deciduous for several years, and its upper trunk 

 and branches, like those of Pinus sylvestris, Linnaeus, and Pinus densiflora, Siebold & Zuccarini, are conspicuously red. 



The original description of Pinus patula (Linncea, vi. 354 [1831]) does not mention the bark. Loudon (Encycl. 

 992 [1842]) describes " the branches covered with a smooth lead-colored and persistent epidermis," a description that 

 applies perfectly to Pinus Greggii and to no other known Mexican Pitch Pine. Carriere, Parlatore, and Gordon have 

 wholly or partly adopted Loudon's description of the bark of Pinus patula. On the other hand, Veitch's Manual of 

 Conifers (ed. 2, 355), whose author had profited by an examination of the fine cultivated specimens in the British Isles, 

 describes the " light reddish brown branches " of Pinus patula. An explanation may perhaps be found here for the 



