PINE TREES OF ROCKY MOUNTAIN REGION. 33 
LONGEVITY. 
Western yellow pine is in general a long-lived tree, attaining an 
age of from 350 to 500 years. In the central and southern Rocky 
Mountain region, it appears to be shorter-lived than in the northern 
part of this region-and on the Pacific slope, trees in the central and 
southern regions probably not attaining an age of over 250 or 300 
years. 
APACHE PINE; ‘ ARIZONA LONGLEAF PINE.” 
Pinus apacheca Lemmon. 
COMMON NAME AND EARLY HISTORY. 
This comparatively rare species is practically unknown to settlers 
and other laymen, with whom, for the most part, it passes as “ yellow 
pine.” The name “Apache pine,” derived from the technical specific 
name, is a book name probably not yet used in the field, but one 
which may be appropriately adopted. “Arizona longleaf pine” has 
been applied by United States forest officers in the Arizona range 
of the tree, but as the species occurs elsewhere in our Southwest 
this name would seem to be inappropriate. 
Until recently Apache pine (Pinus apacheca') and the Mayr pine 
(P. mayriana) were believed to be distinct species. The writer is 
now convinced, however, that they are one species, which is distinct 
from other southwestern pines.” Dr. J. G. Lemmon discovered Pinus 
apacheca in 1881 in the Chiricahua Mountains, Arizona, and under 
this name he published a figure and description of it in 1894. Dr. 
Mayr next found it in 1887 in the Santa Rita Mountains, Arizona; 
and in 1889 it was described and named “ Pinus latifolia Sargent,” 
which, being found to be a synonym, was replaced in 1897 by ** Pinus 
mayriana.”*® As Dr. Lemmon’s name, Pinus apacheca, was published 
1Q#rithea, II, 103, Pl. II]. 1894. (See also footnote 1 in the present work, on p. 34. 
2 Pinus apacheca appears to be closely related to Pinus engelmanni Carriere, which is 
a Mexican species not known to occur in the United States. Dr. George Russell Shaw 
relates the Apache pine to our western yellow pine under the varietal name “ P. pon- 
derosa var. macrophylla,’ a name which appears to be preoccupied by Lindley’s Pinus 
macrophylla published in 1839, the latter now being considered a synonym of P. monte- 
sumae Lambert (1803). Later comparative study may possibly show that P. apacheca 
is a northern form of P. engelmanni Carr. In deseribing the latter tree Dr. Engelmann, 
who first characterized it asa new species, unfortunately under the preoccupied name 
_P. macrophylla, mentions the close resemblance it bears to P. australis (=P. palustris). 
In the opinion of the present writer the genera! appearance of the two trees is strikingly 
Similar; and, as is shown further on, the seedling growth (Pl. XXIV) of Pinus apacheca 
and P. palustris is very much alike and equally unlike the early growth of any other 
' southwestern pine. 
3 Nomenclature of the Arborescent Flora of the United States (Bull. 14, Division of 
Forestry), 21. 1897. 
61354°—Bull, 460—17——3 
