| ||||||
| ||||||
Pinus strobiformis Engelm.Southwestern white pine |
|---|
| Links |
We parsed the following live from the Web into this page. Such content is managed by its original site and not cached on Discover Life. Please send feedback and corrections directly to the source. See original regarding copyrights and terms of use. |
| Names | |
| |
| Following modified from The Gymnosperm Database |
Tree 16m tall, S of El Salto, Durango (23.8846°N, 105.1168°W) [C.J. Earle, 2007.02.10].
Tree 12-13 m tall on Cerro Potosí, Nuevo León [C.J. Earle, 2007.02.19].
Bark on a 30 cm dbh tree near El Salto, Durango [C.J. Earle, 2007.02.10].
Cones on a tree high in the mountains of Chihuahua (28.2761°N, 108.2608°W) [C.J. Earle, 2007.02.08].
Cone in situ an a tree on Cerro Potosí, Nuevo León [C.J. Earle, 2007.02.19].
Saplings of (left to right) P. culminicola , P. hartwegii and P. strobiformis growing together on Cerro Potosí, Nuevo León [C.J. Earle, 2007.02.20].
Distribution map ( USGS 1999 .
Pinus strobiformis Engelmann 1848 Common namesMexican white pine, southwestern white pine ( Elias 1987 ), pino blanco, pinabete ( Perry 1991 ), pino enano ( Kral 1993 ). Taxonomic notesSyn: Pinus ayacahuite Ehrenberg var. brachyptera G.R. Shaw; P. ayacahuite var. reflexa (Engelmann) Voss; P. ayacahuite var. strobiformis (Engelmann) Lemmon ( Kral 1993 ). See below. This is a typical white pine in section Strobus , subsection strobi . This species is closely related to Pinus flexilis , with which it forms the hybrid Pinus flexilis var. reflexa ( Farjon and Styles 1997 ). In 2008, Michael Frankis described a new species, Pinus stylesii Frankis ex Businský, from Cerro Potosí and neighboring mountain ranges, chiefly in Nuevo León, Mexico. I believe that this taxon is derived from the hybridization of P. strobiformis and P. flexilis , and have reduced it to synonymy with Pinus flexilis var. reflexa , although in actuality it probably lies somewhere between typical P. flexilis var. reflexa and typical P. strobiformis . The full story is given on the P. flexilis page. DescriptionTrees to 15-24(30) m tall and 50-90 cm diameter, slender, straight; crown conic, becoming rounded to irregular. Bark smooth and silvery gray on young trees, aging to a dark grayish brown, furrowed, divided into rough rectangular plates. Branches spreading-ascending; twigs slender, pale red-brown, puberulous or glabrous, sometimes glaucous, aging gray or gray-brown, smooth. Buds ellipsoid, red-brown, ca. 1 cm, resinous. Needles 5 per fascicle, spreading to ascending-upcurved, persisting 3-5 years, 4-10 cm × 0.6-1 mm, straight, slightly twisted, pliant, dark green to blue-green, abaxial surface without evident stomatal lines, adaxial surfaces conspicuously whitened by narrow stomatal lines, margins sharp, razorlike and entire to finely serrulate, apex narrowly acute to short-subulate, resin canals 2-4, external; sheath 1.5-2 cm, shed early. Staminate cones cylindric, ca. 6-10 mm, pale yellow-brown. Ovulate cones maturing in 2 years, shedding seeds and falling soon thereafter, pendent, symmetric, lance-cylindric before opening, broadly lance-cylindric when open, 15-25 cm, creamy brown to light yellow-brown, stalks to 6 cm; apophyses somewhat thickened, strongly cross-keeled, tip reflexed; umbo terminal, low. Seeds ovoid; body 10-13 mm, red-brown, essentially wingless. 2 n =24 ( Little 1980 , Perry 1991 , Kral 1993 ). RangeUS: Arizona, New Mexico, Texas; Mexico: Coahuila, Nuevo León, Sonora, Chihuahua, Sinaloa, Durango; at 1900-3000 m. Habitat dry rocky slopes in high mountains, or as a minor component in mixed conifer forests. In the United States such habitat occurs on isolated desert mountain ranges, and in Mexico it is widespread in both the Sierra Madre Occidental and Oriental. Within habitat, it mostly grows on moist, cool sites with associates such as P. hartwegii , and P. culminicola ( Little 1980 , Perry 1991 , Kral 1993 ). See also Thompson et al. (1999) . Big treeIn the United States: diameter 150 cm, height 34 m, crown spread 19 m, located in Lincoln National Forest, NM ( American Forests 1996 ). Since the great majority of the species' range is in Mexico, larger trees may be found there. OldestTree VPK02 collected in the San Mateo Mountains of New Mexico by Henri Grissino-Mayer, J. Speer, and K. Morino had a crossdated age of 599 years ( RMTRR 2006 ). DendrochronologyEthnobotanyThe seeds were eaten by natives of the southwest U.S. ( Little 1980 ). It is locally (in Mexico) used for cabinetry, doors and window frames ( Perry 1991 ). ObservationsIn the United States, it can be found near the summits of the Chiricahua Mountains and probably in other high ranges of southern Arizona. In Mexico, Perry (1991) recommends the following locations:
As referenced in the photos at left, I have also found fine occurrences of it in the high passes on Mex-16 between Hermosillo and Chihuahua and in Durango about 20 km S of the town of El Salto. No guides or fancy vehicles needed for these sites! RemarksWhite pine blister rust . ( Cronartium ribicola ), an introduced fungal disease, attacks this and certain other white pines ( Little 1980 ). This species is the primary hosts for the dwarf mistletoe Arceuthobium blumeri , which extends from southern Arizona south through Durango and east to Cerro Potosí in Nuevo León ( Hawksworth and Wiens 1996 ). CitationsSee also
Back | Site map | Contact us
Edited by Christopher J. Earle Page updated on 2009.03.23
URL: http://www.conifers.org/pi/pin/strobiformis.htm |
| Following modified from Uni-bonn |
| &pull 20q v4.662 20091102: Error 404 Not Found http://www.botanik.uni-bonn.de/conifers/pi/pin/strobiformis.htm |
| Following modified from Virginia Tech Forestry Department |
|
| Following modified from Plants Database, United States Department of Agriculture |
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Discover Life | Top |
| © Designed by The Polistes Corporation |
Back to top
Printer-Friendly
