Pinus maximinoi

H.E. Moore 1966

Common names

Pino candelillo, ocote, pino canis, pinabete, pino llorón [Spanish].

Taxonomic notes

Syn: Pinus tenuifolia Benth. 1842 non Salib. 1796; P. escandoniana Roezl 1857; P. hoseriana Roezl 1857; P. tzompoliana Roezl 1857. Although Roezl was the first to describe this species, his herbarium material was lost until recently. In the interim, the name P. maximinoi became widely established, as this tree is widely used in plantation forestry. In order to avoid a disruptive and relatively pointless name change, Farjon and Frankis (1998) have proposed to conserve the binomial P. maximinoi. This would otherwise be the only valid binomial among the scores of pine species described by Roezl. For more on Roezl's role in the systematics of Mexican pines, see P. montezumae and Farjon and Styles (1997).

Description

Trees to 20-35(-50) m tall and 70-90(-100+) cm dbh. Trunk straight, round, usually single. Branches horizontal, often whorled, developing into an open pyramidal and, at maturity, a thick, rounded open crown, with typical crown depth about 50% of tree height. Bark first smooth, gray-brown, later becoming rough and deeply fissured into large gray-brown plates. Branchlets long, slender, flexible, slightly drooping, with prominent decurrent pulvini. Leaves persisting 2-2.5 years, in fascicles of 5 (rarely 4 or 6), very slender, drooping, 20-35 cm long, 0.6-1.1 mm wide, light to glaucous green; margins serrulate under a 10X lens; stomata in 2-3 lines on all three surfaces; (2-)3(-4) medial resin canals; diploxylon; fascicle sheaths orange-brown fading to gray, 15-25(-30) mm long, persistent. Pollen cones crowded near the proximal end of new leading (sometimes lateral) shoots, cylindrical, 30-40 × 5-8 mm, pink-brown, subtended by subulate-lanceolate brown bracts. Seed cones borne in groups of 3-4, light brown in first year, maturing in second year on 10-15 mm long peduncles, ovoid to long-ovate, asymmetrical, oblique, red-brown, (4-)5-10(-12) × 4-8 cm when open. Peduncle oblique to cone axis; cones mature in winter, shed seeds, and soon fall. Seed scales (100-)120-160, thin, flexible, weak; apophyses flat with a light transverse keel; umbo small, flattish, with a small early-deciduous prickle. Seeds dark brown, 4-6 × 3-4 mm, wing pale yellow-brown, articulate, 16-20 × 4-8 mm. Cotyledons 6-8 (Perry 1991, Farjon and Styles 1997).

Distribution and Ecology

Mexico: Chiapas, Colima, Durango, Guerrero, Hidalgo, Jalisco, México, Michoacán, Morelos, Nayarit, Oaxaca, Puebla, Sinaloa, Tlaxcala, Veracruz; Guatemala; Honduras; El Salvador; NW Nicaragua. The Sinaloa population is disjunct. Mainly occurs in mountains, but has wide ecological amplitude that includes an early seral or gap-pioneer role in wet subtropical forest, canopy species in cloud forests, or as a member of drier pine-oak forests and woodlands. Occurs at elevations of (450-)900-1800(2800) m, paradoxically occurring at the highest elevations near its northwest range limits. Occurs on widely varying but usually well-drained soils in areas with 900-2500 mm annual precipitation (summer maximum). On more mesic sites it commonly occurs with P. tecunumanii and Liquidambar styraciflua, and at lower altitudes with P. oocarpa, and on woodland sites it may be joined by P. devoniana and P. pseudostrobus with an understory of grasses or Pteridium aquilinum. Farther north in it is found with Abies religiosa, P. ayacahuite, P. patula, P. pseudostrobus, P. douglasiana and Quercus spp. on somewhat drier sites that are subject to occasional frosts (Farjon and Styles 1997).

Zone 10 (cold hardiness limit between -1°C and +4.4°C) (Bannister and Neuner 2001).

Remarkable Specimens

Ethnobotany

The species is logged along with associated hard pines for use as firewood and to produce hewn timbers (Perry 1991).

Observations

Perry (1991) notes that the species is very common and easily seen along many major highways. He notes particularly fine trees along highway Mex-15 from Toluca to Morelia, Patzcuaro and Uruapan. He also mentions trees along Mex-190 near San Cristobal de las Casas in Chiapas; in Guatemala along highway CA-1 near Guatemala City; in Honduras a few kilometers east of Tegucigalpa on Highway 4; and in El Salvador near the towns of La Palma and Chalatenango, near the Honduras border.

I have seen it to very good advantage on the eastern slopes of Nevado de Colima on the road to Ciudad Guzman; near Uruapan in Michoacán; and on highway Mex-40 between Mazatlan and Durango on the western ramparts (at about 2,500-3,000 m elevation) of the Sierra Madre Occidental.

In El Salvador, it occurs with Pinus oocarpa var. oocarpa on Cerro el Pital in La Palma town and above, at 900-1500 m elevation. While you're there, from 1500 to 2500 the forest is mixed with Pinus tecunumanii and Pinus pseudostrobus var. apulcensis, and above 2000 m it is easy to find pure and mixed forests of Pinus ayacahuite. Also in El Salvador, on Cerro Montecristo, there natural forests of Pinus maximinoi mixed with Pinus oocarpa var. oocarpa on the lowest peaks (Fernando Tobar email 2008.11.12).

Remarks

In southern Mexico and Guatemala, this species is a host to the dwarf mistletoe Arceuthobium globosum subsp. grandicaule (Hawksworth and Wiens 1996).

Citations

Farjon, Aljos and Michael P. Frankis. 1998. Proposal to conserve the name Pinus maximinoi (Pinaceae) against three competing binomials. Taxon 47: 733-734.

Moore, H.E. 1966. Nomenclatural notes on the cultivated conifers. Baileya 14: 1-11.

See also

Dvorak, W.S., E.A. Gutiérrez, W.J. Gapare, G.R. Hodge, L.F. Osorio, C. Bester and P. Kikuti. 2000. Pinus maximinoi. Pp. 106-127 in Conservation & Testing of Tropical & Subtropical Forest Tree Species by the CAMCORE Cooperative. Raleigh, NC: College of Natural Resources, NCSU.

López-Upton, Javier, and Jeffrey K. Donahue. 2003. Pinus maximinoi. Species description in the Tropical Tree Seed Manual. Available http://www.rngr.net/Publications/ttsm/Folder.2003-07-11.4726 (accessed 2007.08.31).