Pinus patula Schiede ex Schltdl. & Cham.
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Authority
Farjon, Aljos K. & Styles, Brian T. 1997. Pinus (Pinaceae). Fl. Neotrop. Monogr. 75: 1-291. (Published by NYBG Press)
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Family
Pinaceae
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Scientific Name
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Description
Species Description - Tree, usually tall, height to 35-40 m, dbh to 90100 cm. Trunk monopodial, erect, straight, slender, terete, commonly free of branches for 2/3 or more of its length. Bark thick, rough and scaly, with large elongated plates and deep, longitudinal fissures especially on the lower part of the bole, dark grey-brown below, lighter above, on young trees and branches thin, scaly, reddish brown. Branches of first order long, slender, spreading or slightly ascending; of higher orders slender, drooping or subpendulous, the ultimate branches pendent, forming a conical to domed, open crown. Shoots often multinodal, rough and scaly when the leaf fascicles have fallen; foliage shoots with prominent, decurrent pulvini, yellowish brown to reddish brown. Cataphylls subulate, recurved at apex, scarious, with erose-ciliate margins, brown, early deciduous. Vegetative buds oval-oblong to cylindrical, the terminal bud 15-20 mm long, the laterals shorter, brown, not resinous; the scales spreading, subulate, ciliate at margins. Fascicle sheaths initially long, 20-30 mm, with 6-8 imbricate, chartaceous, whitish yellow to orange-brown scales, persistent but reduced to 12-15 mm in mature fascicles, tight, slowly weathering to grey-brown. Leaves in fascicles of 3-4(-5), in drooping tufts, typically in two rows on either side of the upturned shoot, persisting 2-3 years, thin, lax, drooping to pendent, (11-) 15-25(-30) cm X 0.7-0.9(-l) mm, serrulate at the margins, acute, pale green to dark green. Stomata on all faces of the leaves, in 4-6(-7) lines on the convex abaxial face and 2-3(-4) lines on each adaxial face. Leaf anatomy: Transverse-triangular to triangular in cross section; the hypodermis usually with a double layer of cells; resin ducts (l-)2-3(-4), medial, occasionally 1 internal, stele oval in cross section; outer walls of endodermal cells not thickened; vascular bundles 2, distinct, the xylem strands often connate. Pollen cones crowded near the proximal end of new shoots, spreading, subtended by scarious bracts, ovoid-oblong to cylindrical, 15-20 X 5-6 mm, pinkish yellow, turning yellowish brown. Seed cones subterminal or lateral, in whorls of 2 to many, rarely solitary, persistent or deciduous, on short or moderately long (to 20 mm) peduncles. Immature cones ovoid, on short, or long, recurved peduncles with persistent cataphylls, purplish, soon light brown, maturing in two seasons. Mature cones (narrowly) ovoid or ovoid-attenuate when closed, usually slightly curved, more or less asymmetrical at base, 5-10(-12) X (3-)4-6.5 cm when open. Seed scales ca. 100-150, serotinous or parting some time after maturing, tenacious or deciduous with the peduncle, (thin) woody, oblong, usually curved when spreading, the proximal scales connate, purplish brown to dark brown, with light brown marks of seed wings adaxially. Apophysis nearly flat to slightly raised, transversely keeled, more or less gibbous on the proximal scales, more so on one side of the cone, rhombic to obtrullate in outline, upper margin acute or obtuse-rounded, abaxial surface striate or smooth, (lustrous) ochraceous or yellowish brown. Umbo dorsal, flat or raised, often sunken into the apophysis, 3-7 mm wide, grey, with a minute, deciduous prickle. Seeds obliquely ovoid, flattened, 4-6 X 2-4 mm, blackish grey. Seed wings articulate, held to the seed by two oblique claws which partly cover the seed on one side, obliquely ovate-oblong, 12-18 X 58 mm, light brown with dark stripes. Number of cotyledons not observed.
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Distribution
Mexico: In Tamaulipas, Querétaro, Hidalgo, México, Distrito Federal, Morelos, Tlaxcala, Puebla, Veracruz, Oaxaca, and Chiapas.
Mexico North America|