Difference between revisions of "Pinus quadrifolia"
U.S.D.A. Div. Forest. Bull. 14: 17. 1897.
Common names: Parry pinyon piñón
Basionym: Pinus parryana Engelmann
Synonyms: Pinus cembroides var. parryana VossPinus juarezensis Lanner
Treatment appears in FNA Volume 2.
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| − | --><span class="statement" id="st- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Trees </b>to 10m; trunk to 0.5m diam., straight, much branched; crown dense, becoming rounded. <b>Bark</b> red-brown, irregularly furrowed and cross-checked to irregularly rectangular, plates scaly. <b>Branches</b> spreading to ascending, persistent to trunk base; twigs slender, pale orange-brown, puberulent-glandular, aging brown to gray-brown. <b>Buds</b> ovoid, light red-brown, ca. 0.4–0.5cm, slightly resinous. <b>Leaves</b> (3–)4(–5) per fascicle, persisting 3–4 years, (2–)3–6cm × (1–)1.2–1.7mm, curved, connivent, stiff, green to blue-green, margins entire to minutely scaly-denticulate, finely serrulate, apex subulate, adaxial surfaces mostly strongly whitened with stomatal bands, abaxial surface not so but 2 subepidermal resin bands evident; sheath 0.5–0.6cm, scales soon recurved, forming rosette, shed early. <b>Pollen</b> cones ovoid, ca. 10mm, yellowish. <b>Seed</b> cones maturing in 2 years, shedding seeds and falling soon thereafter, spreading, symmetric, ovoid before opening, broadly ovoid to depressed-globose when open, (3–)4–8(–10)cm, pale yellow-brown, sessile to short-stalked, apophyses thickened, strongly raised, diamond-shaped, transversely keeled, umbo subcentral, low-pyramidal or sunken, blunt. <b>Seeds</b> obovoid, body ca. 15mm, brown, wingless.</span><!-- |
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|genus=Pinus | |genus=Pinus | ||
|species=Pinus quadrifolia | |species=Pinus quadrifolia | ||
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Revision as of 13:16, 27 July 2019
Trees to 10m; trunk to 0.5m diam., straight, much branched; crown dense, becoming rounded. Bark red-brown, irregularly furrowed and cross-checked to irregularly rectangular, plates scaly. Branches spreading to ascending, persistent to trunk base; twigs slender, pale orange-brown, puberulent-glandular, aging brown to gray-brown. Buds ovoid, light red-brown, ca. 0.4–0.5cm, slightly resinous. Leaves (3–)4(–5) per fascicle, persisting 3–4 years, (2–)3–6cm × (1–)1.2–1.7mm, curved, connivent, stiff, green to blue-green, margins entire to minutely scaly-denticulate, finely serrulate, apex subulate, adaxial surfaces mostly strongly whitened with stomatal bands, abaxial surface not so but 2 subepidermal resin bands evident; sheath 0.5–0.6cm, scales soon recurved, forming rosette, shed early. Pollen cones ovoid, ca. 10mm, yellowish. Seed cones maturing in 2 years, shedding seeds and falling soon thereafter, spreading, symmetric, ovoid before opening, broadly ovoid to depressed-globose when open, (3–)4–8(–10)cm, pale yellow-brown, sessile to short-stalked, apophyses thickened, strongly raised, diamond-shaped, transversely keeled, umbo subcentral, low-pyramidal or sunken, blunt. Seeds obovoid, body ca. 15mm, brown, wingless.
Habitat: Dry rocky sites
Elevation: 1200–1800m
Distribution
Calif., Mexico in Baja California.
Discussion
Pinus quadrifolia is the rarest pinyon in the flora. It hybridizes naturally with P. monophylla.
Selected References
None.
Lower Taxa
None.