|University of California, Berkeley|
|Jepson eFlora: Taxon page
Key to families | Table of families and genera
Index to accepted names and synonyms:
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|Family: Pinaceae||View Description||Dichotomous Key|
|Genus: Pinus||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Pinus ponderosa Douglas ex Lawson & C. Lawson
Stem: trunk generally < 68 m, generally < 2.2 m wide; branched in lower 1/2 when mature or not; mature bark furrows shallow, well spaced, forming plates, outer scales with +- yellow inner surfaces; mature crown short, conic or flat-topped; buds resinous, scales red-brown, dark-hairy. Leaf: (2)3 per bundle, 12--26 cm, < 2 mm thick, +- or not glaucous, deep yellow-green; sheath persistent. Seed Cone: +- spreading or recurved, 7--15(18) cm, ovate to +- conic, when immature green-brown to dark purple; stalk < 2 cm, persistent with proximal scales; scales generally darker abaxially than adaxially, in open cone well separated to very crowded; knob prickles < 3 mm, straight or outcurved; bracts with light brown fringing hairs. Seed: < wing.
Unabridged Note: Because the neotype of Pinus ponderosa actually is a Washoe pine cone, a different name for Pacific Ponderosa pine would have been needed had the name Pinus ponderosa not been conserved with a different type by recent, special botanical legislation.
eFlora Treatment Author: J. Robert Haller & Nancy J. Vivrette
Jepson Online Interchange
Previous taxon: Pinus muricata
Next taxon: Pinus ponderosa var. pacifica
Citation for this treatment: J. Robert Haller & Nancy J. Vivrette 2016. Pinus ponderosa, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=38293, accessed on September 28, 2016.
Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on September 28, 2016.