Pinus ponderosa : geographic races and subspecies based on morphological variation / Robert Z. Callaham.

Format:

Book

Government document

Author/Creator:

Callaham, Robert Z., author.

Contributor:

Pacific Southwest Research Station, issuing body.

Series:

Research paper PSW ; 265.

Research paper PSW ; 265

Language:

English

Subjects (All):

Ponderosa pine--United States--Classification.

Ponderosa pine.

Ponderosa pine--United States--Identification.

Ponderosa pine--Classification.

Ponderosa pine--Identification.

United States.

Genre:

Classification

Field guides

Physical Description:

1 online resource (ii, 53 pages) : maps.

Other Title:

Geographic races and subspecies based on morphological variation

Place of Publication:

Albany, CA : United States Department of Agriculture, Forest Service, Pacific Southwest Research Station, September 2013.

Summary:

"Morphological variation of ponderosa pine (Pinus ponderosa Dougl. ex Laws.), growing north of Mexico, is described. A map shows distributions of five putative races that are analyzed and discussed. Characteristics of branches, shoots, and needles were measured for 10 or fewer trees growing on 147 plots located at 1,500-ft elevational intervals along latitudinal transects. Characteristics of cones were measured from 120 of these plots. Cones from 78 plots yielded seeds for study. Subspecific boundaries were based on both visual interpretations for many traits and statistical cluster analyses of plot means. Boundaries were tested for appropriateness by multiple discriminant analyses. Univariate analyses of variance and stepwise discriminant analyses selected characteristics most capable of differentiating among hypothesized races. On average, 98 percent of plots were correctly classified as to race. Characteristics most capable of differentiating among the hypothesized races were selected. Characteristics of trees in three common-garden plantings were analyzed to determine the genetic basis of foliar characteristics measured on trees in situ. Results of analyses and review of literature confirm existence of five morphologically distinct, geographic taxa and four transition zones."

Notes:

Title from title screen (viewed on No. 6, 2013).

Includes bibliographical references.

Other Format:

Print version: Callaham, Robert Z. Pinus ponderosa

OCLC:

862154777