Needle Structure as an Aid in Distinguishing Colorado Blue Spruce from Engelmann Spruce

1 December 1931

journal article
research article
Published by University of Chicago Press in Botanical Gazette

Vol. 92 (4) , 446-449
https://doi.org/10.1086/334220

Abstract

The needles of both contain "short" resin canals arranged in longitudinal series, 2 series occurring in the basal half of the needles. In Picea punyens these series extend into (lie upper half of the needle, not so in P. engelmannii.

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