Time of Flowering and Seed Ripening in Southern Pines (Classic Reprint) - Softcover

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Excerpt from Time of Flowering and Seed Ripening in Southern Pines

Interest of botanists in phenology, which can be defined as the science of the relations between climate and periodic biological phenomena, has been active for years. In 1915, Lamb (g) published in chart form for a great many species the time of leafing, full foliage, flowering, seed ripening, seed falling, and leaf falling. In 1953, Duffield (5) revised an earlier publication, giving pine pollen collection dates with data on annual and geographic variation based on observation at the Institute of Forest Genetics in California. He states that Pinus ponderosa on the west slope of the Sierra Nevada show a difference of 8days in pollen collection per 1, ooo-feet difference in elevation, and that his figure agrees moderately well with Hopkins' (5) constant of 4 days for each 400-feet difference in elevation. The order of bloom of trees and shrubs at the Arnold Arboretum has been given by Wyman A method for describing and comparing blooming seasons has been given by Anderson and Hubricht(1).

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