| 摘要 |
This new varietal sport of Fraxinus pennsylvanica summit green ash has been produced asexually from a sport branch of 'Summit' green ash (Fraxinus pennsylvanica 'Summit') found growing on a tree at Madison, Wis. with the characteristic of many lateral branches growing from a main branch or limb axis. Propagation by me asexually from this sport produced vigorous straight-growing trees with a strong central leader, an adnormally high number of lateral branches, many appearing at three inch intervals on the main stem. These laterals grew in a strongly ascending manner producing semi-lustrous dark green foilage, turning yellow in the fall, and tree crown with a ratio of 15 to 20% of the height in width, much narrower than asexual progeny of Summit ash of the same age and size.
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