The margin is the outside edge of the leaf, and the veins extend from the petiole up through the leaf to transport water.A petiole is the little stem that attaches the leaf to the branch of the tree.Lobes on a leaf are projections that extend from a central point, like fingers.Vertrees also grouped all dwarf plants together, and had a final category called “other” for everything else.īoth classification systems are generally based on the division of the leaf lobes, variegation, and color.īefore we jump in, we need a quick leaf anatomy lesson so we are all on the same page with these terms: The five categories that overlap between Vertrees’ and the Maple Society’s are: amoenum, dissectum, linearilobum, matsumurae, and palmatum. Vertrees, a highly respected entomologist, grower, and educator based in Oregon who is generally thought of as one of the most knowledgeable Japanese maple experts in the West, grouped the plants into seven categories.įive of his categories are used by the Maple Society today, plus twelve more. capilipes, and more, along with their hybrids. palmatum is the most common, but you’ll also see the species A. This system is particularly helpful because these plants may come from one of numerous Acer species that are indigenous to Japan.Ī. They have officially broken up the broad category of Japanese maples into 17 groups, using the system defined by noted expert Cor van Gelderen, and building on the work of nurseryman Benoit Choeau. The Maple Society is a United Kingdom-based group that registers new cultivars in the Acer genus, and taps into the expertise of botanists and Japanese maple experts around the world. Using their system, you’d know if you were looking at a correctly labeled atropurpureum that it would stay red all summer long. Clearly, there was a gap in the Japanese maple world that led to some labeling confusion.
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