Its huge leaves are 6 – 12” (up to 24”) across and have five deeply cut palmate lobes that typically each have 1-2 lobes or lobules of their own. Usually, however, they only reach about 75 ft tall. It grows well in full sun or partial shade.īigleaf Maple is our largest maple, with the largest specimens reaching 158 ft tall and a trunk diameter of 12 ft. It is native to the Pacific Northwest, where it grows at low to middle elevations in riparian areas and open mixed or coniferous forests within 190 miles of the coastline. It is a large, beautiful tree with huge leaves, and it is always covered with an array of epiphytic mosses, clubmoss, lichens, and ferns. To say that Bigleaf Mapleis an impressive tree would be putting it mildly. Occasionally maple leaf margins are entire, without any teeth at all. If the tooth cuts less than ¼ of the distance to the midvein, it is a large tooth. If the distance it cuts is more than ¼ of the distance to the midvein, it is a lobule. The distinction between a large tooth and a lobule is a bit more subjective but follows a 25% rule. Another way to look at it is that in palmate leaves, a lobe typically has a main vein running to it, while a lobule typically does not. A lobule is different from a lobe because a lobule is a projection of a lobe rather than a stand-alone feature. In many maples, the teeth become so large they are often referred to as lobules meaning small lobes. Sometimes the teeth are almost crenate (rounded-toothed, smooth, not jagged or sharp) or crenate-serrate, where they are somewhere in between. Sometimes they are double-serrated, where the teeth have teeth of their own. The teeth can be very small or fine, or often they are widely spaced and large. Maple leaves are often serrated with sharp, jagged saw-like teeth. Identifying Maple Trees by Their Leaf Margins
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