Mountain Maple leaves are green and hairless above.The base of the leaf is rounded to heart-shaped. The lobes are broad, with shallow, broadly v-shaped sinuses Sinus: In leaves with lobes, the indented area between two lobes. and coarse teeth Teeth: The saw-toothed edges of a leaf. Lobed leaves are leaves with distinct protrusions, either rounded or pointed. Mountain Maple leaves have three (occasionally five) lobes Lobe: A projection from an edge of a plant structure (such as a leaf), larger than a tooth. is 2¾ to 3½ inches long and nearly as wide. The leaf blade Blade: The broad, flat portion of a leaf, where photosynthesis occurs.The leaves are opposite Opposite Leaves: Leaves occurring in pairs at a node, with one leaf on either side of the stem., meaning that there are two leaves per node along the stem.Mountain Maple leaves are simple Simple Leaf: A leaf with a single undivided blade, as opposed to a compound leaf, which is one that is divided to the midrib, with distinct, expanded portions called leaflets., meaning that they are not separated into leaflets. Mountain Maple ( Acer spicatum) on the Heart Lake Trail (28 June 2017). Trees of the Adirondacks: Mountain Maple leaves usually have three lobes, with coarse teeth and a network of delicate veins. Mountain Maple has a short, crooked trunk, often branching near the base into several ascending branches, and a small, rounded crown. Mountain Maple is a deciduous understory tree, which is sometimes classified as a shrub. The author name (Lamarck) is a reference to French biologist Jean-Baptiste Lamarck, who died in 1829. Mountain Maple may also be referred to as Moose Maple – a reference to the plant's use as a winter browse by Moose. Other common names for Mountain Maple include Low Maple, Water Maple, and Eastern Mountain Maple. The genus name ( Acer) is the Latin word for "maple." The species name ( spicatum) means "spike-bearing." This is a reference to the spike-like flower clusters that appear after the leaves are fully formed.
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