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1.a. Leaves needle-like; in fasicles on short shoots. 2. 1.b. Leaves flat or square in cross-section; not in fascicles. 3. 2.a. Leaves evergreen, in fascicles of 2 or 4. Pinus 2.b. Leaves deciduous, numerous and crowded on short lateral shoots. Larix 3.a. Leaves persistent on dry branches; twigs with round, flat leaf scars; resin blisters prominent on the trunks. Abies 3.b. Leaves falling readily from dry branches; twigs rough with persistent peg-like leaf scars; trunks without prominent resin blisters. 4. 4.a. Leaves flattened, rounded at apex, distinctly short-stalked on peg-like base. Tsuga 4.b. Leaves square in cross-section, acute or sharp-pointed, sessile on peg-like base. Picea |
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© Wisconsin State Herbarium, UW-Madison
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