Online Virtual Flora of Wisconsin

Pinaceae

Kenneth J. Sytsma

Key to Pinaceae

1.a. Leaves needle-like; in fasicles on short shoots.

1.b. Leaves flat or square in cross-section; not in fascicles.

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.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

Species within Adams County 2016

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Pinaceae Kenneth J. Sytsma Key to Pinaceae 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 Species within Adams County 2016 Abies balsamea Larix laricina Picea mariana Pinus banksiana Pinus resinosa Pinus strobus Tsuga canadensis
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