Trees of Wisconsin
Key to Gymnosperms of Northeastern Wisconsin
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16a. Twigs pubescent with short, stiff hairs--use hand lens; cones 2.5 cm or less in length. Native species, usually in swamps or bogs.
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Picea mariana (Black Spruce) | ||
16b. Twigs glabrous; cones longer than 2.5 cm. Native or alien, various habitats. |
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17. |
