New York Metropolitan Flora

Key to the genera of Pinaceae

1. Needles solitary...2
1. Needles in clusters of 2 or more...5

2. Needles attached directly to stem, leaving a smooth, rounded scar upon detachment...3
2. Needles attached to persistent, minutely elevated or projecting peg-like woody structures (sterigmata)...4

3. Buds rounded, usually resinous; cones upright; cone scales without prominent lobes...Abies
3. Buds pointed, not resinous; cones pendulous; cone scales with 3 prominent lobes, the middle lobe long and narrow...Pseudotsuga

4. Needles quadrangular in cross section...Picea
4. Needles flat in cross section...Tsuga

5. Needles in cluster of 10-60, deciduous...Larix
5. Needles in clusters of 2-5, evergreen...Pinus

List of Pinaceae Genera

References to Pinaceae

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• Argus, G. 1973. Pinus banksiana Lamb. or Pinus divaricata (Aiton) Dumont? Taxon 22: 318-319.
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