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No key was found for the requested taxon, but it has only one child: Pseudotsuga menziesii var. glauca. Showing where it is keyed below.

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Key to Pinaceae

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1 Leaves either borne in fascicles of 2-5 (basally bound by a scarious sheath) or on short shoots in clusters of many leaves in apparent whorls.
  2 Leaves borne in fascicles of 2-5 (basally bound by a scarious sheath); [subfamily Pinoideae]
  2 Leaves borne on short shoots in clusters of many (>10) leaves in apparent whorls.
    3 Leaves evergreen; cones 6-12 cm long; [subfamily Abietoideae]
    3 Leaves deciduous; cones 1-2 cm long; [subfamily Pinoideae]
1 Leaves alternate.
      4 Leaves 4-angled in cross-section; [subfamily Pinoideae]
      4 Leaves distinctly flattened (2-sided) in cross-section.
        5 Leaves jointed, on short, persistent base; cones 1-3.8 cm long, pendent; [subfamily Abietoideae]
        5 Leaves attached directly to twig; cones 4-15 cm long, erect (Abies) or pendent (Pseudotsuga)
          6 Seed cones erect, disintegrating scale by scale and leaving the cone axis as a persistent spike on the tree; [subfamily Abietoideae]
          6 Seed cones pendent, falling whole from the tree; [subfamily Pinoideae]
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