Dichotomous Key/Pinaceae

1: Pinaceae
 * 2: Cones biennial, rarely triennial, with each year's scale growth distinct, forming an umbo on
 * each scale. Cone scale base broad, concealing the seeds fully from abaxial view. Seed without
 * resin vesicles. Seed wing holding the seed in a pair of claws. Leaves with primary stomatal
 * bands adaxial (above the xylem) or equally on both surfaces.......................................................Pinus


 * 2: Cones annual, without a distinct umbo. Cone scale base broad, concealing the seeds
 * fully from abaxial view. Seed without resin vesicles, blackish. Seed wing holding the seed
 * loosely in a cup. Leaves with primary stomatal bands adaxial (above the xylem) or equally on
 * both surfaces.........................................................................................................................Picea


 * 2: Cones annual, without a distinct umbo. Cone scale base broad, concealing the seeds fully
 * from abaxial view. Seed without resin vesicles, whitish. Seed wing holding the seed tightly in a
 * cup. Leaves with primary stomatal bands abaxial (below the phloem vessels) only........Subfamily Laricoideae


 * 2: Cones annual, without a distinct umbo. Cone scale base narrow, with the seeds partly visible
 * in abaxial view. Seed with resin vesicles. Seed wing holding the seed tightly in a cup. Leaves
 * with primary stomatal bands abaxial (below the phloem vessels) only..........................Subfamily Abietoideae