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Key L: epiphytic angiosperms {Note that epiphytic Pteridophytes are not re-keyed here; seek them in Keys A4 and A6}

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1 Stems yellow to bright orange, lacking leaves
1 Stems green or brown, with leaves (scale-like or larger).
  2 Leaves opposite, orbicular or oblanceolate, rounded at the apex; [Eudicots]
  2 Leaves alternate, either orbicular or oblanceolate (rounded at the apex), or scale-like, or elongate and tapering, or lanceolate-elliptic.
    3 Leaves orbicular, rounded at the apex; [Basal Angiosperms]
    3 Leaves either scale-like, or elongate and tapering, or lanceolate-elliptic; [Monocots].
      4 Plants long-pendent, growing in variously abundant clumps draped along the branches of trees, the leaves densely gray and scaly
      4 Plants primarily erect, not long-pendent nor growing as long pendent clumps draping from trees or other hosts, the leaves variously colored and textured (including sometimes gray and scaly).
        5 Leaves either scale-like or elongate and tapering (the leaves often erect and stiffened); plants with bulbous bases but lacking pseudobulbs (often, but not always with a "vase-like" appearance in which water pools); flowers radially symmetrical
        5 Leaves lanceolate-elliptic; plants with variously-shaped bases, often bearing pseudobulbs (although not always); flowers bilaterally symmetrical, the corolla bearing a specialized lip (labellum)