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Key to Harrisia

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image of plant
Show caption*© Keith Bradley
1 Flower buds with brown hairs; scales of flower tube with axillary tufts of stiff, tawny brown hairs; fruits dull yellow when ripe; [w. coast of peninsular FL]
1 Flower buds with white hairs; scales of flower tube with axillary tufts of soft, white hairs; fruits dull red or orange-red when ripe; [s. and e. coast peninsular FL].
image of plant
Show caption*© Keith Bradley
  2 Flower tubes mostly 18-20 cm long, smooth, not ridged or scarcely so; scales of the flower tube flat or nearly so; fruits obovoid, 60 mm in diameter
image of plant
Show caption*© Keith Bradley
  2 Flower tubes mostly 10-15 cm long, prominently ridged; scales of the flower tube turgid at the base; fruits depressed spherical, 40-60 mm in diameter