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Keys
Vascular plant groups
Club mosses
Ferns
Vegetative key to families
Gymnosperms
Flowering plants
Genera
Families
Cyperaceae
Leaf
sheath
closed or rarely open and then the
perianth
reduced to bristles or
minute
scales
Cyperaceae
consider the other alternative
Flowers
bisexual
or unisexual but never enclosed in a
utricle
and never apparently separated into unisexual spikelets
consider the other alternative
Spikelets with more than 2 perfect flowers
choose this alternative
reject this alternative
Perianth
scales often numerous but always with 2
lateral
ones
keeled
or at least concave; usually a number of flat ones inside these
lateral
scales
choose this alternative
reject this alternative
Perianth
scales very rarely more than 6 or absent;
lateral
scales not
keeled
and scarcely concave