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Keys
Vascular plant groups
Club mosses
Ferns
Vegetative key to families
Gymnosperms
Flowering plants
Genera
Families
Rubiaceae
Leaves apparently whorled or
opposite
with
interpetiolar
stipules
Rubiaceae
consider the other alternative
Flowers not united with each other
consider the other alternative
Herbs
consider the other alternative
Stipules leaf-like forming what appear to be whorls of “leaves” at the nodes
consider the other alternative
Corolla
rotate
with a very short tube
Galium
choose this alternative
reject this alternative
“Leaves” mostly more than 6 in each
whorl
; may be less on flowering stems. Annuals
choose this alternative
reject this alternative
“Leaves” 6 or less in each
whorl