Contemporary Circumscription Compared with A Utah Flora 4th ed.
Bio430
Rubiaceae
No differences.
Key Features
In our temperate regions, Rubiaceae are herbs and vines with opposite or whorled leaves, inferior ovaries of 2 carpels, and flowers parts (sepals, petals, and stamens) usually 4 in number. Interpetiolor stipules can be large and leaf-like (or small). World wide diversity includes shrubs, trees, and woody vines, and flower parts can be in 4’s or 5’s.
Galium aparine
Galium; these flowers are about 3/16 inch across
Galium sp.
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Galium aristatum
Galium aristatum
Galium aristatum
Galium aristatum
Houstonia caerulea
Houstonia caerulea
Houstonia caerulea
Houstonia purpurea
Houstonia purpurea
Houstonia purpurea
Rubia tinctoria - most Rubiaceae in western US have 4-merous flowers, but world wide diversity can have 5-merous flowers. This species was introduced from Europe
Rubia tinctoria - some of the sprawling members of this family have barbs that aid the plants as they clamor over other plants
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