Biology 130
Oenothera spp.; evening-primrose
[Onagraceae]
A dozen species of annual, biennial, or
perennial herbs. Most
species are tall (to 6’), with showy yellow flowers (1½-2") borne in the
axils of leaf like bracts.
Flowers with elongated calyx tube, 4 flaring yellow petals, and a
prominent cross-shaped stigma.
Evening primrose flowers open at twilight, sundrops (same genus)
open at mid day. Common on
road edges and dry waste places.
Flowers, then produces distinctive rod-shaped fruits throughout
the summer.
[090]
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