Genus: Oenothera - Ornamental Plant Information from PlantsGalore.Com

Sundrops

North America

Oenothera acaulis	Dandelion Sundrops biennial
O. biennis	Common Evening Primrose
O. caespitosa	Twisted Sundrops
O. fruticosa	Common Sundrops
O. missoursensis	Ozark Sundrops
O. odorata
O. perennis
O. pilosulla
O. rosen	Rose Sundrops
O. speciosa	Showy Evening Primrose
O. tetragona	Common Sundrops
O. youngii	Young's Sundrops

Species	Hgt (in)	Flower Color	Flower Nocturnal
O. caespitosa	4-8	white, pink	Yes
O. fruticosa	18-24	yellow	No
O. missoursensis	6-12	yellow	No
O. odorata	18-24	yellow	Yes
O. perennis	12-24	yellow	No
O. speciosa	12-24	white, pink	No
O. tetragona	12-36	yellow	No

* Guides and Keys are from the book "Herbaceous Perennial Plants A Treatise on their Identification, Culture and Garden Attributes" by Dr Allan M. Armitage of the University of Georgia. Varsity Press, Athens, Georgia. 1989 ISBN 0-942375-00. More on Dr Armitage and his other books.