Contra Costa Wallflower

Erysimum capitatum spp. angustatum
Contra Costa Wallflower Profile

Little is known about the reproductive phenology of the wallflower.  Germination may occur in October, while flowering begins in March, peaking in April or May. A variety of different insect species have been observed visiting the plant and carrying pollen away with them. Seeds are wind dispersed beginning in mid-May and peaking in September. Unlike other Brassicaceae, which are typically pollinated by specialized insects, the wallflower does not require a specific pollinator.

Although the wallflower is endangered, it has been doing fairly well on the refuge, propagating on its own. After the wallflower was planted in 1995, on dunes created in 1992 and 1993, it was self-propagating until nonnative weeds began to invade. Other than limited available habitat (wallflower seems to prefer north-facing slopes at the Refuge), nonnative weeds pose the only apparent significant threat to the wallflower.


Facts About Contra Costa Wallflower

Related to the Mustard Plant

Contra Costa Wallflower Postage Stamp

Featured on the US Postage Stamp in 1979