Alyssum alyssoides is a species of flowering plant in the mustard family

Brassicaceae

Brassicaceae, a medium sized and economically important family of flowering plants , are informally known as the mustards, mustard flowers, the crucifers or the cabbage family....

 known by several common names, including pale madwort and yellow alyssum. It is native to Eurasia, but it can be found throughout much of the temperate world as an introduced species

Introduced species

An introduced species — or neozoon, alien, exotic, non-indigenous, or non-native species, or simply an introduction, is a species living outside its indigenous or native distributional range, and has arrived in an ecosystem or plant community by human activity, either deliberate or accidental...

 and sometimes a common weed.

Description

This is a hairy annual or biennial herb producing stems which grow upright or lie along the ground to a maximum length of 30 to 40 centimeters. It produces white or cream-colored flowers with small petals a few millimeters long. The fruit is a hairy capsule up to half a centimeter long containing seeds which are winged and have an embryonic root already present.

External links

• Jepson Manual Treatment
• USDA Plants Profile
• GRIN Species Profile