Streptanthus flavescens

Streptanthus flavescens, synonyms including Guillenia flavescens, is a species of mustard plant in the family Brassicaceae. It is one of several species known by the common name yellow mustard, though the plant most widely known as yellow mustard is probably Sinapis alba. S. flavescens is a thin-stemmed annual herb growing large, lobed or toothed leaves up to 22 centimeters long around its base, and smaller, less toothed leaves along its gray-pink to brown stem. At intervals along the upper stem appear cream, yellowish, or very pale purple flowers, each somewhat cuboid in shape and about a centimeter long. The tips of the petals around the mouth are curled, flared, or claw-like. The fruit is a thin silique up to 9 centimeters long. This species is endemic to California, where it grows in the valleys and mountains surrounding the San Francisco Bay Area.

Streptanthus flavescens
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Brassicales
Family:	Brassicaceae
Genus:	Streptanthus
Species:	S. flavescens
Binomial name
Streptanthus flavescens Hook.
Synonyms
List Caulanthus flavescens (Hook.) Payson Caulanthus procerus (W.H.Brewer ex A.Gray) S.Watson Erysimum flavescens (Hook.) Kuntze Guillenia flavescens (Hook.) Greene Guillenia hookeri (Hook.) Greene Streptanthus dudleyi Eastw. Streptanthus flavescens (S.Watson) Torr., nom. illeg. Streptanthus lilacinus Hoover Streptanthus procerus W.H.Brewer ex A.Gray Thelypodium flavescens (Hook.) Jeps., nom. illeg. Thelypodium flavescens S.Watson Thelypodium greenei Jeps. Thelypodium hookeri Greene Thelypodium procerum (W.H.Brewer ex A.Gray) Greene

External links

• Jepson Manual Treatment
• USDA Plants Profile
• Photo gallery