Appearance
"Erysimum insulare" is a perennial herb or subshrub producing a branching, erect stem 5 to 60 centimeters tall. It is lined with many hairy leaves which are linear to widely lance-shaped. The longest leaves near the base of the stem may be up to 15 centimeters long.The top of the stem is occupied by a raceme inflorescence of many bright yellow to yellow-orange flowers. The fruit is a silique up to 10 centimeters long.
;Subspecies
There are two subspecies of this plant:
⤷ "Erysimum insulare" subsp. "suffrutescens" — most individuals belonging in this one.
⤷ "Erysimum insulare" subsp. "insulare" — rare and limited to three of the northern Channel Islands in Channel Islands National Park.
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