''Thysanocarpus radians'' is a species of flowering plant in the family Brassicaceae known by the common name ribbed fringepod. The plant is also colloquially known as spokepod because of its seedpods’ characteristic resemblance to tire spokes. It is native to northern and central California and Oregon, where it grows in moist meadows, fields, hillsides, and other habitat. It is an annual herb growing up to 50 or 60 centimeters tall. The leaves are wavy-edged or lobed, the basal ones up to 5 centimeters long and ephemeral, and the upper ones with bases clasping the stem. The inflorescence is a long, open

raceme A raceme ( or ) or racemoid is an unbranched, indeterminate type of inflorescence bearing flowers having short floral stalks along the shoots that bear the flowers. The oldest flowers grow close to the base and new flowers are produced as the s ...

of small whitish or purplish flowers. The fruit is a flattened, rounded, disclike capsule which hangs from its pedicel. It measures up to a centimeter long and is hairless to quite hairy in texture. The flat wing lining the edge of the disc is ribbed with rays like the

spoke A spoke is one of some number of rods radiating from the center of a wheel (the hub where the axle connects), connecting the hub with the round traction surface. The term originally referred to portions of a log that had been riven (split l ...

s of a wheel, a characteristic making it easily distinguished from other ''Thysanocarpus'' when it is in fruit.

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Jepson Manual TreatmentFlora of North AmericaPhoto gallery
Brassicaceae Flora of Oregon Flora of California Flora without expected TNC conservation status {{Brassicales-stub