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Draba streptobrachia

Draba streptobrachia (Twisted Draba)
Brassicaceae (Mustard Family)

Alpine. Scree. Summer.
Black Bear Pass, July 20, 2008.

Draba streptobrachia is a rare alpine species found only in Colorado in the mountainous counties. It enjoys the same habitat as Draba graminea and Draba crassa and it takes a careful, on the belly examination to distinguish one species from the others. All three plants are found in the thin soils of scree fields. The plant photographed above sent out a root (brown and arched in the center of the photograph) searching for soil. The root failed to find soil but leafed out and flowered anyway; all of the plant in the top half of the photograph above the brown root is free-swinging and is just balanced on rocks.

R. A. Price named this plant after some considerable controversy regarding its distinctness. It was for a time combined with Draba spectabilis. Greek gives us both "strepto" for "twisted" and "brachia" for "arms"; the name refers to the twisted arms of the hairs.

Draba streptobrachia

Draba streptobrachia (Twisted Draba)
Brassicaceae (Mustard Family)

Alpine. Scree. Summer.
Black Bear Pass, July 20, 2008.

Hairs are present on leaf, stem, seeds, and calyx.

Draba streptobrachia

Draba streptobrachia

Draba streptobrachia

Draba streptobrachia (Twisted Draba)
Brassicaceae (Mustard Family)

Alpine. Scree. Summer.
Black Bear Pass, July 20, 2008.

Range map © John Kartesz,
Floristic Synthesis of North America

State Color Key

Species present in state and native
Species present in state and exotic
Species not present in state

County Color Key

Species present and not rare
Species present and rare
Species extirpated (historic)
Species extinct
Species noxious
Species exotic and present
Native species, but adventive in state
Eradicated
Questionable presence

Range map for Draba streptobrachia