Draba sierrae
Encyclopedia
Draba sierrae is an uncommon 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 the common name Sierra draba. It is endemic to the central Sierra Nevada of California
California
California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

, where it is known from just a few occurrences in rocky alpine
Alpine climate
Alpine climate is the average weather for a region above the tree line. This climate is also referred to as mountain climate or highland climate....

 habitat. It is a perennial herb forming small, dense cushions of very hairy, oblong or lance-shaped grayish leaves each under centimeter long. The erect inflorescence
Inflorescence
An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Strictly, it is the part of the shoot of seed plants where flowers are formed and which is accordingly modified...

 bears several yellow flowers. The fruit is a flat, twisted, oval-shaped silique
Silique
A silique or siliqua is a fruit of 2 fused carpels with the length being more than three times the width. The outer walls of the ovary usually separate when ripe, leaving a persistent partition...

under a centimeter long containing a few unwinged seeds.

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