Streptanthus gracilis
Encyclopedia
Streptanthus gracilis is an uncommon species of flowering plant in the mustard family
known by the common name alpine jewelflower.
, where it is known only from the Kings-Kern Divide in the Sierra Nevada, a series of high mountain peaks near the intersection of Tulare
, Fresno
, and Inyo Counties
. It grows in weathered rocky habitat such as talus
.
. Leaves higher on the stem have shorter blades which may have short petioles or may clasp the stem at their bases.
Flowers occur at intervals along the upper stem. Each has an urn-shaped calyx of pink sepal
s about half a centimeter long with pink petals emerging from the tip. The fruit is a thin, straight or curving silique
up to 7 centimeters long.
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 alpine jewelflower.
Distribution
It is endemic to CaliforniaCalifornia
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 only from the Kings-Kern Divide in the Sierra Nevada, a series of high mountain peaks near the intersection of Tulare
Tulare County, California
Tulare County is a county located in the Central Valley of the U.S. state of California, south of Fresno. Sequoia National Park is located in the county, as are part of Kings Canyon National Park, in its northeast corner , and part of Mount Whitney, on its eastern border...
, Fresno
Fresno County, California
Fresno County is a county located in the Central Valley of the U.S. state of California, south of Stockton and north of Bakersfield. As of the 2010 census, it is the tenth most populous county in California with a population of 930,450, and the sixth largest in size with an area of . The county...
, and Inyo Counties
Inyo County, California
-National protected areas:* Death Valley National Park * Inyo National Forest * Manzanar National Historic Site-Major highways:* U.S. Route 6* U.S. Route 395* State Route 127* State Route 136* State Route 168* State Route 178...
. It grows in weathered rocky habitat such as talus
Scree
Scree, also called talus, is a term given to an accumulation of broken rock fragments at the base of crags, mountain cliffs, or valley shoulders. Landforms associated with these materials are sometimes called scree slopes or talus piles...
.
Description
Streptanthus gracilis is an annual herb producing a slender, hairless, waxy stem up to 30 or 35 centimeters tall. The basal leaves have toothed oblong blades borne on petiolesPetiole (botany)
In botany, the petiole is the stalk attaching the leaf blade to the stem. The petiole usually has the same internal structure as the stem. Outgrowths appearing on each side of the petiole are called stipules. Leaves lacking a petiole are called sessile, or clasping when they partly surround the...
. Leaves higher on the stem have shorter blades which may have short petioles or may clasp the stem at their bases.
Flowers occur at intervals along the upper stem. Each has an urn-shaped calyx of pink sepal
Sepal
A sepal is a part of the flower of angiosperms . Collectively the sepals form the calyx, which is the outermost whorl of parts that form a flower. Usually green, sepals have the typical function of protecting the petals when the flower is in bud...
s about half a centimeter long with pink petals emerging from the tip. The fruit is a thin, straight or curving 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...
up to 7 centimeters long.