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Last Chance Rockcress
Boechera yorkii

About Last Chance Rockcress (Boechera yorkii) Boechera yorkii is a rare species of flowering plant in the mustard family known by the common name Last Chance rockcress. It is endemic to Inyo County, California, where it is known only from the Last Chance Range in Death Valley National Park. There are only two occurrences known, but the plant occurs in remote, nearly inaccessible mountain territory, so more plants may exist unobserved. The species was only described to science in 2004. Its habitat is rocky mountain canyons on cliffs of dolomite. This is a perennial herb growing from a tough, woody caudex with a basal rosette of narrow linear or lance-shaped leaves coated in branching hairs. The erect stem grows 10 to 30 centimeters tall. It is covered in a feltlike coat of hairs. The inflorescence atop the stem produces 8 to 35 flowers which grow outward and then droop. The flower has fuzzy-haired sepals and four petals each up to a centimeter long. The petals are yellow or brick red in color, or sometimes yellow with brick red tips. The fruit is a hairy silique up to four centimeters long. It is attached to the stem by a very short stalk which measures one or two millimeters long.
Plant Description
Plant Type
Perennial herb

Max. Height
4 - 11.8 in (10.2 - 30 cm)

Flower Color
Pink, Yellow, Red

Native Status
Natural Setting
Elevation ?
8024' - 8024'

Annual Precip. ?
11.5" - 11.5"

Summer Precip. ?
2.35" - 2.35"

Coldest Month ?
37.2° F - 37.2° F

Hottest Month ?
57.4° F - 57.4° F

Humidity ?
4.16 vpd - 13.75 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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