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Juncus triformis
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Yosemite Dwarf Rush
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Juncus triformis

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About Yosemite Dwarf Rush (Juncus triformis) Juncus triformis is an uncommon species of rush known by the common names Yosemite dwarf rush and long-styled dwarf rush. It is endemic to California, where it grows in wet granite rock habitat covered in thin soil layers, such as vernal pools and seeps. It is known from the Sierra Nevada, Central Valley, and some locations in southern California. This is a small annual herb forming dense clumps of hair-thin red stems up to about 16 centimeters high. The flower cluster is made up of one to eight tiny flowers atop each stem. The flowers have a few greenish to bright red segments no more than 4 or 5 millimeters long.
Plant Description
Plant Type

Max. Height
6.2 in (15.7 cm)

Flower Color

Native Status

Natural Setting
Site Type
Vernal pools, granitic seeps

Part Shade

Elevation ?
475' - 9910'

Annual Precip. ?
11.6" - 73.0"

Summer Precip. ?
0.27" - 2.71"

Coldest Month ?
23.6° F - 52.9° F

Hottest Month ?
46.6° F - 80.0° F

Humidity ?
1.21 vpd - 27.03 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Long-styled Dwarf Rush

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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