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Tiburon Mariposa Lily Back to Plant Page
Calochortus tiburonensis

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About Tiburon Mariposa Lily (Calochortus tiburonensis) Calochortus tiburonensis (also known as the Tiburon Mariposa Lily) is a rare member of the genus Calochortus in the family Liliaceae. It was first brought to the attention of science in 1971, and written up in the botanical literature in 1973. Calochortus tiburonensis is endemic to a single serpentine outcrop in California's Marin County. It grows on serpentine-derived soil atop this outcrop in grasslands from 0-200 meter. on Ring Mountain. It is considered threatened due to loss of surrounding habitat to recreational activities, to competition from invasive species, to its proximity to a dense population center, and to its confinement to a single population of plants. The population grows on land owned by the Marin County Open Space District. Calochortus tiburonensis is a perennial growing from a bulb to 10-60 centimeter in height with a single leaf. It produces anywhere from 2 to 7 erect flowers annually on a branching stem. The ciliate, light yellow-green petals are streaked with purplish-brown. When mature, ovaries form capsules full of small, dark brown seeds.
Plant Description
Plant Type
Perennial herb

Max. Height
0.33 - 2 ft (0.1 - 0.6 m)

Flower Color
Cream, Brown, Purple, Yellow, Green

Native Status
Natural Setting
Site Type
grassy places


Elevation ?
356' - 531'

Annual Precip. ?
30.1" - 31.5"

Summer Precip. ?
0.27" - 0.28"

Coldest Month ?
49.1° F - 49.5° F

Hottest Month ?
64.5° F - 65.6° F

Humidity ?
1.35 vpd - 10.63 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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