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Taxon  Report  
Hesperolinon sharsmithiae  R. O'Donnell
Sharsmith's western flax
Hesperolinon sharsmithiae is an annual herb that is native to California.
California Rare Plant Rank: 1B.2 (rare, threatened, or endangered in CA and elsewhere).
Siskiyou Del Norte Modoc Humboldt Shasta Lassen Trinity Plumas Tehama Butte Mendocino Glenn Sierra Yuba Lake Nevada Colusa Placer Sutter El Dorado Yolo Alpine Napa Sonoma Sacramento Mono Amador Solano Calaveras Tuolumne San Joaquin Marin Contra Costa Alameda Santa Cruz Mariposa Madera San Francisco San Mateo Merced Fresno Stanislaus Santa Clara Inyo San Benito Tulare Kings Monterey San Bernardino San Luis Obispo Kern Santa Barbara Ventura Los Angeles Riverside Orange San Diego Imperial
Observation Search
~73 records in California
yellowone or more occurrences
within a 7.5-minute quadrangle

Bloom Period
Genus: Hesperolinon
Family: Linaceae  
Category: angiosperm  
PLANTS group:Dicot
Jepson eFlora section: eudicot

Ultramafic affinity: 5.7 - strict endemic
Name Status:
Accepted by CNPS

Information about  Hesperolinon sharsmithiae from other sources
Nursery availability from CNPLX
Commercial availability unknown.

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[explorer.natureserve.org] Rarity: Hesperolinon sharsmithiae occurs in the western United States where it is endemic to serpentine soils of Lake and Napa counties. There are 35 known occurrences, of which a third are on private lands where they are threatened by development and expansion of vineyards. Surveys are needed to determine how occurrences with the threat of land conversion are doing. Some occurrences are on BLM land and State Park lands. (contributed by Mary Ann Machi)

[wildflower.org] Description: Plant Characteristics Duration: Annual Habit: Herb Leaf Arrangement: Alternate Leaf Shape: Linear Leaf Margin: Entire Inflorescence: Axillary , Cyme Fruit Type: Capsule Size Notes: To about 20 inches in height. Leaf: "Leaves alternate; stipular glands present only at proximal nodes; blade linear, 15 to 20 by 1 to1.5 mm, base flat, not clasping, margins without stalked glands." (Webref: 3). Flower: "Inflorescences: cymes dichasial, open, internodes long, flowers scattered; bract margins sparsely glandular. Pedicels 0.5 to 2 mm near tips of branches, 4 to 5 mm in fruit, ascending, not bent at apex. Flowers: sepals erect, not reflexed at tip, oblanceolate, (1.5-)3 mm, equal, margins sparsely glandular, surfaces glabrous; petals widely spreading, yellow, veins sometimes red-streaked, oblanceolate to obovate, or almost oval, 3 to 4.5 mm, apex erose; cup yellow, rim lobed between filaments and petal attachments; stamens exserted; filaments 1.5 to 2.5 mm; anthers yellow, dehisced anthers 1 to 1.5 mm; ovary chambers 6; styles 3, color not known, 2 to 3.5 mm, exserted." (Webref: 3). Fruit: "Fruit globose capsule about 2 mm long and as wide." (Reslit: 3182). Bloom Information Bloom Color: Yellow Bloom Time: May , Jun , Jul (contributed by Mary Ann Machi)

Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals. [web application]. 2024. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 05/28/2024).