SafePlants

Hesperolinon congestum and Hesperolinon californicum: Exploring the Dwarf Flaxes of California

This page delves into the world of dwarf flaxes, focusing primarily on Hesperolinon congestum (Marin Dwarf Flax) and Hesperolinon californicum (California Dwarf Flax), two closely related species endemic to California.

Considerations for Pets

• The text mentions "flax" frequently in relation to both native California species and non-native Phormium varieties. While toxicity isn't explicitly stated, it is advisable to monitor pets around these plants and prevent ingestion, especially if they have a history of dietary indiscretion.

Considerations for Children

• As with pets, it's wise to supervise children around these plants. Although toxicity isn't mentioned, discouraging them from eating any part of the plant is a sensible precaution.

Nomenclature and Taxonomy

• Scientific Name: Hesperolinon congestum, Hesperolinon californicum
• Common Names: Marin Dwarf Flax, California Dwarf Flax, Glandular Dwarf Flax
• Family: Linaceae (Flax Family)

Distribution and Habitat

• Hesperolinon congestum (Marin Dwarf Flax) is found exclusively in San Mateo, San Francisco, and Marin Counties, California, USA.
• Hesperolinon californicum (California Dwarf Flax) is endemic to California.
• They typically inhabit serpentine bluffs, grasslands, and openings in serpentine scrub.

Ecological Role and Conservation Status

• Hesperolinon congestum is listed as endangered by the U.S. Endangered Species List and classified as threatened in California.
• They are often found in sensitive habitats, and their presence can be affected by foot traffic and competition from other species.
• The text mentions the impacts to protected Marin dwarf flax and endangered California red-legged frog.

Morphological Characteristics

• Both species are annual herbs.
• They are noted as being "tiny and under-appreciated".

Interactions with Other Organisms

• The text mentions that some populations of Hesperolinon californicum are subject to attack by unspecified organisms.

Synonyms and Related Species

• Hesperolinon adenophyllum (glandular dwarf-flax)
• Hesperolinon breweri (Brewer's Dwarf-flax)
• Hesperolinon tehamense (Paskenta Grade dwarf flax)
• Hesperolinon micranthum

Further Information

• California Natural Diversity Database
• Consortium of California Herbaria
• UCJEPS TAPIR
• Discover Life
• The Jepson Manual of Higher Plants of California
• Encyclopedia.com