Castilleja lassenensis

Common Names

Lassen Paintbrush, Mt. Lassen Paintbrush

Summary

Lassen paintbrush is a California-endemic hemiparasitic perennial in the Orobanchaceae, restricted to subalpine meadows on volcanic substrates near Mt. Lassen. It is herbaceous, 0.8–2.1 dm tall, arising from a woody caudex, with a decumbent-based to erect growth form and sparse long soft hairs; leaves are linear-lanceolate (1–3.5 cm). Bracts proximally greenish to dull brownish purple, distally pink to magenta; calyx 11–19 mm; corolla tube 14–15 mm; beak white 7–10 mm; three shallow central pouches. Blooms June–September; elevational range 1500–2500 m; pollinated by insects and birds; hosts provide water and minerals via haustoria, influencing nutrient cycling and pollination dynamics.

Occurrence reports range roughly 22–36 known locations, reflecting a narrow Mt. Lassen distribution. California Rare Plant Rank 1B.3; Global Rank G3; State Rank S3. As a hemiparasite, it relies on hosts for water and minerals via haustoria. Threats include logging, recreational use, foot traffic, and changes to hydrologic regimes, underscoring the need for protection of its limited habitat and population monitoring.

Lifecycle

Perennial

Height

3-8 inches

Soil Type

Volcanic soils

Soil Drainage

Moderate drainage; not too wet nor too dry.

Bloom Color

Pink to magenta, occasionally white

Bloom Time

Summer

Foliage Color

Green to purple

Growth Rate

Not available

Seasons of Interest

Summer and Fall

Propagation Methods

Seed propagation with cold stratification for 4 months yields germination >90%.

Attracts Wildlife

Attracts bees, hummingbirds, butterflies, other pollinators, birds