Fremontodendron californicum

Fremontodendron californicum is one of three species in the genus Fremontodendron, the others being Fremontodendron mexicanum and Fremontodendron decumbens.[5][6]

Fremontodendron decumbens — Pine Hill flannelbush.

Subspecies have formerly included:

• Fremontodendron californicum ssp. decumbens [7] — Pine Hill flannelbush: reclassified as Fremontodendron decumbens (R. Lloyd).[8][9][10]

A decumbent and low spreading form, 3 feet (0.91 m) in height and 6 feet (1.8 m) in width, has yellow-orange flowers, and is endemic to the Sierra Nevada foothills, nearly all of the individuals of this subspecies are found in the Pine Hill Ecological Reserve in El Dorado County. In nature it only grows in metal-rich gabbro soil, a red weathered soil of volcanic origin. It requires fire for seed germination, but as the nature reserve is near human settlements fire ecology is suppressed. It is a federally listed endangered species.

Fremontodendron californicum (ssp. napensis) — Napa Fremontia.

• Fremontodendron californicum ssp. californicum — California fremontia: now reclassified as the species, Fremontodendron californicum.[11]
• Fremontodendron californicum ssp. napensis — Napa Fremontia: The current Jepson does not recognize this subspecies, using Fremontodendron californicum, but the form is different enough that it is horticulturally recognized by this name. It is typically smaller and more open in form than the species, with much smaller leaves and flowers. It grows 6–15 feet (1.8–4.6 m) in height and 4–12 feet (1.2–3.7 m) in width.[12]

As a traditional Native American medicinal plant, the inner bark's sap that was used as a topical remedy for mucous membrane irritation and for gastrointestinal upset, by some of the indigenous peoples of California.[13] The wood was also used by the Californian Yokut and Kawaiisu peoples as a building and furniture material, and the bark for cordage and for nets used in acorn cache holding and snare hunting.[13]

Fremontodendron californicum is cultivated as an ornamental plant by specialty plant nurseries, for planting in native plant, drought tolerant, and wildlife gardens, and in natural landscaping and habitat restoration projects.[14][15]

Cultivated plants need good drainage, and no supplemental summer water when established. Fremontodendron californicum ssp. decumbens is the most garden tolerant of all Fremontia, and can also be used in large pots and planters.[16]

Fremontodendron 'Ken Taylor' (F. californicum X Fremontodendron mexicanum).

There are several named hybrids of Fremontodendron californicum and F. mexicanum in the horticultural trade, they include:

• Fremontodendron 'California Glory' — lemon-yellow flowers with a reddish tinge, grows 20 feet (6.1 m) in height by 20 feet (6.1 m) in width. It is the winner of the Award of Garden Merit from the California Horticultural Society in 1965, and received a First Class Certificate from the Royal Horticultural Society in 1967.[17]
• Fremontodendron 'Ken Taylor' — golden flowers with a darker orange outside petals in the spring and summer, and grows to only 5 feet (1.5 m) in height by 8–10 feet (2.4–3.0 m) in width.[18]
• Fremontodendron 'Dara's Gold' — golden flowers over a long period from late winter through early summer, grows 3 feet (0.91 m) in height by 6–8 feet (1.8–2.4 m) in width. A hybrid between Fremontodendron decumbens and Fremontodendron mexicanum.[19]
• Fremontodendron 'San Gabriel' — 10–18 feet (3.0–5.5 m) in height by 8–12 feet (2.4–3.7 m) in width, suitable for an espalier.[20]