Heuchera maxima

Herbs caulescent; caudex branched. Flowering-stems 9–30 cm, short or long-stipitate-glandular, viscid. Leaves: petiole (7–22 cm), densely long-stipitate-glandular; blade pentagonal to septagonal, deeply 5-lobed, 6.3–17 cm, base deeply cordate, lobes rounded, margins crenate, apex obtuse, surfaces long-stipitate-glandular abaxially, glabrous adaxially except long-stipitate-glandular near margins, viscid. Inflorescences dense. Flowers: hypanthium radially symmetric, free 0.3–1.4 mm, white to pink, hemispheric, 2.5–4.2 mm, densely long-stipitate-glandular; sepals somewhat spreading, green or red-tipped, equal, 0.7–2 mm, apex rounded or truncate, (medium to long-stipitate-glandular); petals spreading, white, oblong-lanceolate, (clawed), unlobed, 2–4 mm, margins entire; stamens exserted 0.4–2.5 mm; styles exserted to 2 mm, 1.5–4 mm, 0.1+ mm diam. Capsules ovoid, 4–8 mm, beaks divergent, not papillose. Seeds black, broadly fusiform, 0.4 mm. 2n = 14.

Phenology: Flowering Mar–May.
Habitat: Exposed cliffs
Elevation: 0-500 m

Calif.

Discussion

Of conservation concern.

Heuchera maxima is found on the northern Channel Islands (Anacapa, Santa Cruz, Santa Rosa), Santa Barbara County.

Heuchera maxima is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Selected References

None.

Lower Taxa