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