Heuchera maxima |
Heuchera alba |
|
---|---|---|
island alumroot, jill-of-the-rocks |
white alumroot |
|
Habit | Herbs caulescent; caudex branched. | Herbs acaulescent; caudex branched. |
Flowering stems | 9–30 cm, short or long stipitate-glandular, viscid. |
often leafy, 26–77 cm, short stipitate-glandular. |
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. |
petiole glabrous or short stipitate-glandular; blade broadly ovate to cordate, shallowly 5-lobed, 4.5–9 cm, base cordate or nearly truncate, lobes rounded to widely ovate, margins dentate, apex acute or obtuse, surfaces glabrous or sparsely stipitate-glandular, at least on veins. |
Inflorescences | dense. |
diffuse. |
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. |
hypanthium moderately bilaterally symmetric, free 3.5–4.5 mm, green, campanulate, abruptly inflated distal to adnation to ovary, 7.5–11 mm, short stipitate-glandular; sepals spreading, green-tipped, equal, 3–4 mm, apex rounded (sinuses narrower than petals); petals inflexed, white, broadly spatulate, unlobed, 2.8–3.5 mm, margins fimbriate; stamens 2 mm included to 2 mm exserted; styles included 0.5–1 mm, 4–6 mm, to 0.1 mm diam. |
Capsules | ovoid, 4–8 mm, beaks divergent, not papillose. |
ovoid, 9–10 mm, beaks divergent, not papillose. |
Seeds | black, broadly fusiform, 0.4 mm. |
dark brown, ellipsoid, 0.6–1 mm. |
2n | = 14. |
|
Heuchera maxima |
Heuchera alba |
|
Phenology | Flowering Mar–May. | Flowering May–Jun. |
Habitat | Exposed cliffs | Shaded or exposed sandstone rock outcroppings, ridges, and peaks |
Elevation | 0-500 m (0-1600 ft) | 1300-1500 m (4300-4900 ft) |
Distribution |
CA
|
VA; WV |
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. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. Heuchera alba occurs on sandstone ridges in the Ridge and Valley Province. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 8, p. 93. | FNA vol. 8, p. 96. |
Parent taxa | Saxifragaceae > Heuchera | Saxifragaceae > Heuchera |
Sibling taxa | ||
Name authority | Greene: Bull. Calif. Acad. Sci. 2: 149. 1886 , | Rydberg: Torreya 26: 31, plate 2. (1926) |
Web links |