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Heuchera merriamii

Canyon Creek alumroot, Merriam's alumroot

Habit Herbs acaulescent; caudex branched or unbranched.
Flowering stems

11–32 cm, long stipitate-glandular or glabrate.

Leaves

petiole (2.4–5 cm), moderately long stipitate-glandular;

blade orbiculate, reniform, or pentagonal, shallowly 5–7-lobed, 2.5–4.5 cm, base shallowly cordate to truncate, lobes rounded, margins dentate, apex rounded to obtuse, surfaces finely long stipitate-glandular abaxially, sparsely long stipitate-glandular adaxially.

Inflorescences

dense; (bracts linear and scarious to 3–5-parted and herbaceous).

Flowers

hypanthium radially symmetric, free 0.5–1.5 mm, pink, hemispheric, 3–5.5 mm, (base rounded), densely long stipitate-glandular;

sepals erect, green- or red-tipped, equal, 1–2 mm (often wider than long), apex obtuse;

petals erect, white, oblanceolate, (clawed), unlobed, 2–3.5 mm, margins entire;

stamens exserted 0.8–2 mm;

styles exserted 1–2 mm, 1.5–2.5 mm, 0.1+ mm diam.

Capsules

ovoid, 3–5 mm, beaks divergent, not papillose.

Seeds

dark brown, ellipsoid, 0.6 mm.

2n

= 14.

Heuchera merriamii

Phenology Flowering Jul–Aug.
Habitat Exposed granite ledges in subalpine forests
Elevation 1500-2500 m (4900-8200 ft)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
Discussion

Heuchera merriamii is known from the Siskiyou and Trinity mountains.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 8, p. 93.
Parent taxa Saxifragaceae > Heuchera
Sibling taxa
H. abramsii, H. alba, H. americana, H. bracteata, H. brevistaminea, H. caespitosa, H. caroliniana, H. chlorantha, H. cylindrica, H. eastwoodiae, H. elegans, H. glabra, H. glomerulata, H. grossulariifolia, H. hallii, H. hirsutissima, H. longiflora, H. maxima, H. micrantha, H. novamexicana, H. parishii, H. parviflora, H. parvifolia, H. pilosissima, H. pubescens, H. pulchella, H. richardsonii, H. rubescens, H. sanguinea, H. villosa, H. wootonii
Name authority Eastwood: Bull. Torrey Bot. Club 32: 199. 1905 (as merriami),
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