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alum root, crevice alum-root, small-flower alumroot

long-flower alum-root

Habit Herbs caulescent; caudex branched. Herbs acaulescent; caudex branched.
Flowering stems

6–57 cm, short to long stipitate-glandular or glabrous, viscid.

often leafy, 30–95 cm, glabrous or short stipitate-glandular.

Leaves

petiole glabrous or sparsely to densely short to long stipitate-glandular;

blade orbiculate to polygonal, shallowly to deeply 5–7(–9)-lobed, 2.5–10 cm, base cordate, lobes rounded, margins dentate, apex rounded or obtuse, surfaces glabrous or short to long stipitate-glandular, viscid.

petiole glabrous or short stipitate-glandular;

blade (often variegated adaxially), broadly ovate to cordate, shallowly 5-lobed, 3–12 cm, base cordate or nearly truncate, lobes rounded to widely ovate, terminal lobes often elongated, margins dentate, apex acute or obtuse, surfaces glabrous or short stipitate-glandular, at least on veins.

Inflorescences

diffuse.

diffuse.

Flowers

hypanthium radially symmetric, free to 1.5 mm, greenish white, often tinged with red, obconic to hemispheric, broadly turbinate, or campanulate, 1–4.9 mm, long stipitate-glandular, sometimes short stipitate-glandular proximally;

sepals spreading to nearly erect, green- or red-tipped, equal, 0.5–1.8 mm, apex rounded to acute or mucronate;

petals often coiled, white or pale pink, oblanceolate, (narrowly clawed), unlobed, 1.6–3.3 mm (2–3 times as long as sepals), margins entire;

stamens exserted to 3 mm;

styles exserted to 2.5 mm, 0.2–4.2 mm, to 0.1 mm diam.

hypanthium strongly bilaterally symmetric, free 2.2–6.2 mm, green, gibbous-tubular, abruptly inflated distal to adnation to ovary, 6.6–12.6 mm, short stipitate-glandular;

sepals inflexed (closing mouth of flower), darker green-tipped, equal, 2–3.7 mm, apex rounded;

petals inflexed (closing mouth of flower), white, pink, or purple, spatulate, unlobed, 1.8–5.5 mm, margins often fimbriate;

stamens 2.4 mm included to 0.7 mm exserted;

styles included 1.3–5.3 mm, 1.5–2.5 mm, to 0.1 mm diam.

Capsules

ovoid, 3–8.5 mm, beaks divergent, not papillose.

ovoid, 5–13 mm, beaks divergent, not papillose.

Seeds

black, broadly ellipsoid, (not curved), 0.5–0.8 mm.

dark brown, ellipsoid, 0.5–0.9 mm.

2n

= 14.

Heuchera micrantha

Heuchera longiflora

Phenology Flowering May–Jun.
Habitat Rich, shaded woods and roadcuts over limestone substrates and outcroppings
Elevation 100-500 m [300-1600 ft]
Distribution
map from FNA
CA; ID; OR; WA; BC
[WildflowerSearch map]
[BONAP county map]
map from FNA
AL; KY; NC; TN; VA; WV
[BONAP county map]
Discussion

Varieties 5 (5 in the flora).

The Skagit Indians rubbed pounded plants of Heuchera micrantha on hair to make it grow and applied it to cuts. The Thompson Indians used a mashed poultice of this root mixed with Douglas fir pitch for wounds. Chewed leaves and roots were spat on sores or wounds. Infusions of roots were taken for liver trouble and sore throat. Small, peeled, cleaned root pieces were chewed for mouth sores and gum boils (D. E. Moerman 1998).

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

Heuchera longiflora is restricted to limestone outcroppings and is rare in all the states where it is found.

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

Parent taxa Saxifragaceae > Heuchera 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. merriamii, H. novamexicana, H. parishii, H. parviflora, H. parvifolia, H. pilosissima, H. pubescens, H. pulchella, H. richardsonii, H. rubescens, H. sanguinea, H. villosa, H. wootonii
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. maxima, H. merriamii, 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
Subordinate taxa
H. micrantha var. diversifolia, H. micrantha var. erubescens, H. micrantha var. hartwegii, H. micrantha var. macropetala, H. micrantha var. micrantha
Key
1. Leaf blades orbiculate to pentagonal, shallowly lobed.
var. micrantha
1. Leaf blades pentagonal or heptagonal, deeply lobed
→ 2
2. Inflorescences short stipitate-glandular; petioles short stipitate-glandular or sparsely long stipitate-glandular
→ 3
2. Inflorescences long stipitate-glandular; petioles short to long stipitate-glandular
→ 4
3. Hypanthia hemispheric, 1 times long as wide; petals 0.4-1.4 mm wide.
var. macropetala
3. Hypanthia obconic, 1.4 times longer than wide; petals 0.2-0.6 mm wide.
var. erubescens
4. Hypanthia long stipitate-glandular, sepal apex rounded to acute.
var. hartwegii
4. Hypanthia sparsely long stipitate-glandular, sepal apex acute to mucronate
var. diversifolia
Synonyms H. aceroides, H. longiflora var. aceroides, H. scabra
Name authority Douglas ex Lindley: Edwards’s Bot. Reg. 15: plate 1302. 1830 , Rydberg: in N. L. Britton, Man. Fl. N. States, 482. (1901)
Source FNA vol. 8, p. 91. Treatment authors: Elizabeth Fortson Wells, Barbara Greene Shipes. FNA vol. 8, p. 97. Treatment authors: Elizabeth Fortson Wells, Barbara Greene Shipes.
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