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Abrams' alumroot, San Gabriel alum-root

Carolina alum-root

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

6–15 cm, short stipitate-glandular.

leafy, 30–105 cm, short stipitate-glandular.

Leaves

petiole glabrous or short stipitate-glandular and scattered medium stipitate-glandular;

blade ovate, deeply 5-lobed, 0.5–2 cm, base truncate or shallowly cordate, lobes rounded, margins dentate, apex obtuse, surfaces short stipitate-glandular abaxially, sparsely long stipitate-glandular adaxially.

petiole glabrous or short stipitate-glandular;

blade broadly ovate, shallowly 5-lobed, 3–10.5 cm, base cordate or nearly truncate, lobes rounded or ovate, margins dentate, apex acute or obtuse, surfaces glabrous or minutely stipitate-glandular on veins abaxially, glabrous or short stipitate-glandular adaxially.

Inflorescences

dense.

diffuse.

Flowers

hypanthium strongly bilaterally symmetric, free 1.5–2 mm on adaxial side, reddish purple, cylindric, 4–5 mm, short stipitate-glandular proximally, medium stipitate-glandular distally;

sepals spreading, green-tipped, unequal, 1.2–1.5 mm, apex obtuse or rounded;

petals spreading, white, spatulate or oblanceolate, rarely linear, unlobed, 1.5–2.5 mm (equaling or longer than sepals), margins entire;

stamens barely included to 1.5 mm exserted;

styles exserted 1.5–2 mm, 2.5–3 mm, 0.1+ mm diam.

hypanthium weakly bilaterally symmetric, free 1.3–2.5 mm, green, subglobose, abruptly inflated distal to adnation to ovary, 2.8–4.5 mm, short stipitate-glandular;

sepals erect, green-tipped, equal, 0.4–1.5 mm, apex rounded;

petals erect, white or pink, broadly spatulate, unlobed, 0.6–1 mm, margins entire;

stamens exserted 0.2–1.5 mm;

styles included from 1 mm to exserted 1.1 mm, 1–3.5 mm, to 0.1 mm diam; (stigmas from 0.5 mm included to 1.1 mm exserted).

Capsules

ovoid, 3.5–5 mm, beaks divergent, not papillose.

ovoid, 4–7 mm, beaks divergent, not papillose.

Seeds

dark brown, ellipsoid, 0.6 mm.

dark brown, ellipsoid, 0.5–0.8 mm.

2n

= 14.

Heuchera abramsii

Heuchera caroliniana

Phenology Flowering Jul–Aug. Flowering Apr–Jun.
Habitat Rocky soil in red fir forest Rich upland woods on base-saturated substrates, basic dikes and basic rock outcroppings
Elevation 2800-3100 m (9200-10200 ft) 30-300 m (100-1000 ft)
Distribution
from FNA
CA
[BONAP county map]
from FNA
NC; SC; VA
[BONAP county map]
Discussion

Heuchera abramsii occurs in the San Antonio Mountains and the eastern part of the San Gabriel Mountains, San Bernardino and Los Angeles counties. It closely resembles H. brevistaminea, H. caespitosa, H. elegans, and H. pulchella.

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

The geographic range of Heuchera caroliniana is contiguous with and appears to be a southern extension of that of H. pubescens. Heuchera americana var. americana occurs in counties adjacent to the range of H. caroliniana but they are sympatric only along the boundary; intergradation between the two is infrequent. Mixed populations of H. caroliniana and H. americana var. americana have not been seen.

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

Source FNA vol. 8, p. 99. FNA vol. 8, p. 95.
Parent taxa Saxifragaceae > Heuchera Saxifragaceae > Heuchera
Sibling taxa
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. 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
H. abramsii, H. alba, H. americana, H. bracteata, H. brevistaminea, H. caespitosa, 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. 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
Synonyms H. americana var. caroliniana
Name authority Rydberg: in N. L. Britton et al., N. Amer. Fl. 22: 109. 1905 , (Rosendahl Butters & Lakela) E. F. Wells: Rhodora 81: 575. (1979)
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