Kalmia angustifolia |
Kalmia buxifolia |
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lambkill, sheep American-laurel, sheep-laurel |
sand-myrtle |
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Habit | Shrubs erect, 0.3–1.5 m. Twigs terete, viscid, glabrous or puberulent. | Shrubs erect, 0.1–1 m. Twigs terete or slightly 2-angled proximal to node, viscid, glabrous or sparsely hairy. | ||||
Leaves | usually in whorls of 3, rarely alternate or opposite; petiole 6–16 mm, usually puberulent; blade oblong to elliptic-lanceolate, 1.5–8 × 0.5–2.5 cm, margins usually plane, apex obtuse to acute, usually apiculate, abaxial surface glabrous or puberulent, sometimes stipitate-glandular, adaxial lightly puberulent (hairs white, to 0.1 mm), sometimes glabrescent, midrib puberulent. |
alternate or opposite; petiole absent or 0.1–2 mm, glabrous or puberulent; blade ovate or oval to narrowly lanceolate, (0.4–)0.6–1.2(–1.4) × (0.2–)0.3–0.6 cm, margins somewhat revolute, apex obtuse, abaxial surface tomentulose, adaxial glabrous or sparsely puberulent toward base. |
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Inflorescences | axillary near distal end, corymbiform racemes, 4–12-flowered. |
terminal, corymbiform racemes or umbels, (3–)6–8(–18)-flowered. |
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Pedicels | 5–20 mm. |
5–11 mm. |
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Flowers | sepals usually green, sometimes reddish apically or throughout, ovate, 2–2.8 mm, apex usually acuminate, surfaces puberulent; petals connate nearly their entire lengths, usually reddish purple to pink, rarely white or bluish pink, usually deeper colored near anther pockets and with ring of red to purple spots just proximal to pockets, 7.5–9.5 × 6–13 mm, abaxial surface puberulent, adaxial glabrous, puberulent toward base; filaments 2.5–3.5 mm; style 3.5–4.5 mm. |
sepals green, lanceolate, 1–1.2 mm, apex acute, surfaces glabrous, margins ciliate; petals (spreading), distinct nearly their entire lengths, white or light pink, 3–4 × 2–3.5 mm, glabrous; filaments 3–5 mm; (ovary stipitate-glandular); style 3–4 mm. |
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Capsules | 5-locular, 2–3.5 × 3–5 mm, puberulent, stipitate-glandular. |
2–3(–5)-locular, (persistent style forming beak on each locule), 2.5–4 × 2.5–3 mm, glabrous. |
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Seeds | winged, obovoid, 0.6–1 mm. |
not winged, oblong to ovoid, 0.4–0.5 mm. |
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2n | = 24. |
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Kalmia angustifolia |
Kalmia buxifolia |
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Phenology | Flowering mid spring. | |||||
Habitat | Open pine or oak woods in sandy soil, pocosins, and rocky summits | |||||
Elevation | 0-1700(-1900) m (0-5600(-6200) ft) | |||||
Distribution |
CT; DE; GA; MA; MD; ME; MI; NC; NH; NJ; NY; PA; RI; SC; TN; VA; VT; WV; NB; NF; NS; ON; PE; QC [Introduced in n Europe]
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GA; KY; NC; NJ; NY; PA; SC; TN
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Discussion | Varieties 2 (2 in the flora). The two varieties of Kalmia angustifolia are largely separate geographically and show different flavonoid profiles (S. Liu 1993). Southeastern Virginia has long been known as a region of overlap of these two entities; field and herbarium work (B. A. Sorrie and A. S. Weakley, unpubl.) has demonstrated that the two taxa retain their distinctiveness and that hybrids are rare. Sorrie and Weakley concluded that the two should be treated as separate species. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 8, p. 482. | FNA vol. 8, p. 485. | ||||
Parent taxa | Ericaceae > subfam. Ericoideae > Kalmia | Ericaceae > subfam. Ericoideae > Kalmia | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Chamaedaphne angustifolia | Ledum buxifolium, Dendrium hugeri, Leiophyllum buxifolium, Leiophyllum buxifolium var. hugeri, Leiophyllum buxifolium var. prostratum, Leiophyllum hugeri, Leiophyllum prostratum, Leiophyllum serpyllifolium | ||||
Name authority | Linnaeus: Sp. Pl. 1: 391. 1753 , | (Bergius) Gift & Kron: Nordic J. Bot. 26: 47. 2008 , | ||||
Web links |