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lambkill, sheep American-laurel, sheep-laurel

sand-myrtle

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.

Inflorescences

axillary near distal end, corymbiform racemes, 4–12-flowered.

terminal, corymbiform racemes or umbels, (3–)6–8(–18)-flowered.

Pedicels

5–20 mm.

5–11 mm.

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.

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.

Seeds

winged, obovoid, 0.6–1 mm.

not winged, oblong to ovoid, 0.4–0.5 mm.

2n

= 24.

Kalmia angustifolia

Kalmia buxifolia

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
from FNA
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]
[WildflowerSearch map]
[BONAP county map]
from FNA
GA; KY; NC; NJ; NY; PA; SC; TN
[WildflowerSearch map]
[BONAP county map]
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.)

Key
1. Calyces densely stipitate-glandular; leaf blade surfaces glabrous or scattered, stipitate-glandular trichomes.
var. angustifolia
1. Calyces usually not stipitate-glandular; leaf blade surfaces densely puberulent abaxially, usually not stipitate-glandular.
var. carolina
Source FNA vol. 8, p. 482. FNA vol. 8, p. 485.
Parent taxa Ericaceae > subfam. Ericoideae > Kalmia Ericaceae > subfam. Ericoideae > Kalmia
Sibling taxa
K. buxifolia, K. cuneata, K. hirsuta, K. latifolia, K. microphylla, K. polifolia, K. procumbens
K. angustifolia, K. cuneata, K. hirsuta, K. latifolia, K. microphylla, K. polifolia, K. procumbens
Subordinate taxa
K. angustifolia var. angustifolia, K. angustifolia var. carolina
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 ,
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