Cornus unalaschkensis |
Cornus kousa |
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alaskan bunchberry, western bunchberry, western cordilleran bunchberry |
Japanese dogwood, kousa, kousa dogwood |
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Habit | Trees to 10 m, flowering at 2 m. | |
Stems | erect, green, 6–22 cm, appressed-hairy; nodes 4–6, internodes progressively longer distally; branches only at distalmost node, much shorter than distal internodes so stems appear unbranched. |
solitary or clustered, bark mottled gray and tan, of thin exfoliating plates; branches gray-maroon with longitudinal fissures, bark flaky; branchlets gray, densely appressed-hairy; lenticels pale, round or lenticular spots. |
Leaves | at proximal 2–4 nodes nonchlorophyllous, opposite, ± scalelike, caducous (rarely chlorophyllous at 3d node from apex but much smaller than more distal leaves), at 2d node from apex nonchlorophyllous proximally, chlorophyllous distally, opposite, well developed, persistent, at distalmost node chlorophyllous, appearing to be in whorl of 6, well developed, persistent; distalmost leaves much bigger than those at 2 more proximal nodes; petiole 0–3.4 mm; blade ovate to elliptic, 3.5–8 × 0.9–4 cm, apex acute or short acuminate, abaxial surface pale green, hairs sparsely appressed-hairy, adaxial surface green, appressed-hairy; secondary veins 3 per side, all arising from proximal 1/2. |
petiole 5–12 mm; blade elliptic, ovate, or widely ovate, 5–8 × 2–5 cm, base cuneate, apex long acuminate, abaxial surface pale green, appressed-hairy, tufts of erect hairs in axils of secondary veins, adaxial surface dark green, appressed-hairy; secondary veins 4–6 per side, evenly spaced, vein also present on leaf margin. |
Inflorescences | 20–40-flowered; peduncle 13–30 mm; primary branches 0–2 mm; bracts greenish white or white, often red-tipped, unequal, 2 ovate, 21–30 × 12–13 mm, 2 suborbiculate, 17–1.9 × 13–16 mm, apex acuminate. |
subglobose, 0.9–1.4 cm diam., 40–75-flowered; peduncle 40–60 mm; petaloid bracts white to slightly yellow, narrowly ovate, rhombic, or trullate, 4–7 × 3–6 cm, base cuneate, apex acuminate. |
Pedicels | 0.4–1.6 mm, sparsely appressed-hairy or glabrous. |
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Flowers | hypanthium cream to mottled purple, 1.2–2 mm, densely appressed-hairy; sepals mottled purple and cream, 0.1–0.4 mm, apex rounded or acute, thick, sparsely hairy on margin, densely glandular; petals cream proximally, purple distally, 1.5–1.8 mm, apical awn 0.4–0.6 mm; nectary dark purple or black. |
hypanthium appressed-hairy; sepals 1–1.5 mm; petals cream or yellow-green, 3–4 mm. |
Drupes | 10–20 per inflorescence, red, globose, 6–8 mm; stone globose or subglobose, 2.7–3.4 × 2.1–3.4 mm, longitudinally grooved, apex slightly pointed. |
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Syncarps | red, subglobose, 20–27 mm diam.; stones ellipsoid, 7–9 × 4–5 mm, smooth. |
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2n | = 44. |
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Cornus unalaschkensis |
Cornus kousa |
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Phenology | Flowering May–Aug; fruiting Aug–Oct. | Flowering Apr–Jul; fruiting Aug–Oct. |
Habitat | Maritime copse or heath, maritime coniferous forests and bog woodlands, moist broadleaf or coniferous forests. | Disturbed areas, lawns. |
Elevation | 0–3000 m. [0–9800 ft.] | 0–1000 m. [0–3300 ft.] |
Distribution |
AK; CA; ID; OR; WA; AB; BC; YT
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NC; NY; Asia (China, Japan, Korea) [Introduced in North America]
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Discussion | Cornus kousa is frequently planted in the flora area as an ornamental and for its edible fruit. Though not well established, it has been noted to spread from cultivation. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 12, p. 448. | FNA vol. 12, p. 445. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Arctocrania unalaschkensis, Chamaepericlymenum unalaschkense, Cornella unalaschkensis, Swida unalaschkensis | Benthamia japonica, Benthamidia japonica, Dendrobenthamia japonica |
Name authority | Ledebour: Fl. Ross. 2: 378. (1844) | Bürger ex Hance: J. Linn. Soc., Bot. 13: 105. (1872) |
Web links |