All Floras      Advanced Search
FOC Vol. 14 Page 217 Login | eFloras Home | Help
FOC | Family List | FOC Vol. 14 | Cornaceae | Cornus

22. Cornus hongkongensis Hemsley, J. Linn. Soc., Bot. 23: 345. 1888.

香港四照花 xiang gang si zhao hua

Trees or shrubs, evergreen, 3–15(–25) m tall. Bark gray, dark gray, or blackish brown, smooth; young branches green or purplish green, sparsely pubescent with brown appressed trichomes or rarely densely pubescent with brown trichomes or glabrous; old branches light gray, grayish green, or grayish brown, with lenticels or not. Winter flower buds globose to conical, exposed, subtended by four green bracts, bracts eventually expanded and petaloid; leaf buds subtending flower buds, with small triangular to lanceolate scales. Leaf blade elliptic, oblong-elliptic, or obovate-oblong, 6.2–13(–16) × 2.5–6.3(–7.5) cm, thinly to thickly leathery, abaxially light green or powder green, glabrous or sparsely pubescent with white or brown and white trichomes when young, often glabrous in age except sometimes pubescent in axils of veins, veins 3 or 4(or 5), base cuneate or broadly cuneate to rounded, apex shortly acuminate to caudate. Capitate cymes globose, 0.7–1.3(–2) cm in diam., 40–70-flowered; bracts yellowish or white, broadly elliptic, broadly ovate, or orbicular to obovate, 1.6–4 × 1.3–2(–4.2) cm, sparsely pubescent or glabrous. Calyx tube 0.7–1.3 mm, shallowly 4-lobed, rarely 5-lobed; lobes truncate to rounded. Petals elliptic, oblong-elliptic, ovate-elliptic, or ovate-lanceolate to ovate, 1.5–4.2 × 0.8–1.1 mm, sometimes slightly united at base. Style cylindrical, 0.5–1.5 mm, sparsely pubescent with white trichomes or glabrous. Compound fruit red or yellowish red at maturity, globose, 1.5–2.5 cm in diam., nearly glabrous or slightly pubescent with fine white trichomes; peduncle 4–8(–10) cm. Fl. Apr–Jun, fr. Oct–Dec.

Forests, valleys, slopes, streamsides, roadsides; 200–2500 m. Fujian, Guangdong, Guangxi, Guizhou, Hunan, Jiangxi, Sichuan, Yunnan, Zhejiang [Laos, Vietnam].

Cornus hongkongensis is highly variable in vegetative morphology and was divided into several species on the basis of minor differences, such as pubescence and the shape and size of various parts. The variation overlaps, but is also more or less associated with geographic distribution. To recognize this pattern, Xiang (Bull. Bot. Res., Harbin 7(2): 33–52. 1987) recognized six subspecies within C. hongkongensis, which we follow here. This treatment needs to be reevaluated with further data from both the field and laboratory.

1 Leaf blade obovate, 8.5–16 × 3.8–7.5 cm, thickly leathery; inflorescences (excluding bracts) 15–20 mm in diam.; bracts broadly obovate or orbicular, 4–5 × 3–4.2 cm.   22e subsp. gigantea
+ Leaf blade ovate to narrowly elliptic, 5.5–10(–13.5) × 2.7–5.8(–6.3) cm; inflorescences (excluding bracts) 7–13 mm in diam.; bracts smaller, variously shaped.   (2)
2 (1) Outer surface of petals glabrous or nearly so; style glabrous.   22b subsp. tonkinensis
+ Outer surface of petals pubescent with short appressed fine trichomes; style pubescent with white trichomes.   (3)
3 (2) Lateral leaf veins, particularly secondary lateral veins, inconspicuous.   22d subsp. elegans
+ Lateral leaf veins conspicuous, secondary lateral veins conspicuous.   (4)
4 (3) Abaxial surface of leaves and veins densely pubescent with reddish brown, coarse trichomes.   22f subsp. ferruginea
+ Abaxial surface of leaves sparsely pubescent with brown or brown and white thin trichomes; veins glabrous or nearly so.   (5)
5 (4) Leaves subleathery, axils of abaxial leaf veins often with a cluster of Y-shaped soft trichomes, abaxial surface of leaves glabrous or rarely pubescent with brown trichomes.   22c subsp. melanotricha
+ Leaves leathery or thickly leathery, axils of abaxial leaf veins without Y-shaped trichomes, abaxial surface of leaves sparsely pubescent with brown and white appressed trichomes when young, often glabrous with conspicuous brown hair scars (brown spots) in age.   22a subsp. hongkongensis

Lower Taxa


Flora of China @
Browse by
Advanced Search

Flora of China Home




 |  eFlora Home |  People Search  |  Help  |  ActKey  |  Hu Cards  |  Glossary  |