Corylopsis

Corylopsis is a genus of nearly 30 species of shrubs in the witch hazel family, Hamamelidaceae, native to eastern Asia with the majority of species endemic to China but with some also in Japan, Korea, and the Himalayas. This genus is also known from the extinct species Corylopsis reedae described from Eocene leaf fossils found in Washington State, USA.

Corylopsis
Corylopsis spicata in flower
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Order:	Saxifragales
Family:	Hamamelidaceae
Subfamily:	Hamameloideae
Tribe:	Corylopsideae Harms
Genus:	Corylopsis Siebold & Zucc.

They grow to 2–6 m (6 ft 7 in – 19 ft 8 in) tall, often with a crown wider than the shrub's height. The leaves are ovate with an acute apex and a serrated margin, 4–20 cm (2–8 in) long and 3–15 cm (1.2–5.9 in) broad. The flowers are produced in late winter in pendulous racemes 3–9 cm (1.2–3.5 in) long with 5-30 flowers; each flower has five pale yellow petals, 4–9 mm long. The fruit is a dry capsule 10–12 mm long, containing two glossy black seeds.

Selected species

Native to China unless otherwise indicated

Corylopsis alnifolia Corylopsis brevistyla Corylopsis glabrescens (Japan, Korea) Corylopsis glandulifera Corylopsis glaucescens Corylopsis griffithii (Himalaya) Corylopsis henryi Corylopsis himalayana (Himalaya) Corylopsis microcarpa Corylopsis multiflora Corylopsis obovata Corylopsis omeiensis

Corylopsis pauciflora (Japan, Taiwan) Corylopsis platypetala †Corylopsis reedae (extinct, Ypresian, Washington State) Corylopsis rotundifolia Corylopsis sinensis Corylopsis spicata (Japan) Corylopsis stelligera Corylopsis trabeculosa Corylopsis veitchiana Corylopsis velutina Corylopsis willmottiae Corylopsis yui Corylopsis yunnanensis

• 
  Corylopsis himalayana, National Botanic Gardens (Ireland)
• 
  Corylopsis multiflora
• 
  Corylopsis pauciflora

Cultivation and uses

They are often grown in gardens for their very early, yellow flowers. They do have weak branches though, which are often damaged by heavy snow loads. Corylopsis prefers to grow in semi-shade or shade, protected from strong winds. It grows best on humus-rich soils. The sweetly scented flowering branches keep well in a vase. Corylopsis also makes good bonsai plants, especially C. pauciflora.

References

• Radtke,Meghan G., Pigg, Kathleen B., & Wehr, Wesley C. (2005); "Fossil Corylopsis and Fothergilla leaves (Hamamelidaceae) from the Lower Eocene flora of Republic, Washington, U.S.A., and their evolutionary and biogeographic significance" International Journal of Plant Sciences 166(2):347–356
• Flora of China: Corylopsis