Chiba University Matsudo/Kashiwa Campus Plant Database

Details of genus: Hemerocallis L. [103]

genus_ja: ワスレグサ

genus_en: Day lily

# spp.: 16

pub_year: 1753

accepted: Accepted

Family: Asphodelaceae

family_ja: ツルボラン

Infra familial classification: Subfamily Hemerocallidoideae

distribution_en: SE. Alps, Siberia to Temp. E. Asia

description_en: Genus of about 13-15 species of ever-green, semi-evergreen, and herbaceous perennials from which over 30,000 named cultivars have been raised. Daylilies are found at forest margins, in mountainous areas, marshy river valleys, and meadowland in China, Korea, and Japan. They are mostly clump-forming, and occasionally rhizomatous, with arching, strap-shaped, dark green leaves, usually 75-120cm (30-48in) long, but often only 23-35cm (9-14in) long in dwarf or compact species and cultivars. Flowers, in a variety of forms (see panel right), are borne on erect, sometimes branching scapes over a long period, mainly from late spring to late summer. Many daylilies are remontant, flowering repeatedly during the season. The flowers range in colour from almost white through yellow and orange to dark purple and deepest red-black. Most flowers last for only One day; in nocturnal daylilies the flowers open in late afternoon and last throughout the night. The flowers of extended-blooming daylilies remain open for at least 16 hours. Grow daylilies in a mixed or herbaceous border; some are effective planted in drifts in a wild garden. Dwarf daylilies are ideal for a small garden or cror containers.

hardiness_en: Fully hardy except for a few evergreen daylilies that are frost hardy only, and may be weakened and killed by alternating frost and thaw.

cultivation_en:

propagation_en: Sow seed in containers in a cold frame in autumn or spring; seed from hybrids and cultivars do not come true. Divide hardy daYlilies in spring or autumn; divide all evergreen daylilies in spring.

pests_en: Susceptible to rust, hemerocallis gall midge, aphids, red spider mites, and thrips. Slugs and snails may dam-dge young leaves. Crown rot is usually a problem only in high humidity and temperatures over 32°C (90°F). In climates with alternating winter frosts and thaws, bacterial leaf and stem rot (spring sickness) may be a problem.

description_ja:

comment:

comment_ja: ワスレグサ，ヤブカンゾウ，キスゲ APG3ではXanthorrhoeaceaeだったが、Asphodelaceaeが保存名となったため、APG4でAsphodelaceaeになった。

type_species:

Phylogenetic definition:

Update Information: Created: 2007-12-06 12:51; Updated: 2023-07-07 20:33 by hkokubun@mac.com

family: