Chiba University Matsudo/Kashiwa Campus Plant Database

Details of genus: Oenothera L. [749]

genus_ja:

genus_en: Evening primrose, Sundrops

# spp.:

pub_year:

accepted: Accepted

Family: Onagraceae

family_ja: アカバナ

Infra familial classification:

distribution_en:

description_en: Genus of about 125 species of annuals, biennials, and perennials, some with tap roots or fibrous roots and a few with rhizomes or runners. Mostly from North America, with a few from South America, they grow in well-drained, sunny sites, such as mountain slopes, although some are from deserts. They have upright or decumbent stems with alternate, more or less lance-shaped, simple or pinnatifid, entire or toothed stem leaves, and occasionally basal rosettes of slightly larger leaves. Evening primroses are grown for their flowers, which are mainly produced over long periods in summer; they are often fragrant, white, yellow, or pink and are large, saucer- to cup-shaped, sometimes trumpet-shaped. Each flower has a long tube and 4 petals, and is either solitary and axillary, or borne in terminal racemes. Individual flowers open at dawn or dusk and fade quickly. Taller species are suitable for a sunny, mixed or herbaceous border; low-growing ones are better for border edging. O. acaulis, O. caespitosa, and O. macrocarpa are excellent for a scree bed or rock garden.

hardiness_en: Fully hardy to frost hardy.

cultivation_en:

propagation_en: Sow seed in containers in a cold frame: annuals and perennials in early spring, biennials in early summer; or sow annuals and biennials in situ in autumn. O. glazioviana self-seeds prolifically. Divide in early spring, or take softwood cuttings of unflowered shoots of perennials from late spring to midsummer. To avoid damage to tap-rooted species, grow on seedlings and cuttings individually in pots before planting out.

pests_en: Prone to slugs, and sometimes affected by leaf spot and mildew. Root rot may be a problem in wet, heavy soil.

description_ja:

comment: America

comment_ja: マツヨイグサ，ツキミソウ

type_species:

Phylogenetic definition:

Update Information: Created: 2007-12-06 12:51; Updated: 2020-09-04 03:56

family: