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Oenothera jamesii Torr. & A.Gray

Trumpet evening primrose (en)

Species

Angiosperms > Myrtales > Onagraceae > Oenothera

Characteristics

Robust erect densely appressed-pubescent biennial to 2 m tall; leaves elliptic to broadly lanceolate, appressed-pubescent; rosette leaves narrower near the base, sinuate-pinnatifid to denticulate, 6-20 cm long and 2-4 cm wide their petioles 2-6 cm long; cauline leaves denticulate, 5-12 cm long and 2-3.5 cm wide, short-petioled below to subsessile above; flowers opening near sunset; mature buds erect-hypanthium 6-11 cm long; sepals 4-6 cm long, with free tips 3-6 mm long; petals yellow, fading reddish, 3.5-5 cm long; capsule thick, cylindric, 2-5 cm long; seeds in 2 rows in each locule, 1.5-2 mm long.
More
Stout, erect, winter annuals or biennials, 0.15-2.15 m high; forming rosettes; stems strigillose. Leaves: rosette leaves 60-200 mm long; cauline leaves broadly lanceolate, sinuate-serrulate, base cuneate, apex acuminate. Floral tube up to 130 mm long. Sepals with free tips 3-6 mm long. Petals up to 50 mm long. Fruit a capsule up to 50 x 10 mm. Seeds sharply angled, 1.5-2.0 mm long.
Annual or biennial herb, up to 1.5 m high. Stems and fruit adpressed pubescent. Cauline leaves 20-35 mm broad, sharply sinuate-serrulate. Sepals and petals 20-60 mm long. Capsule cylindrical. Flowers up to 100 mm in diameter; bright yellow fading pinkish.
Pending.
Life form biennial
Growth form herb
Growth support free-standing
Foliage retention deciduous
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 1.5 - 2.0
Root system -
Rooting depth (meter) -
Root diameter (meter) -
Flower color
Blooming months -
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway -

Environment

Recorded from disturbed roadside verges and at the edge of a watercourse.
Light -
Soil humidity 6-8
Soil texture -
Soil acidity -
Soil nutriment -
Hardiness (USDA) 6-11

Usage

Uses -
Edible -
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Mode -
Germination duration (days) 15 - 30
Germination temperacture (C°) 18 - 21
Germination luminosity light
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Distribution

Oenothera jamesii world distribution map, present in Australia, Spain, Japan, Mexico, United States of America, and South Africa

Identifiers

LSID urn:lsid:ipni.org:names:294782-2
WFO ID wfo-0001087536
COL ID 48XXR
BDTFX ID 168411
INPN ID -
Wikipedia (EN)
Wikipedia (FR)

Synonyms

Oenothera jamesii Onagra jamesii
WorldFloraDB 2024