Contains 20 accepted taxa overall.
Characteristics
Classification
Citation
OENOTHERA Linnaeus, Sp. Pl. 346. 1753.
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TYPE: Oenothera biennis Linnaeus Lectotypified by Rose, Contr. U.S. Natl. Herb. 8: 330. 1905.
Species
| Scientific Name | Common Name | Herbarium Specimens | Status | Photos |
|---|---|---|---|---|
| Oenothera biennis | Common Evening-primrose | |||
| Oenothera clelandii | Sand Evening-primrose | |||
| Oenothera curtiflora | Small-flowered Gaura, Velvety Gaura | |||
| Oenothera curtissii | Curtiss' evening primrose | |||
| Oenothera filipes | Threadstalk Gaura | |||
| Oenothera fruticosa var. fruticosa | Southern Sundrops | |||
| Oenothera fruticosa var. microcarpa | Small-fruited Sundrops | |||
| Oenothera gaura | Biennial Gaura, Northeastern Gaura | |||
| Oenothera glazioviana | Garden Evening-primrose | |||
| Oenothera grandiflora | Largeflower Evening Primrose | |||
| Oenothera humifusa | Seabeach Evening-primrose, Spreading Evening-primrose | |||
| Oenothera laciniata | Cutleaf Evening-primrose | |||
| Oenothera linifolia | Threadleaf Sundrops, Flaxleaf Sundrops | |||
| Oenothera nutans | Nodding Evening Primrose | |||
| Oenothera perennis | Little Sundrops | |||
| Oenothera riparia | Riverbank Evening-primrose | |||
| Oenothera simulans | Southeastern Gaura | |||
| Oenothera sinuosa | Texas Gaura | |||
| Oenothera speciosa | White Evening-primrose, Pink-ladies | |||
| Oenothera unguiculata | Southern Sundrops |
Identification Key
1. (Key A) Pedicel slender to filiform, 2-8 mm long
2
1. Pedicel stubby, 0-1 mm long
3
2. Petals 4-6 mm long
2. Petals 8-10 mm long
3. Flowers dense, overlapping along the inflorescence; sepals 2-3.5 mm long; petals 1.5-3 mm long
3. Flowers spaced, mostly not overlapping or only a few overlapping near the inflorescence tip; sepals 4-15 mm long; petals 4-20 mm long
4
4. Stem short-hirsute; sepals 12-15 mm long; petlas 12-20 mm long
4. Stem sparsely loose-uncinate; sepals 4-12 mm long; petals 4-10 mm long
1. (Key B) Leaf blades linear-filiform, <1 mm wide
1. Leaf blades >1 mm wide
2
2. Flower buds drooping; petals white to pink
2. Flower buds erect; petals yellow
3
3. Plant densely strigulose throughout, the leaf blades grayish green; of coastal habitats
4
3. Plant glabrate to strigulose or villous, usually the leaf blades and sepals green and not consistently densely strigulose; habitats various
5
4. Basal leaves 5-14 cm long, 1-2 cm wide, the cauline 0.5-2.5 cm wide; sepals 1.3-3.3 cm long; petals 2-4.5 cm long; stigma exserted beyond the anthers
4. Basal leaves 4-8 cm long, 0.7-1 cm wide, the cauline 0.3-1.5 cm wide; sepals 0.3-1.1 cm long; petals 0.5-1.6 cm long; stigma not exserted beyond the anthers
5. Plant usually 0.8-3 m tall; larger leaves (5-)8-25 cm long, 1-5 cm wide; seeds prismatic and angled
6
5. Plant usually <1 m tall; larger leaves to 10 cm long, 2 cm wide; seeds ellipsoid to subglobose or ovoid and angled
8
6. Calyx lobes 2.5-5 cm long; petals 4-6 cm long; styles 2-5 mm long, longer than the anthers
6. Calyx lobes 1-2.5 cm long; petals 1-2.5 cm long; styles 3-17 mm long, subequaling the anthers
7
7. Hypanthium and fruit villous to hirsute
7. Hypanthium and fruit glabrate
8. Flowers mostly opening around sunrise and closing around evening; fruit 4-angled, obovoid to broadly clavate
8. Flowers opening in evening and closing around morning; fruit subcylindric
9
9. Petal apex acute to rounded
9. Petal apex truncate to emarginate
10
10. Petals 2.5-4 cm long; style 4-7.5 cm long, the part exserted from the floral tube 1.5-3 cm long, stigma lobes exserted above the anthers
10. Petals 0.5-2.5 cm long; style 2-5 cm long, the part exserted from the floral tube 0.3-2(-2.5) cm long, stigma lobes surrounded by or slightly elevated above the anthers
Genus Synonyms
| Synonym | Full Citation | Basionym | Type |
|---|---|---|---|
| No synonyms found. | |||