Oenothera parviflora |
Oenothera fruticosa |
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northern evening-primrose, small-flower evening-primrose |
narrow-leaf evening-primrose |
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Habit | Herbs biennial, sparsely strigillose, glandular puberulent, and villous with pustulate or non-pustulate hairs, sometimes predominately strigillose proximally or predominately villous with pustulate or non-pustulate hairs distally, glabrous, or some mixture of strigillose, glandular puberulent, or sparsely villous distally, sometimes appearing glabrous to the naked eye. | Herbs perennial, moderately to densely strigillose and/or villous, glandular puberulent, or glabrous; from fibrous roots, not or rarely producing rhizomes. | ||||
Stems | erect, green or red on proximal parts or throughout, mostly branched from base or only in distal 1/2, 30–150 cm. |
erect to decumbent, branched or unbranched, (10–)30–80 cm. |
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Leaves | in a basal rosette and cauline, basal 10–30 × 1–4 cm, cauline 4–18 × 1–3 cm; blade usually bright green, sometimes pale green distally, white- or red-veined, narrowly oblanceolate, narrowly elliptic to lanceolate, or oblong, margins usually flat, rarely undulate, regularly dentate to remotely denticulate, sometimes teeth widely spaced; bracts persistent. |
in a basal rosette and cauline, rosette usually withered by anthesis, surfaces sometimes glaucous, especially abaxially, basal 3–12 × 0.5–3 cm, petiole 1–4 cm, blade oblanceolate to obovate, margins subentire, dentate, or denticulate, sometimes undulate; cauline 2–6(–11) × (0.1–)0.5–2(–5) cm, petiole 0.1–2(–6) cm, blade linear, lanceolate to oblanceolate, narrowly elliptic, or ovate, margins subentire or dentate or denticulate, sometimes undulate. |
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Inflorescences | erect or ± curved, unbranched or with secondary branches just proximal to main one. |
usually erect, rarely nodding, flowers in axils of distalmost few nodes. |
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Flowers | opening near sunset; buds erect, 3–5 mm diam., with free tips subterminal, spreading to erect, 0.5–5 mm; floral tube 22–40 mm; sepals green to yellowish green or flushed with red or dark red, sometimes only red-flecked, 7–17 mm; petals yellow to pale yellow, fading pale yellow to pale yellowish orange, very broadly obcordate, 8–15(–20) mm; filaments 7–13 mm, anthers 3.5–6 mm, pollen ca. 50% fertile; style 25–50 mm, stigma surrounded by anthers at anthesis. |
opening near sunrise; buds with free tips 0.5–8(–13) mm, connivent, sometimes spreading; floral tube 5–20 mm; sepals 5–20 mm; petals pale to bright yellow, fading pale pink, orangish pink, or yellow, (8–)15–25(–30) mm; filaments 5–15 mm, anthers 4–7 mm, pollen 85–100% fertile; style 12–20 mm, stigma exserted beyond anthers at anthesis. |
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Capsules | erect or slightly spreading, usually greenish black when dry, narrowly lanceoloid to lanceoloid, 20–40 ×3.5–5 mm, free tips of valves 1–1.5 mm. |
clavate to oblong-clavate or oblong-ellipsoid, 4-angled to 4-winged, (5–)10–17(–20) × (2–)3–4(–6) mm, stipe 0.1–10 mm; sessile. |
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Seeds | 1.1–1.8 × 0.5–1 mm. |
1 × 0.5 mm. |
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2n | = 14. |
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Oenothera parviflora |
Oenothera fruticosa |
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Phenology | Flowering Jun–Aug. | |||||
Habitat | Open or disturbed, sandy or gravelly sites, roadsides, fallow fields, clearings, riverbanks, along water courses, salt marshes, coastal meadows. | |||||
Elevation | 0–1700 m. (0–5600 ft.) | |||||
Distribution |
CT; DC; DE; IA; IL; IN; KY; MA; MD; ME; MI; MN; MO; NC; ND; NH; NJ; NY; OH; PA; RI; TN; VA; VT; WI; WV; BC; NB; NF; NS; ON; PE; QC [Introduced in Europe, Asia (ne China, Japan), s Africa, Pacific Islands (New Zealand), Australia]
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e North America; c North America
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Discussion | Oenothera parviflora is a PTH species and forms a ring of 14 chromosomes in meiosis, and is self-compatible and autogamous (W. Dietrich et al. 1997). It has plastome IV and a BC genome composition. Onagra chrysantha Spach 1835, not Michaux 1803, is a superfluous name, as is Onagra chrysantha var. parviflora (Linnaeus) Spach, and both pertain here. O. biformiflora var. cruciata R. R. Gates is an invalid name that pertains here. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Subspecies 2 (2 in the flora). Oenothera fruticosa as delimited here is a polymorphic species. Previous classification of this group has undergone numerous reorganizations due to the difficulties in separating populations into discrete morphological taxa. In the past it has most frequently been treated as two species, O. fruticosa and O. tetragona Roth, often with a dozen or more infraspecific taxa recognized. The broad delimitation of G. B. Straley (1977) is followed here with one species consisting of two subspecies that appear to intergrade extensively across a wide area of overlap. Straley determined O. fruticosa to be self-incompatible and polyploid. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 10. | FNA vol. 10. | ||||
Parent taxa | Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Oenothera > subsect. Oenothera | Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Kneiffia | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | O. ammophiloidesr. var. flecticaulis, O. ammophiloides var. parva, O. angustifolia, O. angustissima, O. angustissima var. quebecensis, O. apicaborta, O. atrovirens, O. biennis var. cruciata, O. biennis var. parviflora, O. biformiflora, O. cleistantha, O. comosa, O. cruciata, O. cruciata var. sabulonensis, O. deflexa, O. flecticaulis, O. hazeliae, O. hazeliae var. parviflora, O. hazeliae var. subterminalis, O. intermedia, O. laevigata, O. laevigata var. scitula, O. laevigata var. similis, O. novae-scotiae, O. novae-scotiae var. distantifolia, O. novae-scotiae var. intermedia, O. parva, O. parviflora subsp. angustissima, O. parviflora var. angustissima, O. robinsonii, O. rubricapitata, O. scitula, O. subterminalis, O. venosa, Onagra biennis var. cruciata, O. chrysantha var. cruciata, O. cruciata, O. parviflora | Kneiffia fruticosa | ||||
Name authority | Linnaeus: Syst. Nat. ed. 10, 2: 998. (1759) — (as parviflor) | Linnaeus: Sp. Pl. 1: 346. (1753) | ||||
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