Oenothera parviflora |
Oenothera jamesii |
|
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northern evening-primrose, small-flower evening-primrose |
trumpet 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 biennial or winter-annual, usually predominately and densely strigillose, sometimes also villous with scattered, appressed hairs, rarely with a few pustulate hairs, inflorescence sometimes also glandular puberulent. |
Stems | erect, green or red on proximal parts or throughout, mostly branched from base or only in distal 1/2, 30–150 cm. |
erect, usually green, rarely flushed with red, unbranched or with branches arising obliquely from rosette and secondary branches arising from main stem, 60–180 cm. |
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, basal 10–30 × 2.5–5 cm, cauline 4–20 × 1–5 cm; blade dull green, flat, narrowly oblanceolate, oblanceolate to narrowly elliptic, or narrowly lanceolate, margins bluntly dentate or subentire, teeth widely spaced; bracts persistent. |
Inflorescences | erect or ± curved, unbranched or with secondary branches just proximal to main one. |
erect, usually unbranched, rarely with few lateral branches. |
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 sunset; buds erect, 7–12 mm diam., with free tips terminal, erect, 0.5–3 mm; floral tube persistent on ovary after anthesis, (60–)80–120(–160) mm; sepals yellowish green, red-striped to red throughout, 30–55 mm; petals yellow, fading orange or pale yellow, very broadly obcordate, 40–50 mm; filaments 23–30 mm, anthers 12–22 mm, pollen 90–100% fertile; style 90–170(–200) mm, stigma exserted beyond anthers at anthesis. |
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. |
erect or slightly spreading, dull green or gray-green when dry, narrowly lanceoloid, 20–50 × 6–12 mm, free tips of valves 2.5–5 mm. |
Seeds | 1.1–1.8 × 0.5–1 mm. |
1–1.2 × 0.7–1.3 mm. |
2n | = 14. |
= 14. |
Oenothera parviflora |
Oenothera jamesii |
|
Phenology | Flowering Jun–Aug. | Flowering Jul–Sep(–Oct). |
Habitat | Open or disturbed, sandy or gravelly sites, roadsides, fallow fields, clearings, riverbanks, along water courses, salt marshes, coastal meadows. | Sandy stream banks, ditches, moist areas, cultivated areas, disturbed roadsides. |
Elevation | 0–1700 m. (0–5600 ft.) | (30–)300–1800 m. ((100–)1000–5900 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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KS; OK; TX; Mexico (Coahuila, Nuevo León, Puebla) [Introduced in e Asia (Japan), s Africa, Atlantic Islands (Canary Islands)] |
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.) |
Oenothera jamesii has plastome I and a AA genome composition; it is known in the flora area from southern Kansas (Clark County), central Oklahoma, and Texas. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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. Oenothera > subsect. Oenothera |
Sibling 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 | Onagra jamesii, O. communis var. jamesii |
Name authority | Linnaeus: Syst. Nat. ed. 10, 2: 998. (1759) — (as parviflor) | Torrey & A. Gray: Fl. N. Amer. 1: 493. (1840) |
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