Oenothera parviflora |
Oenothera perennis |
|
---|---|---|
northern evening-primrose, small-flower evening-primrose |
little evening-primrose, perennial evening-primrose, perennial sundrops, small sundrops |
|
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, sparsely to moderately strigillose, glandular puberulent distally; from fibrous roots. |
Stems | erect, green or red on proximal parts or throughout, mostly branched from base or only in distal 1/2, 30–150 cm. |
usually erect to slightly decumbent, unbranched to few-branched distally, (3–)15–30(–75) 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 2–4 × 0.2–1.2 cm, petiole (0.2–)0.5–1.2(–2.5) cm, blade oblanceolate to obovate; cauline 3–7 × 0.2–1.2 cm, petiole 0.1–1 cm, blade oblanceolate to obovate, margins entire or weakly and remotely denticulate. |
Inflorescences | erect or ± curved, unbranched or with secondary branches just proximal to main one. |
nodding, flowers in axils of distalmost few nodes. |
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, nearly unscented; buds with free tips to 1 mm, connivent; floral tube 3–10 mm; sepals 2–4 mm; petals bright yellow, fading pale yellow, or orangish yellow to pale pink, 5–10 mm; filaments 3–4 mm, anthers 1–2 mm, pollen 40–70% fertile; style 3–4 mm, stigma surrounded by 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. |
clavate, 4-angled or narrowly 4-winged, 5–10 × 2–3 mm, stipe 1–2 mm; sessile. |
Seeds | 1.1–1.8 × 0.5–1 mm. |
0.7–0.8 × 0.2–0.3 mm. |
2n | = 14. |
= 14. |
Oenothera parviflora |
Oenothera perennis |
|
Phenology | Flowering Jun–Aug. | Flowering May–Jul(–Aug). |
Habitat | Open or disturbed, sandy or gravelly sites, roadsides, fallow fields, clearings, riverbanks, along water courses, salt marshes, coastal meadows. | Fields, open woods, boggy areas. |
Elevation | 0–1700 m. (0–5600 ft.) | (0–)150–900(–1400) m. ((0–)500–3000(–4600) 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]
|
CT; DC; DE; IA; IL; IN; KY; MA; MD; ME; MI; MN; MO; NC; NE; NH; NY; OH; PA; RI; SC; TN; VA; VT; WI; WV; BC; MB; NB; NF; NS; ON; PE; QC; SPM
|
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 perennis, a PTH species that forms a ring of 14 chromosomes in meiosis, is self-compatible and autogamous (G. B. Straley 1977). It is disjunct in Nebraska from the rest of its range in eastern North America, occurring in Garfield, Holt, and Rock counties (R. Kaul, pers. comm.). It is introduced in British Columbia. Oenotherapumila Linnaeus is an illegitimate substitution based on O. perennis Linnaeus, while Kneiffia michauxii Spach is an illegitimate substitution based O. pumila, as is K. pumila Spach, and the three pertain here. (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. Kneiffia |
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 | Kneiffia chrysantha, K. depauperata, K. perennis, O. chrysantha, O. perennis var. rectipilis, O. pumila var. chrysantha, O. pumila var. minima, O. pumila var. pusilla, O. pumila var. rectipilis, O. pusilla |
Name authority | Linnaeus: Syst. Nat. ed. 10, 2: 998. (1759) — (as parviflor) | Linnaeus: Syst. Nat. ed. 10, 2: 998. (1759) |
Web links |