Oenothera grandis |
Oenothera perennis |
|
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largeflower eveningprimrose, showy evening-primrose |
little evening-primrose, perennial evening-primrose, perennial sundrops, small sundrops |
|
Habit | Herbs annual, strigillose and sparsely villous, also glandular puberulent distally. | Herbs perennial, sparsely to moderately strigillose, glandular puberulent distally; from fibrous roots. |
Stems | erect to ascending, often with ascending lateral branches, 15–60(–100) cm. |
usually erect to slightly decumbent, unbranched to few-branched distally, (3–)15–30(–75) cm. |
Leaves | in a basal rosette and cauline, basal 5–13 × 1–3 cm, cauline 3–10 × 1.5–3.5 cm; blade green, narrowly oblanceolate to narrowly elliptic, margins lobed or dentate, lobes often dentate; bracts spreading, flat. |
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 | nodding, flowers in axils of distalmost few nodes. |
|
Flowers | 1–few opening per day near sunset; buds erect, with free tips terminal, erect or hornlike, 1.5–5 mm; floral tube 25–45 mm; sepals 15–30 mm; petals yellow, very broadly obovate or shallowly obcordate, 25–40 mm; filaments 12–22 mm, anthers 4–11 mm, pollen 85–100% fertile; style 40–75 mm, stigma exserted beyond 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 | cylindrical, sometimes slightly enlarged toward apex, 25–50 ×2–3 mm. |
clavate, 4-angled or narrowly 4-winged, 5–10 × 2–3 mm, stipe 1–2 mm; sessile. |
Seeds | broadly ellipsoid to subglobose, 0.8–1.5 × 0.5–0.9 mm. |
0.7–0.8 × 0.2–0.3 mm. |
2n | = 14. |
= 14. |
Oenothera grandis |
Oenothera perennis |
|
Phenology | Flowering Mar–Sep. | Flowering May–Jul(–Aug). |
Habitat | Open, sandy sites. | Fields, open woods, boggy areas. |
Elevation | 0–1500(–2200) m. (0–4900(–7200) ft.) | (0–)150–900(–1400) m. ((0–)500–3000(–4600) ft.) |
Distribution |
AL; AR; CO; CT; FL; IL; IN; KS; LA; MD; MI; MO; NC; NE; NJ; NM; TX; Mexico (Tamaulipas)
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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
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Discussion | Oenothera grandis is probably native to eastern New Mexico and Colorado, Arkansas, Kansas, Louisiana, Missouri, Nebraska, Oklahoma, and Texas, and northeastern Tamaulipas, Mexico. Scattered collections made in other states probably represent introductions (W. Dietrich and W. L. Wagner 1988). Oenothera grandis is self-incompatible (W. Dietrich and W. L. Wagner 1988). Oenothera laciniata Hill var. occidentalis Small and O. laciniata var. grandis Britton are illegitimate superfluous names based on O. sinuata Linnaeus var. grandiflora S. Watson and pertain 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. Raimannia | Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Kneiffia |
Sibling taxa | ||
Synonyms | O. laciniata var. grandiflora, O. sinuata var. grandiflora, Raimannia grandis | 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 | Smyth: Trans. Kansas Acad. Sci. 16: 160. (1899) | Linnaeus: Syst. Nat. ed. 10, 2: 998. (1759) |
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