Oenothera linifolia |
Oenothera glazioviana |
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threadleaf evening-primrose, threadleaf sundrop |
garden evening-primrose, large-flower evening primrose, red-sepal evening-primrose |
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Habit | Herbs annual, caulescent, strigillose or glabrous, also often glandular puberulent, especially distally; from a sparsely branched taproot. | Herbs biennial, densely to sparsely strigillose and villous, with spreading, red-pustulate hairs, also glandular puberulent and with only a few appressed hairs near inflorescence. |
Stems | unbranched or with many ascending branches arising near base, erect, 10–50 cm. |
erect, green or flushed with red on proximal parts, sometimes inflorescence axis red, usually withside branches obliquely arising from rosette and secondary branches from main stem, 50–150 cm. |
Leaves | in a basal rosette and cauline, basal 1–2(–4) × 0.2–0.6 cm, petiole 0.2–1(–1.5) cm, blade ovate to obovate or narrowly elliptic; cauline 1–4 × less than 0.1 cm, sessile, blade linear or filiform. |
in a basal rosette and cauline, basal 13–30 × 3–5 cm, cauline 5–15 × 2.5–4 cm; blade dark to bright green, white- or red-veined, narrowly oblanceolate to oblanceolate, sometimes narrowly elliptic to lanceolate distally, margins usually conspicuously crinkled, sometimes undulate, bluntly dentate, teeth widely spaced, sometimes sinuate-dentate proximally or lobed; bracts persistent. |
Inflorescences | erect, unbranched. |
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Flowers | usually 1–3 opening per day near sunrise; buds without free tips; sepals 1.5–2 mm; petals bright yellow, fading pink, obcordate to obovate, 3–5(–7) mm; filaments 1–2 mm, anthers 0.5–1 mm; style 1–2 mm, stigma surrounded by anthers at anthesis. |
opening near sunset; buds erect, 7–9 mm diam., with free tips terminal, erect to spreading, 5–8 mm; floral tube 35–50 mm; sepals yellowish green, usually flushed with red or red-striped, sometimes very dark red throughout, 28–45 mm; petals yellow to pale yellow, fading yellowish white and somewhat translucent, very broadly obcordate, 35–50 mm; filaments 17–25 mm, anthers 10–12 mm, pollen ca. 50% fertile; style 50–80 mm, stigma exserted beyond anthers at anthesis. |
Capsules | ellipsoid-rhombic to subglobose, 4-angled, 4–6(–10) × 1.5–3 mm, stipe 0–4 mm, valve midrib raised at distal end, indehiscent or tardily dehiscent distally; sessile. |
erect or slightly spreading, dull green when dry, lanceoloid, 20–35 × 5–6 mm, free tips of valves 0.8–1.5 mm. |
Seeds | clustered in each locule, ovoid, surface minutely papillose, 1 × 0.5 mm. |
1.3–2 ×1–1.5 mm, ca. 50% abortive. |
2n | = 14. |
= 14. |
Oenothera linifolia |
Oenothera glazioviana |
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Phenology | Flowering Apr–Jun(–Aug). | Flowering (Jun–)Jul–Sep(–Oct). |
Habitat | Prairies, open woodlands, open rocky and sandy sites, roadsides. | Open, disturbed sites. |
Elevation | 0–400 m. (0–1300 ft.) | 20–600(–1400) m. (100–2000(–4600) ft.) |
Distribution |
AL; AR; FL; GA; IL; KS; KY; LA; MO; MS; NC; OK; SC; TN; TX
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AL; AR; CA; CT; IL; IN; MA; ME; MI; MT; NC; NH; NJ; NY; OR; PA; RI; VT; WA; WI; WV; BC; MB; NS; ON; QC [Introduced in North America; introduced nearly worldwide in temperate and subtropical regions]
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Discussion | Kneiffia linearifolia Spach (1835) is an illegitimate name based on Oenothera linifolia. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Oenothera glazioviana originated by hybridization between two cultivated or naturalized species in Europe and was introduced into the horticultural trade by Carter and Company of England in 1860 (R. E. Cleland 1972; P. H. Raven et al. 1979). The oldest name applied to this entity was based on plants cultivated in Rio de Janeiro in 1868; clearly, O. glazioviana must have spread very rapidly. Oenothera glazioviana is a PTH species and forms a ring of 12 chromosomes and 1 bivalent in meiosis, and is self-compatible and autogamous (W. Dietrich et al. 1997). It has plastome II or III and a AB genome composition. (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. Peniophyllum | Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Oenothera > subsect. Oenothera |
Sibling taxa | ||
Synonyms | Kneiffia linifolia, O. linifolia var. glandulosa, Peniophyllum linifolium | O. erythrosepala, O. grandiflora subsp. erythrosepala, Onagra erythrosepala |
Name authority | Nuttall: J. Acad. Nat. Sci. Philadelphia 2: 120. (1821) | Micheli in C. F. P. von Martius et al.: Fl. Brasil. 13(2): 178. (1875) |
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