Oenothera stricta |
Oenothera humifusa |
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Chilean evening primrose |
seabeach evening-primrose |
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Habit | Herbs annual or short-lived perennial, densely strigillose, sometimes also villous, also becoming glandular puberulent distally. | |
Stems | erect to decumbent, much branched, 10–50(–90) cm. |
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Leaves | in a basal rosette and cauline, basal 4–8 × 0.7–1 cm, cauline 1–7 × 0.3–1.5 cm; blade usually grayish green, narrowly oblong to narrowly elliptic or narrowly obovate, margins remotely shallowly dentate to subentire; bracts spreading, flat. |
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Flowers | usually 1 opening per day near sunset; buds erect, with free tips erect and appressed or slightly spreading, 0.5–2 mm; floral tube 15–35 mm; sepals3–11 mm; petals yellow, very broadly obovate or obcordate, 4.5–16 mm; filaments 4–11 mm, anthers 2–5.5 mm, pollen ca. 50% fertile; style 23–45 mm, stigma surrounded by anthers at anthesis. |
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Capsules | cylindrical, sometimes slightly enlarged toward apex, 15–45 × 2–3 mm. |
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Seeds | usually ellipsoid to broadly ellipsoid, rarely subglobose, 1–2 × 0.5–0.9 mm. |
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2n | = 14. |
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Oenothera stricta |
Oenothera humifusa |
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Phenology | Flowering Apr–Nov. | |
Habitat | Dunes, open sandy places along or near Atlantic coast. | |
Elevation | 0–10 m. (0–0 ft.) | |
Distribution |
South America [Introduced, California] |
AL; DE; FL; GA; LA; MD; MS; NC; NJ; PA; SC; VA; Dunes; open sandy places along or near Atlantic coast; West Indies (Cuba); Bermuda
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Discussion | Subspecies 2 (1 in the flora). Oenothera stricta is a PTH species and forms a ring of 14 chromosomes in meiosis, and is self-compatible and autogamous (W. Dietrich 1977). Subspecies stricta is naturalized in many areas around the world and may be so in California. Subspecies altissima W. Dietrich occurs only in Argentina. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Oenothera humifusa is a PTH species and forms a ring of 14 chromosomes in meiosis, and is self-compatible and autogamous (W. Dietrich and W. L. Wagner 1988). The inland collection from Iredell County, North Carolina, presumably represents an introduction. There are two geographically separated morphological forms of O. humifusa. Plants of one form are somewhat decumbent, with subentire cauline leaves and bracts; this form occurs in the southern part of the range. The other form is more upright, with more deeply divided leaves; it occurs from North Carolina northward. (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. Munzia > ser. Allochroa | Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Oenothera > subsect. Raimannia |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | O. niveifolia, O. sinuata var. humifusa, Raimannia humifusa | |
Name authority | Ledebour ex Link: Enum. Hort. Berol. Alt. 1: 377. (1821) — (as striata) | Nuttall: Gen. N. Amer. Pl. 1: 245. (1818) |
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