Oenothera deltoides |
Oenothera sect. Anogra |
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basket evening-primrose, birdcage evening primrose, desert lantern, devil's lantern, dune primrose, hairy evening primrose, lion-in-a-cage |
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Habit | Herbs usually winter-annual, sometimes perennial, glabrous, glandular puberulent, strigillose, and/or villous, sometimes more villous distally, hairs sometimes very curly, especially on flower parts; from a taproot or relatively long, fleshy roots. | Herbs winter-annual or perennial, caulescent; from a taproot, sometimes lateral roots producing adventitious shoots. | ||||||||||||||||||||||||||||||||||||||||||||||||
Stems | central stem usually erect, usually thickened at base and spongy, branched or unbranched, branches few–several, slender, decumbent to ascending, from base, usually encircling central stem in older plants, 10–40(–100) cm. |
decumbent to ascending or erect, unbranched or with short, lateral branches, epidermis white or pink, exfoliating proximally. |
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Leaves | in a basal rosette and cauline, rosette usually well developed (except subsp. howellii), basal 5–25 × 1–5 cm, cauline 4–12(–18) × 0.5–4 cm; petiole 1.5–8 cm; blade rhombic-obovate, lanceolate, or oblanceolate, margins subentire, dentate, or pinnatifid. |
basal and cauline, sometimes forming conspicuous basal rosette, sometimes this weakly developed or absent (at least during flowering), 1–13(–26) cm; blade margins sinuate-dentate to pinnatifid, denticulate, subentire, or entire. |
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Inflorescences | solitary flowers in axils of distal leaves. |
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Flowers | 1–several opening per day near sunset; buds nodding, weakly or strongly quadrangular or fluted in distal 1/2, with free tips 0–9 mm; floral tube 20–40 mm; sepals (13–)15–35 mm, not spotted; petals white, fading pink to deep pink, broadly obovate or obcordate, 15–44 mm; filaments 8–15 mm, anthers 5–14 mm; style 35–60 mm, stigma exserted beyond anthers at anthesis. |
opening near sunset, with a sweet scent or nearly unscented; buds nodding by recurved floral tube, usually sharply or bluntly quadrangular in cross section (sometimes fluted in distal 1/2 in O. deltoides), without free tips or free tips short (sometimes to 9 mm in O. deltoides); floral tube 15–40(–50) mm; sepals separatingin pairs or individually; petals white, fading pink, obcordate to obovate; stigma deeply divided into 4 linear lobes. |
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Capsules | spreading, straight to curved, becoming somewhat woody in age, cylindrical to slightly 4-angled, widest toward base, tapering from base to apex, (15–)30–80 × 1.5–5 mm; sessile. |
straight, curved upward, spreading, or contorted, sometimes woody in age, cylindrical, obtusely 4-angled, gradually tapering from base to apex, dehiscent 1/2 to nearly throughout; sessile. |
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Seeds | numerous, in 1 row per locule, buff with dark spots or black, narrowly obovoid, 1.5–2.8 mm. |
numerous, in 1 row per locule, obovoid, surface minutely alveolate, but appearing smooth. |
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2n | = 14, 28. |
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Oenothera deltoides |
Oenothera sect. Anogra |
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Distribution |
w United States; nw Mexico
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w North America; n Mexico; c North America |
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Discussion | Subspecies 5 (5 in the flora). Oenothera deltoides is self-incompatible or self-compatible (W. M. Klein 1964; W. L. Wagner et al. 2007; K. E. Theiss et al. 2010). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Species 8 (7 in the flora). Section Anogra consists of eight species (17 taxa) native to western North America including Mexico, found usually in dry, sandy soil in a wide variety of habitats in the Chihuahuan, Great Basin, Mojave, and Sonoran deserts, to grasslands and open sites in montane forest, -50 to 3300 m. Only one species, Oenothera wigginsii Klein, occurs entirely outside the United States, while four others occur within the flora area but extend into northern Mexico. Section Anogra is included within a strongly supported clade with the two species of sect. Kleinia in recent molecular studies (R. A. Levin et al. 2004; M. E. K. Evans et al. 2005, 2009). The support levels for the topology within this clade are generally very weak, with only a few taxa grouping into moderately to strongly supported groups (for example, members of O. pallida complex, O. deltoides + O. wigginsii, O. californica + O. arizonica and O. neomexicana). Species of sect. Anogra have vespertine flowers that are outcrossed and pollinated by hawkmoths or have flowers that are partly autogamous (D. P. Gregory 1964; W. M. Klein 1964, 1970). In Oenothera deltoides the capsule valves split open widely and disperse seeds, while the entire plant forms a so-called tumbleweed. Other species in the section appear to have more passive seed dispersal; the capsules dehisce while the plant remains rooted. The basal rosette may not be evident at time of flowering or not developed. When this is the case, or when the dimensions of the basal leaves are very similar to the cauline ones, only one range for leaf dimensions is given. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 10. | FNA vol. 10. | ||||||||||||||||||||||||||||||||||||||||||||||||
Parent taxa | Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Anogra | Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera | ||||||||||||||||||||||||||||||||||||||||||||||||
Sibling taxa | ||||||||||||||||||||||||||||||||||||||||||||||||||
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Synonyms | Anogra deltoides | Anogra, O., O. subg. anogra | ||||||||||||||||||||||||||||||||||||||||||||||||
Name authority | Torrey & Frémont in J. C. Frémont: Rep. Exped. Rocky Mts., 315. (1845) | (Spach) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 179. (2007) | ||||||||||||||||||||||||||||||||||||||||||||||||
Web links |