Oenothera suffrutescens |
Oenothera hartwegii |
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linda tarde, scarlet beeblossom, scarlet evening-primrose, scarlet gaura, wild honeysuckle |
Fendler evening primrose, Hartweg's sundrops |
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Habit | Herbs perennial, densely strigillose, sometimes also long-villous proximally, sometimes glabrate; from a deep, thick taproot, often with branching underground stems, or branching only at surface, these often becoming horizontal or nearly so and giving rise to new plants. | Herbs perennial, sometimes suffrutescent, strigillose, glandular puberulent, glabrous, hirtellous, or short-pilose; from a stout taproot. | ||||||||||||||||
Stems | erect or ascending, usually many-branched, 10–120 cm. |
1–many, erect to ascending, unbranched to densely branched, 4–60 cm. |
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Leaves | in a basal rosette (but not present at flowering) and cauline, 0.7–6.5 × 0.1–1.5 cm, blade linear to narrowly elliptic, margins entire or remotely and coarsely serrate. |
0.3–6.5 × 0.04–1.2 cm, sometimes fascicles of small leaves 0.1–1.5 cm present in non-flowering axils; petiole 0–0.2 cm; blade elliptic, lanceolate, linear, or filiform to ovate or oblanceolate, usually not much reduced distally, proximalmost leaves sometimes obovate to spatulate, base attenuate to obtuse, truncate, or subcordate, sometimes clasping, margins entire or serrate, often undulate, apex acute. |
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Flowers | 4-merous, zygomorphic, opening near sunset; floral tube 4–11(–13) mm; sepals 5–9(–10) mm; petals white, fading salmon pink to scarlet-red, slightly unequal, obovate to elliptic-obovate or elliptic, 3–7(–8) mm, abruptly clawed; filaments 3–6.5(–7) mm, anthers (2.5–)3–5(–5.5) mm; style 10–22 mm, stigma exserted beyond anthers at anthesis. |
usually 1 per stem opening per day in afternoon or near sunset; buds with free tips 0.5–6 mm; floral tube 16–50(–60) mm, funnelform in distal 1/2 or less; sepals 7–28 mm; petals yellow, fading pale pinkish or pale purple, 10–35 mm; filaments 4–13 mm, anthers 5–13 mm, pollen 85–100% fertile; style 25–65(–75) mm, stigma yellow, quadrangular, usually exserted beyond anthers. |
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Capsules | erect, pyramidal in distal 1/2 and abruptly constricted to terete proximal part, pyramidal part weakly or strongly angled, not conspicuously bulging at base, 4–9 × (1–)1.5–3 mm; sessile. |
6–40 × 2–4 mm, hard, promptly dehiscent throughout their length. |
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Seeds | (1–)3 or 4, light to reddish brown, 1.5–3 × 1–1.5 mm. |
obovoid, 1–2.5 mm. |
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2n | = 14, 28, 42, 56. |
= 14, 28. |
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Oenothera suffrutescens |
Oenothera hartwegii |
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Phenology | Flowering Apr–Aug(–Nov). | |||||||||||||||||
Habitat | Sandy or clay soil, often calcareous, desert shrublands to pinyon-juniper or oak woodlands, grasslands, disturbed areas. | |||||||||||||||||
Elevation | 150–2000(–3000) m. (500–6600(–9800) ft.) | |||||||||||||||||
Distribution |
AZ; CA; CO; IA; IL; IN; KS; MI; MN; MO; MT; ND; NE; NM; NV; NY; OK; SD; TX; UT; WI; WY; AB; BC; MB; ON; SK; Mexico (Aguascalientes, Chihuahua, Coahuila, Durango, Guanajuato, Hidalgo, Jalisco, México, Nuevo León, Oaxaca, Puebla, San Luis Potosí, Sonora, Tamaulipas, Veracruz, Zacatecas); introduced in South America (Brazil); Europe (Wales)
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c United States; sw United States; n Mexico
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Discussion | Oenothera suffrutescens is naturalized sporadically in southern California (Los Angeles, San Diego, Santa Barbara, and Ventura counties; although native in eastern part of the state), Illinois, Indiana, Michigan, New York, southern Ontario, and Wisconsin. P. H. Raven and D. P. Gregory (1972[1973]) determined Oenothera suffrutescens to be self-incompatible and polyploid. It is known to form hybrids with O. calcicola and O. hispida. Schizocarya kunthii Spach is an illegitimate name based on Gaura epilobioides that pertains here. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Subspecies 5 (5 in the flora). Oenothera hartwegii consists of five intergrading subspecies, which are generally locally common on rocky, sandy, gypsum, or limestone soil in arid to relatively mesic open areas, in southeastern Colorado, southwestern Kansas, western Oklahoma, Texas (except eastern part), New Mexico, southeastern and east-central Arizona, and in Mexico from Chihuahua, northern Coahuila, and northwestern Tamaulipas south to Aguascalientes. H. F. Towner (1977) found that O. hartwegii is self-incompatible and usually vespertine; two of the subspecies (filifolia and maccartii) open early in the afternoon and are pollinated both day and evening. (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. Gaura > subsect. Campogaura | Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Calylophus > subsect. Salpingia | ||||||||||||||||
Sibling taxa | ||||||||||||||||||
Subordinate taxa | ||||||||||||||||||
Synonyms | Gaura suffrutescens, G. bracteata, G. coccinea, G. coccinea var. arizonica, G. coccinea var. epilobioides, G. coccinea var. glabra, G. coccinea var. integerrima, G. coccinea var. parvifolia, G. epilobioides, G. glabra, G. induta, G. linearis, G. marginata, G. multicaulis, G. odorata, G. parvifolia, G. spicata | Calylophus hartwegii, Galpinsia hartwegii, Salpingia hartwegii | ||||||||||||||||
Name authority | (Seringe) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 214. (2007) | Bentham: Pl. Hartw., 5. (1839) — (as hartwegi) | ||||||||||||||||
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