Taraxia subacaulis |
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diffuse-flower evening-primrose, long leaf suncup, long-leaf evening-primrose, northern sun-cup, stemless evening-primrose |
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Habit | Herbs usually glabrate, rarely sparsely strigillose, especially on leaf blade veins and margins; taproot thick, deep, sometimes branched in age, producing new rosettes. |
Leaves | 2–22 × 0.7–4.2 cm; petiole narrowly winged, 1–12 cm; blade lanceolate to narrowly elliptic, base attenuate, margins usually subentire to sinuate, sometimes deeply and irregularly pinnatifid, apex acuminate. |
Flowers | opening near sunrise; floral tube 1.5–3 mm, with short, matted hairs inside near base; sepals 4–15 mm, mostly glabrous, sometimes very minutely strigillose; petals yellow, 5–16 mm, often apiculate; episepalous staminal filaments 1.8–6.5 mm, epipetalous ones 0.5–2.5 mm, anthers 0.9–2 mm; sterile prolongation of ovary 15–80 mm, style 4–8.5(–11) mm, glabrous or sparsely pubescent near base, stigma usually surrounded by longer anthers at anthesis, rarely exserted beyond anthers. |
Capsules | 4-angled, oblong-ellipsoid, 11–28 × 5–8 mm, walls thick, scarcely distended by seeds, becoming blackened and persistent on plants for 1+ years after shedding seeds; rarely with pedicel to 10 mm. |
Seeds | uniformly tan to light brown, ellipsoid-oblanceoloid, 1.3–1.9 × 0.6–1 mm, coarsely pitted. |
2n | = 14. |
Taraxia subacaulis |
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Phenology | Flowering late Mar–Jul. |
Habitat | Meadows, seasonally moist open places, from foothills to mountains. |
Elevation | 400–2900 m. (1300–9500 ft.) |
Distribution |
CA; CO; ID; MT; NV; OR; UT; WA; WY
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Discussion | Taraxia subacaulis occurs well inland from Pacific coastal areas. Its only occurrence in Colorado is in Moffat and Routt counties. P. H. Raven (1969) determined Taraxia subacaulis to be self-compatible and, usually, facultatively autogamous. The species is distinctive, but is sister to T. tanacetifolia in molecular analyses (R. A. Levin et al. 2004; W. L. Wagner et al. 2007). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 10. |
Parent taxa | Onagraceae > subfam. Onagroideae > tribe Onagreae > Taraxia |
Sibling taxa | |
Synonyms | Jussiaea subacaulis, Camissonia subacaulis, Oenothera heterantha, O. heterantha var. taraxacifolia, O. subacaulis, O. subacaulis var. taraxacifolia, T. heterantha, T. taraxacifolia |
Name authority | (Pursh) Rydberg: Mem. New York Bot. Gard. 1: 281. (1900) |
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