Flora of North America species comparison

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Eremothera minor

Onagraceae subfam. onagroideae

Green River suncup, Nelson's evening-primrose, small evening primrose, small-flower evening primrose
Habit Herbs densely strigillose, inflorescence often also glandular puberulent.
Stems

usually well branched from base, 3–30 cm, usually flowering proximally and distally.

Leaves

cauline, mostly clustered near base, reduced distally, 0.5–2.5 × 0.3–1.5 cm;

petiole 0.5–2 cm;

blade oblanceolate or narrowly oblanceolate, margins entire or sparsely denticulate.

stipules present or absent.
Inflorescences

erect.

Flowers

opening at sunset;

floral tube 0.5–1.9 mm, strigillose in proximal 1/2 inside;

sepals 0.8–1.8 mm;

petals white, fading pinkish, 0.8–1.3 mm;

filaments 0.3–1.3 mm, epipetalous filaments shorter than episepalous, sometimes apparently abortive, anthers 0.5–0.8 mm;

style 1.2–3.2 mm, sparsely short-villous near base, stigma 0.5–0.6 mm diam., surrounded by anthers at anthesis.

floral tube present or, rarely, absent;

sepals 2 or 4 (very rarely 3), deciduous with floral tube, petals, and stamens;

petals yellow, white, pink, red, rarely in combination.
Capsules

cylindrical and thickened proximally, spreading, contorted, subterete, 10–25 × 0.8–1.2 mm, regularly but tardily dehiscent.

Seeds

monomorphic, gray, 1.1–1.2 × 0.4 mm, finely reticulate.

xI> = 7, 10, 11, 15, 18.

2n

= 14.

Eremothera minor

Onagraceae subfam. onagroideae
Phenology Flowering May–early Jun.
Habitat Clay or sandy soils, slopes, flats, sagebrush, rabbitbrush, bitterbrush or saltbush shrublands.
Elevation 700–1800 m. (2300–5900 ft.)
Distribution
from FNA
CA; CO; ID; NV; OR; UT; WA; WY
[WildflowerSearch map]
[BONAP county map]
North America; Mexico; Central America; South America; West Indies; Eurasia; Pacific Islands (New Zealand, Society Islands); Australia
Discussion

P. H. Raven (1969) determined Eremothera minor to be self-compatible and autogamous. The name Sphaerostigma nelsonii A. Heller is superfluous and pertains here.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Genera 21, species 582 (16 genera, 246 species in the flora).

Onagroideae encompass the main lineage of the family, after the early branching of Ludwigia (R. A. Levin et al. 2003, 2004). This large and diverse lineage is distinguished by the presence of a floral tube beyond the apex of the ovary; sepals deciduous with the floral tube, petals, and stamens; pollen shed in monads (or tetrads in Chylismia sect. Lignothera and all but one species of Epilobium); ovular vascular system exclusively transseptal (R. H. Eyde 1981); ovule archesporium multicellular (H. Tobe and P. H. Raven 1996); and change in base chromosome number from x = 8 in Ludwigia to x = 10 or x = 11 at the base of Onagroideae (Raven 1979; Levin et al. 2003). Molecular work (Levin et al. 2003, 2004) substantially supports the traditional tribal classification (P. A. Munz 1965; Raven 1979, 1988); tribes are recognized to delimit major branches within the phylogeny of Onagroideae, where the branches comprise strongly supported monophyletic groups of one or more genera.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 10. FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae > Eremothera Onagraceae
Sibling taxa
E. boothii, E. chamaenerioides, E. gouldii, E. nevadensis, E. pygmaea, E. refracta
Subordinate taxa
Synonyms Sphaerostigma minus, Camissonia minor, Oenothera alyssoides var. minutiflora, O. chamaenerioides var. torta, O. minor, O. minor var. cusickii, S. alyssoides var. minutiflorum, S. tortum, S. tortum var. eastwoodiae
Name authority (A. Nelson) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 210. (2007) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 41. (2007)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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