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ONAGRACEAE EVENING-PRIMROSE FAMILY

Warren L. Wagner & Peter C. Hoch, family description, key to genera; treatment of genera by Warren L. Wagner, except as noted

Annual to perennial herb (to tree). Leaf: cauline or basal, alternate, opposite, or whorled, generally simple and toothed (to pinnately compound); stipules 0 or generally deciduous. Inflorescence: spike, raceme, panicle, or flowers 1 in axils; bracted. Flower: generally bisexual, generally radial, often opening at either dawn or dusk; hypanthium generally prolonged beyond ovary (measured from ovary tip to sepal base); sepals 4(2–7); petals 4(2–7, rarely 0), often fading darker; stamens 2 × or = sepals in number, anthers 2-chambered, opening lengthwise, pollen interconnected by threads; ovary inferior, chambers generally as many as sepals (sometimes becoming 1), placentas axile or parietal, ovules 1–many per chamber, style 1, stigma 4-lobed (or lobes as many as sepals), club-shaped, spheric, or hemispheric. Fruit: capsule, loculicidal (sometimes berry or indehiscent and nut-like). Seed: sometimes winged or hair-tufted.
22 genera, ± 657 species: worldwide, especially western North America; many cultivated (Clarkia, Epilobium, Fuchsia, Oenothera). [Wagner et al. 2007 Syst Bot Monogr 83:1–240] Gaura moved to Oenothera. Fuchsia magellanica Lam. naturalized in northern California. —Scientific Editors: Robert Patterson, Bruce G. Baldwin.
Unabridged references: [Munz 1965 North America Fl II 5:1–278]

Key to Onagraceae

EREMOTHERA
Annual from taproot. Leaf: basal and/or cauline, alternate, simple to 2-pinnate. Inflorescence: spike. Flower: opening at dusk; sepals 4, reflexed singly or in pairs; petals 4, generally white, pink, or rarely red, without spots or ultraviolet reflective area, fading red; longer stamens opposite sepals, anthers attached at middle, pollen grains 3-angled; stigma hemispheric, generally > anthers and cross-pollinated or ± = anthers and self-pollinated. Fruit: straight to coiled, sessile. Seed: in 1 row per chamber, obovoid to oblanceoloid, minutely pitted, sometimes those near base of fruit coarsely papillate.
7 species: western North America. (Greek: desert + Oenothera) [Wagner et al. 2007 Syst Bot Monogr 83:1–240] Incl in Camissonia in TJM (1993).
Unabridged references: [Raven 1969 Contr US Natl Herb 37:161–396]

Key to Eremothera

E. refracta (S. Watson) W.L. Wagner & Hoch
NATIVE
Plant generally ± red, sparsely minutely strigose, especially in inflorescence also glandular; rosette ± 0. Stem: erect, 6–45 cm, peeling. Leaf: < 60 mm, narrowly elliptic to narrowly lanceolate, proximal-most generally oblanceolate, sparsely minutely dentate. Inflorescence: nodding. Flower: hypanthium 4–6 mm; sepals 4–6 mm; petals 3.5–7 mm, white fading ± red; 70–100% of pollen grains 4–5-angled. Fruit: 20–50 mm, 0.7–1 mm wide, spreading or reflexed, cylindric, straight or wavy. Seed: 0.9–1.5 mm, minutely pitted in rows.
2n=14. Sandy slopes, flats, desert scrub; -30–1300 m. Desert; to southern Nevada, southwestern Utah, western Arizona. [Camissonia refracta (S. Watson) P.H. Raven] Cross-pollinated. Mar–May [Online Interchange]
Unabridged synonyms: [Oenothera refracta S. Watson; Oenothera deserti M.E. Jones]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Jul 28 2014
Citation for this treatment: [Author of taxon treatment] 2013. Eremothera, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=89224, accessed on Jul 28 2014

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Bioregions in which Eremothera refracta occurs Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.