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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. boothii (Douglas) W.L. Wagner & Hoch
NATIVE
Plant generally ± red; rosette generally 0 (to well-developed); hairs minutely strigose and spreading, some glandular, especially in inflorescence. Stem: erect, peeling. Leaf: lanceolate to narrowly elliptic or narrowly ovate, sparsely minutely dentate or serrate; proximal oblanceolate or 0. Inflorescence: nodding; flowers generally 0 at proximal nodes. Flower: hypanthium 4–8 mm; sepals (2.7)4–8 mm; petals 3–7.5 mm, generally white (red). Fruit: 8–35 mm, 1–3.8 mm wide, cylindric, tapered to tip, ± curved outward to strongly wavy and twisted, persistent, tardily dehiscent. Seed: 1.4–2.1 mm, generally of 2 kinds, minutely pitted in rows, pale brown and coarsely papillate, dark brown.
2n=14. [Camissonia boothii (Douglas) P.H. Raven] Cross-pollinated. [Online Interchange]
Unabridged synonyms: [Oenothera boothii Douglas]

E. boothii subsp. condensata (Munz) W.L. Wagner & Hoch
NATIVE
Plant stout, ± glabrous, except inflorescence minutely strigose or glandular-hairy; rosette well developed. Stem: 5–20(30) cm. Leaf: 25–100(130) mm, generally lanceolate to oblanceolate, ± entire to minutely dentate. Inflorescence: bracts inconspicuous. Fruit: 2–3.8 mm wide, curved outward.
Sandy slopes, washes, desert scrub; -70–1200 m. Desert; to southern Utah, western Arizona, northwestern Mexico. [Camissonia boothii subsp. condensata (Munz) P.H. Raven] Intergrades widely with Eremothera boothii subsp. desertorum. Feb–May [Online Interchange]
Unabridged synonyms: [Oenothera boothii subsp. condensata (Munz) Munz]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Oct 24 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=89262, accessed on Oct 24 2014

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Geographic subdivisions indicated for the distribution of Eremothera boothii subsp. condensata 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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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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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.