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Key to families | Table of families and genera
Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.
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]
1. Fruit ± same width throughout; flowers at proximal nodes 0
2. Sepals 1.5–2.5 mm; petals 1.8–3 mm; stigma ± surrounded by anthers ..... E. chamaenerioides
2' Sepals 4–6 mm; petals 3.5–7 mm; stigma exceeding anthers ..... E. refracta
1' Fruit base wider than tip; flowers at proximal nodes present or 0
3. Inflorescence erect; petals 0.8–1.3 mm; sepals 0.8–1.8 mm ..... E. minor
3' Inflorescence nodding; petals 3–7.5 mm; sepals (2.7)4–8 mm ..... E. boothii
4. Rosette present at time of 1st flower in late winter, spring; bracts not leaf-like, ± inconspicuous; plant ± glabrous or hairs not spreading
5. Fruit 2–3.8 mm wide at base, woody, curved outward but not downward ..... subsp. condensata
5' Fruit 1–2.3 mm wide at base, not woody, curved outward or downward
6. Fruit 1.7–2.3 mm wide at base, curved outward ..... subsp. decorticans
6' Fruit 1–1.6 mm wide at base, generally curved downward ..... subsp. desertorum
4' Rosette generally withered by time of 1st flower in late spring, summer; bracts leaf-like, conspicuous; plant hairs often spreading
7. Plant strigose, also rarely with spreading or glandular hairs; seeds all minutely pitted ..... subsp. alyssoides
7' Plant hairs spreading, some glandular; seeds of 2 kinds, minutely pitted and coarsely papillate
8. Plant generally 15–40 cm; cauline leaves lanceolate to narrowly ovate, serrate ..... subsp. boothii
8' Plant 5–20 cm; cauline leaves ± narrowly lanceolate or lower oblanceolate, ± entire to minutely serrate ..... subsp. intermedia
Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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