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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, glabrous. Stem: erect, generally branched. Leaf: cauline, opposite (sometimes also basal). Inflorescence: cyme. Flower: parts in 4s or generally 5s; calyx lobes >> tube (discounting thin membrane between lobes in Zeltnera davyi), appressed to corolla tube, generally not keeled; corolla salverform, white or generally pink, lobes <= tube, ± entire, scales 0, nectaries pits 0 (nectaries elsewhere 0); stamens often initially curved to 1 side, dehisced anthers spirally twisted; ovary sessile, style generally thread-like, deciduous, entire or cleft < 1 mm, stigmas 1, 2-lobed, or 2, stigmas or lobes wedge- to fan-shaped.
± 25 species: temperate, dry-mesic tropics, North America, South America. (L. Zeltner, N. Zeltner, Swiss botanists, b. 1938, 1934) [Mansion 2004 Taxon 53:719–740] Variable, difficult; further study needed, especially of chromosome numbers, hybridization. Zeltnera calycosa (Buckley) G. Mans. [Centaurium calycosum (Buckley) Fernald] not in California.
Unabridged references: [Mansion & Zeltner 2004 Amer J Bot 91:2069–2086]
1. Pedicels generally 10–70 mm, generally > closed corollas; flower parts generally in 4s ..... Z. exaltata
1' Pedicels 0–40(60) mm, generally < closed corollas (except in some robust plants of Zeltnera venusta); flower parts in 5s
2. Leaves linear to thread-like; stigma 1, ± 2-lobed ..... Z. namophila
2' Leaves ovate or lanceolate to elliptic to oblanceolate or obovate; stigmas 1–2
3. Pedicels of proximal, central flowers 0–10 mm, of other flowers generally 0–5 mm, of distal often 0
4. Corolla lobes 2–7 mm, tips rounded; stigmas 2, wide-fan-shaped ..... Z. muehlenbergii
4' Corolla lobes (3)5–10 mm, tips acute to acuminate; stigma 1, lobes ± 2, wedge-shaped ..... Z. trichantha
3' Pedicels 2–40(60) mm
5. Calyx lobes keeled; corolla lobes 3–7 mm ..... Z. davyi
5' Calyx lobes not keeled; corolla lobes (2)5–20 mm.
6. Main stems from base generally several; basal leaves often rosetted, generally oblanceolate ..... Z. arizonica
6' Main stem from base generally 1; basal leaves 0 or generally not rosetted, narrow-ovate-oblong to lanceolate ..... Z. venusta
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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