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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.

 

TETRAPTERON
Annual, stem 0, from taproot. Leaf: mostly basal, or cauline on short stems, alternate, broadly sessile or clasping. Inflorescence: flowers 1 in axils of rosette, nodding in bud. Flower: opening at dawn; sepals 4, reflexed in pairs; petals 4, yellow, unspotted, strongly ultraviolet-reflective, fading red-orange; longer stamens opposite sepals, anthers attached near base, pollen grains 3-angled; ovary tip with sterile 0.4–18 cm projection that often breaks off in fruit, with clear abscission line at juncture between short hypanthium and fertile part of ovary, stigma hemispheric, ± = anthers and generally self-pollinated (or > anthers and cross-pollinating). Fruit: irregularly obovoid, sharply 4-angled with pointed wing near center top of each valve, ± sessile, very tardily dehiscent in distal 1/2 only, thick-walled (not distended by seeds), persistent for > 1 year, sessile. Seed: in 2 crowded rows per chamber, obovoid to narrowly obovoid, finely papillate or deeply pitted, tan or brown with dark patches.
2 species: California, disjunct in northwestern Nevada, southern Oregon, northern Baja California. (Greek: four winged) [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 Tetrapteron

1. Leaf linear to narrowly lanceolate or oblanceolate; petals 5–18 mm; hypanthium 1.6–3.2 mm; plant densely spreading-hairy ..... T. graciliflorum

1' Leaf narrowly oblanceolate; petals 2–3.5 mm; hypanthium 0.8–1.3 mm; plant strigose and sparsely spreading-hairy ..... T. palmeri

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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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