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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.

 

TONESTUS

Lowell E. Urbatsch


Perennial herb from taproot, branched caudex, or short rhizome, glandular, sometimes mat-forming. Stem: erect, unbranched, glabrous or stalked-glandular, sometimes with withered, persistent leaf bases. Leaf: basal and cauline, alternate, basal persistent, cauline reduced distally, oblanceolate, 1–3-veined, generally stalked-glandular. Inflorescence: heads radiate, 1–4 per stem in open cluster; involucre bell-shaped; phyllaries in 3–4 ± equal series, lanceolate, 1-veined, outer grading into distal leaves; receptacle convex, pitted, epaleate. Ray flower: 10–25; ray <= 12 mm, yellow. Disk flower: 25–65; corolla flaring slightly, yellow; anther tip slender, acute, appendage length 2–4 × width; style tips acute, appendage ± equal or > stigmatic portion. Fruit: narrowly oblong to linear, ± cylindric, fusiform, or compressed, glabrous or hairy; pappus of many ± white bristles in 1 series.
± 4–5 species: western North America. (Anagram of Stenotus) [Morse 2006 FNANM 20:181–184; Nesom & Morgan 1990 Phytologia 68:174–180]
Unabridged references: [Urbatsch et al. 2006 FNANM 20:177–181]

Key to Tonestus

1. Leaves entire; fruit glabrous or sparsely hairy ..... T. lyallii

1' Leaves ± toothed; fruit hairy

2. Involucre 7.5–16 mm; ray flowers 10–13; disk corollas 5.5–7.5 (8.2) mm ..... T. eximius

2' Involucre 14–28 mm; ray flowers 16–20; disk corollas 7.5–10.5 mm ..... T. peirsonii

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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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