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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.


Perennial herb to shrub. Stem: generally ± white, glabrous or hairy. Leaf: all cauline, alternate, entire or toothed; midrib white. Inflorescence: heads radiate, 1, sessile or peduncled; involucre bell-shaped or hemispheric; phyllaries graduated in 3–6 series; receptacle convex, epaleate. Ray flower: generally 12–60; corolla white to blue or purple. Disk flower: 30–140; corolla yellow; style tips linear, acute. Fruit: linear to club-shaped, weakly compressed, 4-ribbed, with long, ± appressed hairs; pappus of 30–45, unequal, barbed bristles.
10 species: western North America. (Greek: woody root) [Nesom 2006 FNANM 20:406–409]
Unabridged references: [Watson 1977 Brittonia 29:199–216]

Key to Xylorhiza

1. Perennial herb or subshrub; stem generally branched only in proximal 1/2; peduncle 8–25 cm ..... X. tortifolia var. tortifolia

1' Shrub; stem generally branched throughout; peduncle 0–11 cm

2. Younger stems and peduncles short-glandular; phyllaries loosely appressed, outermost glandular, innermost < immediately preceding series ..... X. cognata

2' Younger stems and peduncles generally glabrous (rarely puberulent proximal to heads); phyllaries tightly appressed, ± glabrous; innermost >= immediately preceding series ..... X. orcuttii


Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, [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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