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Key to families | Table of families and genera
This text currently parallels The Jepson Manual: Vascular Plants of California, Second Edition that is now available at the University of California Press.
Text appearing in blue on this page will not appear in the printed book; it will be displayed only on the Web. 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, perennial herb, subshrub, from taproot or ± branched caudex.
Leaf: simple, alternate, entire to deeply 1–2-pinnately lobed, teeth or lobes bristle-tipped, distal reduced.
Inflorescence: heads radiate [discoid], 1 or in cyme-like clusters; involucre hemispheric [obconic, bell-shaped]; phyllaries graduated in 2–8 series, proximally straw-colored, distally generally green, bristle-tipped; receptacle flat to convex, with short, triangular scales, glabrous, epaleate.
Ray flower: 8–many; corolla yellow [white, pink, blue, or purple].
Disk flower: 10–many; corolla yellow; anther tip lanceolate; style tips triangular to linear.
Fruit: elliptic, oblong, or obovoid, several- to many-ribbed, sparsely to densely hairy; pappus of many unequal bristles ( ray pappus occasionally 0).
17 species: temperate w North America. (Greek: yellow condition, describing flower heads of original sp.) [Hartman 2006 FNANM 20:383–393]
Unabridged references: [Morgan & Hartman 2003 Sida 20:1387–1416]
1. Annual ..... X. gracile
1' Perennial or subshrub
2. Distal bracts of peduncle overlapping, grading into phyllaries; stem nearly leafless above base ..... X. junceum
2' Distal bracts of peduncle few, well separated, not grading into phyllaries; stem generally leafy, at least in proximal 1/2 ..... X. spinulosum var. gooddingii
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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