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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 or perennial herb, 3–30 cm, often mound-shaped; odor turpentine-like. Stem: erect or spreading, generally much-branched. Leaf: basal and cauline, alternate, petioled; blades ± rounded to reniform, entire to toothed, gray or gray-green, generally scaly- or soft-hairy to ± woolly, glandular. Inflorescence: heads discoid, 1; involucre 3–6+ mm diam, bell-shaped or obconic [cylindric]; phyllaries 8–24 in 2 contrasting series, free, ± lanceolate, obovate, or spoon-shaped, deciduous or persistent, tips erect or spreading to reflexed; receptacle flat to convex, smooth or ± pitted, epaleate. Disk flower: 9–32; corolla ± yellow, tube << cylindric throat, lobes erect, deltate; anther tip ± lanceolate to ovate; style branches rounded-truncate at tip. Fruit: ± cylindric or spindle-shaped to obpyramidal; pappus of 35–150 bristles in 1–4 series, free or basally fused.
3 species: southwestern United States, northwestern Mexico. (Greek: brittle) [Strother 2006 FNANM 21:416–418]
Unabridged references: [Baldwin & Wessa 2000 Syst Bot 25:522–538]
1. Outer phyllaries linear to ± lanceolate, tips generally erect, like inner; pappus bristles 35–50; flowers 10–20; plant sparsely scaly-hairy ..... P. annua
1' Outer phyllaries spoon-shaped to obovate, tips spreading to reflexed; pappus bristles 120–140; flowers 16–32; plant densely scaly-hairy to ± woolly ..... P. ramosissima
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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