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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.
Biennial, armed with prickles or spines ± throughout. Stem: erect, generally < 2 m, stout, few-branched, rough-hairy. Leaf: generally < 5 dm, entire or toothed. Inflorescence: generally ± cylindric; involucre bracts unequal, linear, receptacle bract ending in a spine. Flower: calyx limb cup-shaped, persistent; corolla generally lavender (white), tube long, lobes unequal; stamens 4. Fruit: 4-angled, hairy.
± 15 species: Europe, western Asia, Africa. (Greek: thirst, from leaf bases that in some species hold water)
Unabridged references: [Ferguson & Brizicky 1965 J Arnold Arbor 46:362–365]
1. Receptacle bract ending in a straight, ± flexible spine; involucre bract generally erect or upcurved ..... D. fullonum
1' Receptacle bract ending in a recurved, stiff spine; involucre bract generally ± spreading or reflexed ..... D. sativus
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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