|University of California, Berkeley|
|Jepson eFlora: Taxon page
Key to families | Table of families and genera
Index to accepted names and synonyms:
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|Family: Brassicaceae (Cruciferae)||View Description||Dichotomous Key|
|Genus: Isatis||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Isatis tinctoria L.
Habit: Biennial, glaucous, glabrous or hairy proximally. Stem: (3)4--10(15) dm, branched distally. Leaf: basal (3)6--20(25) cm, oblong to oblanceolate, entire to wavy or dentate; cauline entire. Inflorescence: panicle of racemes. Flower: sepals 1.5--2.8 mm; petals 2.5--4 mm, 0.9--1.5 mm wide, oblanceolate, yellow. Fruit: (0.9)1.1--2(2.7) cm, 3--6(10) mm wide, oblong-oblanceolate to elliptic-obovate; pedicel reflexed, 5--10 mm, club-shaped near tip. Seed: 2.3--3.5(4.5) mm, oblong. Chromosomes: 2n=14,28.
Ecology: Disturbed areas, pastures; Elevation: 100--2200 m. Bioregional Distribution: KR, CaR, n SNH, MP; Distribution Outside California: western and eastern North America, native to Eurasia. Flowering Time: Apr--Jul Note: Once cultivated as source of the blue dye woad.
eFlora Treatment Author: Ihsan A. Al-Shehbaz
Jepson Online Interchange
Previous taxon: Isatis
Next taxon: Lepidium
Citation for this treatment: Ihsan A. Al-Shehbaz 2017. Isatis tinctoria, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=29342, accessed on February 22, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 22, 2017.