Isatis

Isatis
Isatis tinctoria
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Embryophytes
Clade: Tracheophytes
Clade: Spermatophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Brassicales
Family: Brassicaceae
Genus: Isatis
L.
Species

About 30 species, including:
Isatis boissieriana
Isatis glauca
Isatis tinctoria
others (see text)

Synonyms[1]
List
    • Boreava Jaub. & Spach
    • Martinsia Godr.
    • Pachypteris Kar. & Kir.
    • Pachypterygium Bunge
    • Sameraria Desv.
    • Tauscheria Fisch. ex DC.
    • Tetrapterygium Fisch. & C.A.Mey.

Isatis is a genus of flowering plants in the family Brassicaceae, native to the Mediterranean region east to central Asia. Its genus name, Isatis, derives from the ancient Greek word for the plant, ἰσάτις. The genus includes woad (Isatis tinctoria). Due to their extremely variable morphology, the Asian species in particular are difficult to determine; the only reliable diagnostic feature is the ripe fruit. They are (usually) biennial or perennial herbaceous plants, often bluish and hairless or downy hairy with the upright stem branched.[2]

Description

They are annual, biennial or perennial, branched herbs, usually glabrous and glaucous except silique. Basal leaves generally elliptic-oblong, sessile; sessile caulinary, rounded to oval-oblong.

The hermaphrodite flowers are fourfold double perianth. The four sepals are ascending to upright. The four yellow to off-white or lilac-white petals are at least as long as the sepals. They have six stamens with very small, egg-shaped or elongated-round anthers. There are nectar glands. Racemose is branched or paniculated, ebracted, inflorescence, often reaching lax and elongated in the fruit.

The fruit is a generally linear silique, oblong-cuneate to suborbicular, indehiscent, flattened laterally, unilocular, little to conspicuously winged, glabrous or with tiny hairs.[3]

Species

Currently accepted species include:[1]

References

  1. ^ a b "Isatis Tourn. ex L." Plants of the World Online. Board of Trustees of the Royal Botanic Gardens, Kew. 2017. Retrieved 13 August 2020.
  2. ^ H. Moazzeni et al .: Phylogeny of Isatis (Brassicaceae) and allied genera based on ITS sequences of nuclear ribosomal DNA and morphological characters. In: Flora (Elsevier), Volume 205, 2010, pp. 337–343.
  3. ^ Flora of North America Editorial Committee, e. 2010. Magnoliophyta: Salicaceae to Brassicaceae. Fl. N. Amer. 7: i – xxii, 1–797.
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