Isatis

Linnaeus

Sp. Pl. 2: 670. 1753.

,

Gen. Pl. ed. 5, 301. 1754.

Common names: Woad
Etymology: Greek isatis, name used for a dye plant, most likely woad
Treatment appears in FNA Volume 7. Treatment on page 567. Mentioned on page 230, 239, 244.
 TaxonIllustrator 
FNA7 P70 Teesdalia nudicaulis.jpegTeesdalia nudicaulis
Idahoa scapigera
Isatis tinctoria
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey
Barbara Alongi

Biennials [annuals, perennials]; not scapose; (often glaucous), glabrous or pubescent. Stems erect, often unbranched basally, paniculately branched distally. Leaves basal and cauline; petiolate or sessile; basal rosulate [or not rosulate], petiolate [rarely sessile], blade margins entire, repand, or dentate [rarely pinnately lobed]; cauline blade (base auriculate, sagittate, [or amplexicaul, rarely attenuate]), margins entire [dentate]. Racemes (corymbose, in panicles, several-flowered), considerably elongated in fruit. Fruiting pedicels reflexed, slender, (filiform, often thickened and clavate apically). Flowers: sepals erect or ascending, oblong [ovate]; petals oblanceolate [obovate, spatulate, or oblong], (equal to or longer than sepals), claw absent, (apex obtuse [subemarginate]); stamens slightly tetradynamous; filaments not dilated basally; anthers oblong [ovate], (apex obtuse or apiculate); nectar glands (6) confluent, or (4) lateral and median. Fruits siliques or silicles (samaroid), sessile, oblong, oblanceolate, elliptic, or obovate [ovate, cordate, spatulate, orbicular], 1- (or 2-) seeded, smooth, strongly angustiseptate, (prominently winged all around or distally; seed-bearing locule papery or corky, distinctly or obscurely 1–3-veined, sometimes keeled or shortly winged), glabrous or pubescent; valves and replum united; septum absent; ovules 1 (or 2) per ovary, (subapical); stigma capitate. Seeds plump, not winged, narrowly oblong; seed-coat (smooth), not mucilaginous when wetted; cotyledons incumbent or accumbent.

Distribution

Introduced; Europe, c, sw Asia, n Africa, also in South America (Chile), also in South America (Peru)

Discussion

Species 50 (1 in the flora).

Selected References

None.

Lower Taxa

"elongated" is not a number."thick" is not a number.

... more about "Isatis"
Ihsan A. Al-Shehbaz +
Linnaeus +
appendaged +  and unappendaged +
dentate +, repand +  and entire +
much smaller +  and reduced +
urceolate +, campanulate +  and tubular +
branched +  and simple +
well-developed +
not +  and differentiated +
emarginate +  and entire +
accumbent +  and incumbent +
Europe +, c +, sw Asia +, n Africa +, also in South America (Chile) +  and also in South America (Peru) +
straight +  and curved +
Greek isatis, name used for a dye plant, most likely woad +
not winged +  and unappendaged +
connate +  and distinct +
actinomorphic +
1-seeded +  and sessile +
indehiscent +
pubescent +  and glabrous +
angustiseptate +, obovate +, elliptic +, oblanceolate +  and oblong +
sessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
pinnatifid +
median +  and lateral +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
rudimentary +
oblanceolate +
trinucleate +  and 3(-11)-colpate +
Sp. Pl. +  and Gen. Pl. ed. +
1753 +  and 1754 +
slender +
flattened +  and rounded +
mucilaginous +
not +  and mucilaginous +
white +, black +, brown +  and yellow +
saccate +  and not saccate +
persistent +  and caducous +
distinct +
ascending +  and erect +
perforated +  and complete +
reduced +
1-seeded +  and sessile +
pubescent +  and glabrous +
angustiseptate +, obovate +, elliptic +, oblanceolate +  and oblong +
1-seeded +  and sessile +
pubescent +  and glabrous +
angustiseptate +, obovate +, elliptic +, oblanceolate +  and oblong +
tetradynamous +
branched +  and unbranched +
procumbent +  and decumbent +
2-lobed +, entire +, conical +  and capitate +
subsessile +, sessile +  and petiolate +
persistent +
distinct +
Cruciferae +
Brassicaceae tribe Isatideae +
scale-like +  and forked +
coiled +, 1-7-veined +  and veined +
pubescent +  and glabrous +
anastomosing +
pubescent +  and glabrous +
rhizomatous +, taprooted +, scapose +  and not +
perennial +, biennial +  and annual +
subshrub +  and herb +
aquatics +  and terrestrial +
glabrous +  and pubescent +