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Isatis
Family: Brassicaceae
Isatis image
Mary Barkworth
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Ihsan A. Al-Shehbaz in Flora of North America (vol. 7)
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.
Vascular plants of NE US and adjacent Canada
Sep divergent, somewhat unequal; pet yellow, narrowly obovate, exceeding the sep; short stamens flanked and subtended by a pair of confluent glands; each pair of long stamens subtended by a single gland; ovary flat, with a single locule and ovule; stigma sessile, 2-lobed; fr indehiscent and somewhat samaroid, compressed contrary to the normal position of the replum, with strongly flattened valves; seed single and median, replacing the replum; herbs, usually tall, with leafy, branching stems. 60, Eurasia, n. Afr.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
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Isatis costata
Image of Isatis costata
Isatis lusitanica
Images
not available
Isatis microcarpa
Image of Isatis microcarpa
Isatis quadrialata
Image of Isatis quadrialata
Isatis tinctoria
Image of Isatis tinctoria
The National Science Foundation
Development supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)
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