Difference between revisions of "Hirschfeldia"
Methodus, 264. 1794.
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|distribution=Eurasia;nw Africa;introduced also in South America;s Africa;Atlantic Islands;Pacific Islands (Hawaii);Australia. | |distribution=Eurasia;nw Africa;introduced also in South America;s Africa;Atlantic Islands;Pacific Islands (Hawaii);Australia. | ||
| + | |introduced=true | ||
|discussion=<p>Species 1.</p><!-- | |discussion=<p>Species 1.</p><!-- | ||
--><p>It is with some hesitation that I recognize this genus; it should perhaps be united with <i>Erucastrum</i>, as recently proposed for conservation by I. A. Al-Shehbaz (2005b). As clearly shown by S. I. Warwick and L. D. Black (1993), <i>Brassica</i>, <i>Diplotaxis</i>, and <i>Erucastrum</i> are artificially delimited genera, and a substantial revision of their boundaries is needed.</p> | --><p>It is with some hesitation that I recognize this genus; it should perhaps be united with <i>Erucastrum</i>, as recently proposed for conservation by I. A. Al-Shehbaz (2005b). As clearly shown by S. I. Warwick and L. D. Black (1993), <i>Brassica</i>, <i>Diplotaxis</i>, and <i>Erucastrum</i> are artificially delimited genera, and a substantial revision of their boundaries is needed.</p> | ||
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|publication year=1794 | |publication year=1794 | ||
|special status= | |special status= | ||
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V7/V7_657.xml |
|tribe=Brassicaceae tribe Brassiceae | |tribe=Brassicaceae tribe Brassiceae | ||
|genus=Hirschfeldia | |genus=Hirschfeldia | ||
Latest revision as of 22:35, 5 November 2020
Annual or biennials; not scapose; pubescent. Stems (simple or several from base), erect, branched basally and distally. Leaves basal and cauline; petiolate or subsessile; basal rosulate, petiolate, blade lyrate to pinnatifid, margins crenate-dentate; cauline subsessile or petiolate, blade (base not auriculate), margins dentate or pinnatifid. Racemes (corymbose, several-flowered), considerably elongated in fruit. Fruiting pedicels erect, stout. Flowers: sepals widely spreading or reflexed, oblong, lateral pair not saccate basally; petals yellow, obovate to spatulate, claw differentiated from blade, (apex obtuse); stamens tetradynamous; filaments not dilated basally; anthers oblong or ovate, (apex obtuse); nectar glands not confluent, median glands present. Fruits siliques, dehiscent, sessile, segments 2, linear, slightly torulose, terete or slightly 4-angled; (proximal segment not torulose, somewhat corky at maturity, 8–20-seeded; terminal segment indehiscent, 1- or 2-seeded, slightly swollen apically); valves 3(–7)-veined, usually glabrous, rarely sparsely pubescent; replum rounded; septum complete; ovules 10–22 per ovary; (style present); stigma capitate, entire. Seeds uniseriate, plump, not winged, globose; seed coat (smooth to finely reticulate), mucilaginous when wetted; cotyledons conduplicate. x = 7.
Distribution
Introduced; Eurasia, nw Africa, introduced also in South America, s Africa, Atlantic Islands, Pacific Islands (Hawaii), Australia.
Discussion
Species 1.
It is with some hesitation that I recognize this genus; it should perhaps be united with Erucastrum, as recently proposed for conservation by I. A. Al-Shehbaz (2005b). As clearly shown by S. I. Warwick and L. D. Black (1993), Brassica, Diplotaxis, and Erucastrum are artificially delimited genera, and a substantial revision of their boundaries is needed.
Selected References
None.