Difference between revisions of "Draba stenopetala"
Trudy Imp. S.-Petersburgsk. Bot. Sada 6: 11. 1879.
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|name=Draba stenopetala var. purpurea | |name=Draba stenopetala var. purpurea | ||
|authority=Hultén | |authority=Hultén | ||
| + | |rank=variety | ||
}} | }} | ||
|hierarchy=Brassicaceae;Brassicaceae tribe Arabideae;Draba;Draba stenopetala | |hierarchy=Brassicaceae;Brassicaceae tribe Arabideae;Draba;Draba stenopetala | ||
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|elevation=100-1900 m | |elevation=100-1900 m | ||
|distribution=Yukon;Alaska;e Asia (Russian Far East). | |distribution=Yukon;Alaska;e Asia (Russian Far East). | ||
| − | |discussion=<p>Different chromosome counts for Draba stenopetala were reported as 2n = 24 from North America and 2n = 64 from the Russian Far East (S. I. Warwick and I. A. Al-Shehbaz 2006). It is unlikely that a single species is involved, and further work is needed to verify the counts from North America.</p> | + | |discussion=<p>Different chromosome counts for <i>Draba stenopetala</i> were reported as 2n = 24 from North America and 2n = 64 from the Russian Far East (S. I. Warwick and I. A. Al-Shehbaz 2006). It is unlikely that a single species is involved, and further work is needed to verify the counts from North America.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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-->{{#Taxon: | -->{{#Taxon: | ||
name=Draba stenopetala | name=Draba stenopetala | ||
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|authority=Trautvetter | |authority=Trautvetter | ||
|rank=species | |rank=species | ||
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|publication year=1879 | |publication year=1879 | ||
|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_475.xml |
|tribe=Brassicaceae tribe Arabideae | |tribe=Brassicaceae tribe Arabideae | ||
|genus=Draba | |genus=Draba | ||
Latest revision as of 23:33, 5 November 2020
Perennials; (pulvinate); caudex branched (covered with persistent leaves, branches sometimes terminating in sterile rosettes); scapose. Stems unbranched, (0.02–)0.07–0.2(–0.3) dm, pubescent throughout, trichomes simple and short-stalked, 2–5-rayed, 0.1–0.5 mm, (sometimes simple ones very sparse). Basal leaves (densely imbricate); rosulate; petiolate; petiole base and margin ciliate, (trichomes simple and 2-rayed, 0.2–0.5 mm); blade obovate to oblong-spatulate, 0.2–0.6(–0.8) cm × 1–2(–3) mm, margins entire, surfaces often pubescent with simple and stalked, 2–5-rayed trichomes, 0.2–0.9 mm, sometimes glabrous and trichomes on margins only. Cauline leaves 0. Racemes 2–5-flowered, ebracteate, not or slightly elongated in fruit; rachis slightly flexuous, pubescent as stem. Fruiting pedicels divaricate, straight, 2–5(–7) mm, pubescent as stem. Flowers: sepals (spreading or reflexed), oblong, 2–3.5 mm, pubescent, (trichomes simple and 2-rayed); petals yellow or purple, linear, 2.5–5 × 0.3–0.7 mm; anthers ovate, 0.3–0.4 mm. Fruits suborbicular, plane, inflated basally, flattened distally, 3–5 × 3–4 mm; valves glabrous or puberulent, trichomes simple, 0.02–0.3 mm; ovules 4–10 per ovary; style 0.2–0.6 mm. Seeds ovoid, 1–1.3 × 0.8–1 mm. 2n = 24, 64.
Phenology: Flowering May–Jul.
Habitat: Rock outcrops, talus, rocky ridges, alpine tundra
Elevation: 100-1900 m
Distribution
Yukon, Alaska, e Asia (Russian Far East).
Discussion
Different chromosome counts for Draba stenopetala were reported as 2n = 24 from North America and 2n = 64 from the Russian Far East (S. I. Warwick and I. A. Al-Shehbaz 2006). It is unlikely that a single species is involved, and further work is needed to verify the counts from North America.
Selected References
None.