Difference between revisions of "Draba arctica"
in G. C. Oeder et al., Fl. Dan. 13(39): plate 5, 2294. 1840.
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{{Treatment/ID | {{Treatment/ID | ||
|accepted_name=Draba arctica | |accepted_name=Draba arctica | ||
| − | |accepted_authority=J. Vahl | + | |accepted_authority=J. Vahl |
|publications={{Treatment/Publication | |publications={{Treatment/Publication | ||
|title=in G. C. Oeder et al., Fl. Dan. | |title=in G. C. Oeder et al., Fl. Dan. | ||
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|basionyms={{Treatment/ID/Basionym | |basionyms={{Treatment/ID/Basionym | ||
|name=Draba ostenfeldii | |name=Draba ostenfeldii | ||
| − | |authority= | + | |authority= |
| + | |rank=species | ||
|publication_title= | |publication_title= | ||
|publication_place=1929 | |publication_place=1929 | ||
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|name=Draba arctica subsp. ostenfeldii | |name=Draba arctica subsp. ostenfeldii | ||
|authority=Böcher ex Kartesz & Gandhi | |authority=Böcher ex Kartesz & Gandhi | ||
| + | |rank=subspecies | ||
}} {{Treatment/ID/Synonym | }} {{Treatment/ID/Synonym | ||
|name=Draba arctica var. ostenfeldii | |name=Draba arctica var. ostenfeldii | ||
|authority=Böcher ex Kartesz & Gandhi | |authority=Böcher ex Kartesz & Gandhi | ||
| + | |rank=variety | ||
}} {{Treatment/ID/Synonym | }} {{Treatment/ID/Synonym | ||
|name=Draba cinerea var. arctica | |name=Draba cinerea var. arctica | ||
|authority=(J. Vahl) Pohle | |authority=(J. Vahl) Pohle | ||
| + | |rank=variety | ||
}} {{Treatment/ID/Synonym | }} {{Treatment/ID/Synonym | ||
|name=Draba ostenfeldii var. ovibovina | |name=Draba ostenfeldii var. ovibovina | ||
|authority=E. Ekman | |authority=E. Ekman | ||
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}} {{Treatment/ID/Synonym | }} {{Treatment/ID/Synonym | ||
|name=Draba ovibovina | |name=Draba ovibovina | ||
| − | |authority= | + | |authority= |
| + | |rank=species | ||
}} | }} | ||
|hierarchy=Brassicaceae;Brassicaceae tribe Arabideae;Draba;Draba arctica | |hierarchy=Brassicaceae;Brassicaceae tribe Arabideae;Draba;Draba arctica | ||
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-->{{#Taxon: | -->{{#Taxon: | ||
name=Draba arctica | name=Draba arctica | ||
| − | + | |authority=J. Vahl | |
| − | |authority=J. Vahl | ||
|rank=species | |rank=species | ||
|parent rank=genus | |parent rank=genus | ||
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|publication year=1840 | |publication year=1840 | ||
|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_368.xml |
|tribe=Brassicaceae tribe Arabideae | |tribe=Brassicaceae tribe Arabideae | ||
|genus=Draba | |genus=Draba | ||
Latest revision as of 23:33, 5 November 2020
Perennials; (cespitose, not pulvinate); caudex simple or branched; rarely scapose. Stems unbranched, 0.3–1.7(–2.4) dm, pubescent, trichomes 4–10-rayed (rays sometimes branched), 0.1–0.3 mm, with fewer, simple ones, to 0.7 mm. Basal leaves rosulate; petiolate; petiole base ciliate, (trichomes simple, 0.2–0.8 mm); blade oblanceolate to narrowly obovate, 0.4–2.3(–3) cm × 1.5–6.5 mm, margins usually entire, rarely with 1 tooth on each side, surfaces densely pubescent with minutely stalked, 8–12-rayed, stellate trichomes, 0.2–0.4 mm, sometimes with coarser, simple or 2-rayed ones, (midvein distinct abaxially). Cauline leaves 0 or 1(–3); sessile; blade ovate or oblong to lanceolate, margins entire, surfaces pubescent as basal. Racemes 3–18(–25)-flowered, ebracteate, elongated in fruit; rachis not flexuous, pubescent as stem. Fruiting pedicels divaricate-ascending or ascending, straight, (1.5–)2–6 mm, pubescent, trichomes stalked, stellate, and, sometimes, simple. Flowers: sepals ovate, 2–2.5 mm, pubescent, (trichomes short-stalked, 2- or 3-rayed, and simple); petals white, spatulate to obovate, 3.5–6 × 1.8–2 mm; anthers ovate, 0.3–0.4 mm. Fruits oblong to lanceolate, plane, slightly flattened, (5–)6–11 × 2–3 mm; valves pubescent, trichomes short-stalked, 2–5-rayed (some rays branched), 0.05–0.3 mm; ovules 20–32 per ovary; style 0.1–1 mm (stigma distinctly wider than style). Seeds ovoid, 0.8–1.1 × (0.6–)0.7–0.8 mm. 2n = 80.
Phenology: Flowering Jun–Jul.
Habitat: Clay flats, gravel, beaches, limestone outcrops, talus
Elevation: 0-500 m
Distribution
Greenland, Nunavut, Europe (Norway [Svalbard]).
Discussion
As circumscribed here, Draba arctica consists of two distinct elements often recognized as subspecies (arctica and ostenfeldii; T. W. Böcher 1966); perhaps they are better treated as distinct species (D. arctica and D. ovibovina). Lack of adequate material and inability to examine all of the types in this complex prevent us from doing so.
Selected References
None.