Difference between revisions of "Draba micropetala"
in W. E. Parry, App. Parry J. Sec. Voy., 385. 1825.
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{{Treatment/ID | {{Treatment/ID | ||
|accepted_name=Draba micropetala | |accepted_name=Draba micropetala | ||
| − | |accepted_authority=Hooker | + | |accepted_authority=Hooker |
|publications={{Treatment/Publication | |publications={{Treatment/Publication | ||
|title=in W. E. Parry, App. Parry J. Sec. Voy., | |title=in W. E. Parry, App. Parry J. Sec. Voy., | ||
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|name=Draba alpina var. micropetala | |name=Draba alpina var. micropetala | ||
|authority=Durand | |authority=Durand | ||
| − | }}{{Treatment/ID/Synonym | + | |rank=variety |
| + | }} {{Treatment/ID/Synonym | ||
|name=Draba oblongata subsp. minuta | |name=Draba oblongata subsp. minuta | ||
|authority=V. V. Petrovsky | |authority=V. V. Petrovsky | ||
| − | }}{{Treatment/ID/Synonym | + | |rank=subspecies |
| + | }} {{Treatment/ID/Synonym | ||
|name=Draba pauciflora var. micropetala | |name=Draba pauciflora var. micropetala | ||
|authority=(Hooker) O. E. Schulz | |authority=(Hooker) O. E. Schulz | ||
| + | |rank=variety | ||
}} | }} | ||
|hierarchy=Brassicaceae;Brassicaceae tribe Arabideae;Draba;Draba micropetala | |hierarchy=Brassicaceae;Brassicaceae tribe Arabideae;Draba;Draba micropetala | ||
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|elevation=0-900 m | |elevation=0-900 m | ||
|distribution=Greenland;N.W.T.;Nunavut;Alaska;Europe (Norway [Spitsbergen]);e Asia (Russian Far East;Siberia). | |distribution=Greenland;N.W.T.;Nunavut;Alaska;Europe (Norway [Spitsbergen]);e Asia (Russian Far East;Siberia). | ||
| − | |discussion=<p>Draba micropetala, which was not listed by C. L. Hitchcock (1941) or R. C. Rollins (1993), is frequently confused with the closely related tetraploid (2n = 32) D. pauciflora. It is distinguished from the latter by having elongated (versus congested) fruiting racemes, narrower [2–3.2 versus (3–)3.5–5 mm] and elliptic-ovate (versus obovate) fruits, more [(16–)18–28 versus 8–16(–20)] seeds per fruit, and obtuse to rounded (versus subacute to acute) leaf apices with multibranched, subcruciform (versus simple and/or 2-branched) trichomes.</p> | + | |discussion=<p><i>Draba micropetala</i>, which was not listed by C. L. Hitchcock (1941) or R. C. Rollins (1993), is frequently confused with the closely related tetraploid (2n = 32) <i>D. pauciflora</i>. It is distinguished from the latter by having elongated (versus congested) fruiting racemes, narrower [2–3.2 versus (3–)3.5–5 mm] and elliptic-ovate (versus obovate) fruits, more [(16–)18–28 versus 8–16(–20)] seeds per fruit, and obtuse to rounded (versus subacute to acute) leaf apices with multibranched, subcruciform (versus simple and/or 2-branched) trichomes.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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-->{{#Taxon: | -->{{#Taxon: | ||
name=Draba micropetala | name=Draba micropetala | ||
| − | + | |authority=Hooker | |
| − | |authority=Hooker | ||
|rank=species | |rank=species | ||
|parent rank=genus | |parent rank=genus | ||
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|publication year=1825 | |publication year=1825 | ||
|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_428.xml |
|tribe=Brassicaceae tribe Arabideae | |tribe=Brassicaceae tribe Arabideae | ||
|genus=Draba | |genus=Draba | ||
Latest revision as of 22:33, 5 November 2020
Perennials; caudex branched (with persistent leaf remains); scapose. Stems unbranched, (0.05–)0.15–0.7(–1.1) dm, pubescent throughout, sometimes sparsely so distally, trichomes stalked, 2–4-rayed, and simple, 0.05–0.6 mm. Basal leaves (not imbricate); rosulate; petiolate; petiole (base thickened), margin ciliate, (trichomes coarse, simple and 2-rayed, 0.3–1.3 mm); blade broadly oblanceolate to broadly obovate, 0.6–2 cm × 4–12 mm, margins entire, (apex obtuse to rounded, trichomes multibranched, subcruciform), surfaces pubescent abaxially with stalked, 2–4-rayed and, rarely, simple trichomes, 0.1–0.6 mm, adaxially glabrous or with mostly simple trichomes. Cauline leaves 0. Racemes 2–7(–10)-flowered, ebracteate, often elongated in fruit; rachis often flexuous, pubescent as stem. Fruiting pedicels divaricate to ascending, straight, 1–3(–4) mm, pubescent as stem. Flowers: sepals oblong, 1.8–2.5 mm, pubescent, (trichomes simple, with short-stalked, 2-rayed ones); petals pale yellow, narrowly spatulate or oblanceolate, 2–3 × (0.7–)1–1.5 mm; anthers ovate, 0.3–0.4 mm. Fruits elliptic-ovate, plane, slightly flattened, 5–10 × 2–3.2 mm; valves often densely pubescent, trichomes simple and spurred, 0.1–0.5 mm; ovules (16–)18–28 per ovary; style 0.05–0.3 mm (stigma about as wide as style). Seeds oblong, 1–1.1 × 0.5–0.6 mm. 2n = 48.
Phenology: Flowering Jun–Jul.
Habitat: Meadows, mesic tundra, swales, gravelly soils
Elevation: 0-900 m
Distribution
Greenland, N.W.T., Nunavut, Alaska, Europe (Norway [Spitsbergen]), e Asia (Russian Far East, Siberia).
Discussion
Draba micropetala, which was not listed by C. L. Hitchcock (1941) or R. C. Rollins (1993), is frequently confused with the closely related tetraploid (2n = 32) D. pauciflora. It is distinguished from the latter by having elongated (versus congested) fruiting racemes, narrower [2–3.2 versus (3–)3.5–5 mm] and elliptic-ovate (versus obovate) fruits, more [(16–)18–28 versus 8–16(–20)] seeds per fruit, and obtuse to rounded (versus subacute to acute) leaf apices with multibranched, subcruciform (versus simple and/or 2-branched) trichomes.
Selected References
None.