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Compilation
Draba micropetala

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Draba micropetala Hook. [family BRASSICACEAE]
Draba micropetala Hook. [family BRASSICACEAE]
Draba micropetala Hook. [family BRASSICACEAE]
Isotype of Draba micropetala Hook. [family CRUCIFERAE]
Draba micropetala Hook. [family BRASSICACEAE]
Draba micropetala Hook. [family BRASSICACEAE]
Draba micropetala Hook. [family BRASSICACEAE]
Draba micropetala Hook. [family BRASSICACEAE]
Draba micropetala Hook. [family BRASSICACEAE]
Draba micropetala Hook. [family BRASSICACEAE]
Draba micropetala Hook. [family BRASSICACEAE]
Holotype of Draba pauciflora R.Br. var. franklinii O.E.Schulz [family BRASSICACEAE]
Draba micropetala Hook. [family BRASSICACEAE]
Draba micropetala Hook. [family BRASSICACEAE]
Draba micropetala Hook. [family BRASSICACEAE]
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Name

Identification
Isotype of Draba micropetala Hook. [family CRUCIFERAE ] (stored under name); Verified by Not on sheet,
Related name
  • Draba aurea
  • Draba rupestris
  • Draba micropetala
  • Draba hirta
  • Draba glacialis
  • Draba daurica
  • Draba pauciflora
  • Draba groenlandica
  • Draba wahlenbergii
  • Draba subcapitata

Flora

Entry for Draba micropetala Hooker [family CRUCIFERAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 7,
Names
Draba micropetala Hooker [family CRUCIFERAE], in W. E. Parry, App. Parry J. Sec. Voy., 385. 1825
Draba alpina Linnaeus var. micropetala Durand [family CRUCIFERAE]
Draba oblongata R. Brown ex de Candolle subsp. minuta V. V. Petrovsky [family CRUCIFERAE]
Draba pauciflora R. Brown var. micropetala (Hooker) O. E. Schulz [family CRUCIFERAE]
Treatment Author(s)
Ihsan A. Al-Shehbaz
Michael D. Windham
Reidar Elven
Information
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
jun-jul (summer)
Altitude range
0–900 m;
Distribution
GreenlandEurope (Norway [Spitsbergen])e Asia (Russian Far East).e Asia (Siberia).USA AlaskaCanada N.W.T.Canada Nunavut
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.

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