Ranunculus turneri
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Ranunculus turneri is a species in the genus buttercup from the family of the Ranunculaceae (Ranunculaceae) with deposits in the Arctic both sides of the Bering Strait (amphiberingisch).
description
The stems are upright, hairy, not bulbous at the base and never root at the nodes , they reach 20 to 40 centimeters in height. The roots are never bulbous. The leaf blades of the basal leaves are 1.3 to 3 × 1.8 to 3.8 centimeters in size, heart-shaped to kidney-shaped and in three parts. The sections are split. The last section is elliptical to lanceolate. The leaf margin is serrated, the end of the leaf pointed.
The prescription is hairless. The sepals are 7 to 9 × 2 to 4 millimeters in size, spread out and wire-haired. The 5 petals are 10 to 15 × 8 to 11 millimeters in size and yellow. The head of the achenes is 7 to 10 millimeters in size and almost spherical. The achenes are 2.4 × 2.6 to 2.7 millimeters in size and hairless. The edge of the achenes forms a narrow, 0.1 to 0.2 millimeter wide rib. The beak is 1.6 to 2 millimeters long, lanceolate, strongly hooked or curved and persistent.
The flowering time is in summer (August).
The number of chromosomes is 2n = 28.
Similar species
Similar, upright Crowfoot species in northwestern North America are Ranununculs sceleratus var. Multifidus and Ranunculus pedatifidus var. Affinis . The sharp buttercup ( Ranunculus acris ) (which only occurs neophytically in the area of Ranunculus turneri ) is similar both morphologically and in terms of its ecological requirements.
Occurrence
Ranunculus turneri occurs in Canada in the Yukon and the Northwest Territories, in Alaska and in Asia. Ten occurrences are known from Alaska. The species grows from sea level to 1,400 meters in the mountains. It occurs on river banks, in moist, meadow-like habitats and in " snow valleys" soaked by thawing snow , mostly in flat to slightly sloping locations, and prefers basic to neutral soils. Common companion species in Alaska are Artemisia tilesii , Arctagrostis latifolia , Cardamine blaisdellii , Carex nesophila , Festuca altaica , Polemonium acutifolium , Primula pumila .
Systematics
Ranunculus turneri was first described by Edward Lee Greene in 1892 . A synonym is Ranunculus occidentalis Nuttall var. Turneri (Greene) LD Benson .
There are two subspecies:
- Ranunculus turneri subsp. turneri R.Br. : North America, Northeast Siberia
- Ranunculus turneri subsp. jacuticus (Ovcz.) Tolm. : Northeast Siberia
literature
- Alan T. Whittemore: Ranunculus turneri . In: Flora of North America. Vol. 3 . on-line
- Matthew L. Carlson: Ranunculus turneri ssp. turneri at Alaska Natural Heritage Program (AKNHP): Rare Plant Species Information. PDF
Individual evidence
- ^ Ranunculus turneri at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
- ^ Reidar Elven (editor-in-chief): Annotated Checklist of the Panarctic Flora (PAF) Vascular plants
Web links
- Distribution map of Ranunculus turneri in the Flora of North America