Ranunculus austro-oreganus
| Ranunculus austro-oreganus | ||||||||||||
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| Scientific name | ||||||||||||
| Ranunculus austro-oreganus | ||||||||||||
| LD Benson |
Ranunculus austro-oreganus is a species of the buttercup family.
description
The stems are erect or ascending, have wavy hairs, do not root at the nodes and their base is not onion-like. The roots are never tubular. The leaf blade of the basal leaves is 2.8 to 4.3 × 3 to 5.5 inches in size, broadly rhombic to semicircular in outline and in three parts. Each of the 3 segments is three-lobed. The terminal segment is lanceolate, entire or toothed and has a narrow, pointed to pointed tip. The prescription is hairless. The sepals are 4 to 6 × 1.5 to 3 millimeters in size, bent one millimeter above their base and slightly hairy. The 5 petals are 10 to 12 × 4 to 6 millimeters in size, yellow on the top and red on the underside. The head of the achenes is 4 to 7 × 7 to 10 millimeters in size and hemispherical. The achenes are 3.4 to 4.2 × 2.8 to 3.2 millimeters in size and sometimes hairy at the base. Its edge forms a narrow rib 0.1 to 0.2 millimeters wide. The beak is 1.6 to 2.6 millimeters long, permanent, lanceolate-subulate, straight or slightly curved towards the tip.
The species blooms in May.
Occurrence
The species occurs only on grassy slopes in southwest Oregon at altitudes of 500 meters.
Systematics
Ranunculus austro-oreganus was first described by Lyman David Benson in 1954 . It is doubtful whether the taxon is different from Ranunculus occidentalis var. Howellii .
supporting documents
- Alan T. Whittemore: Ranunculus austro-oreganus . In: Flora of North America. Vol. 3 . on-line
Web links
- Distribution map of Ranunculus austro-oreganus in the Flora of North America