Ranunculus canus

from Wikipedia, the free encyclopedia
Ranunculus canus
Systematics
Order : Buttercups (Ranunculales)
Family : Buttercup Family (Ranunculaceae)
Subfamily : Ranunculoideae
Tribe : Ranunculeae
Genre : Buttercup ( Ranunculus )
Type : Ranunculus canus
Scientific name
Ranunculus canus
Benth.

Ranunculus canus is a species of the genus buttercup ( Ranunculus ) within the buttercup family(Ranunculaceae).

description

The stems are erect or lying, wire-haired, finely hairy or hairless, not bulbous at the base and do not form roots at the nodes . The roots are not knotty. The leaf blade of the basal leaves is 3.3 to 9.5 × 3.5 to 9.4 centimeters in size, ovate to narrowly ovate and three-part or consisting of three leaflets. The leaflets or sections of the basal leaves are one to three-lobed. The end sections are egg-shaped or oblong-egg-shaped. The leaf margins are serrated, the tip of the leaf pointed or rounded.

The flower base is bare. The sepals are 3 to 8 × 2 to 4 millimeters in size, hairy and bent back 1 to 2 millimeters above the base. The 5 to 17 petals are 6 to 12 × 3 to 6 millimeters in size and yellow. The head of the achenes is 6 to 9 × 7 to 10 millimeters in size and spherical or hemispherical. The achenes are 3.4 to 4.4 × 2.4 to 3.6 millimeters in size and hairless or rarely stiff-haired. Its edge forms a narrow rib 0.1 to 0.2 millimeters wide. The beak is 0.2 to 1.2 millimeters long, curved and persistent.

The species is very similar to Ranunculus californicus , Ranunculus occidentalis and all other plant genes of the occidentalis species group, there are plants with intermediate characteristics that cannot be reliably assigned to a species.

Occurrence

Ranunculus canus occurs in California.

Systematics

Ranunculus canus was first described by George Bentham in 1849 . There are two varieties:

  • Ranunculus canus var. Canus : Synonyms are Ranunculus californicus Bentham var. Canus (Bentham) WH Brewer & S. Watson and Ranunculus canus var. Laetus (Greene) LD Benson . The end sections of the leaf blades are ovate or oblong-ovate to lanceolate. The leaf margins are serrated, the tip is pointed or rounded. There are 5 to 7 petals available. The flowering time is in spring and summer and extends from March to July. The plant grows in grasslands or very open oak woodlands at altitudes from 0 to 1200 meters. It is endemic to California in the Sacramento Valley and the foothills of the adjacent mountains.
  • Ranunculus canus var. Ludovicianus (Greene) LD Benson : Synonyms are Ranunculus ludovicianus Greene and Ranunculus californicus var. Ludovicianus (Greene) KC Davis . The end sections of the leaf blades are lanceolate to oblong lanceolate. The leaf margins are whole or toothed, the tip is pointed or rounded. There are 13 to 17 petals available. The flowering time is in spring and summer and extends from March to August. The plant grows on grassland or on the banks of streams, on waterlogged ground, at altitudes of 1000 to 2300 meters. It is endemic to the Transverse Ranges in California.

Individual evidence

  1. ↑ a b c d e f g Alan T. Whittemore: Ranunculus canus . In: Flora of North America. Vol. 3 . on-line
  2. ^ A b Lyman Benson (1948): A Treatise on the North American Ranunculi. American Midland Naturalist 40 (1): 1-261. JSTOR 2421547

Web links