Ranunculus arizonicus

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Ranunculus arizonicus
Systematics
Family : Buttercup Family (Ranunculaceae)
Subfamily : Ranunculoideae
Tribe : Ranunculeae
Genre : Buttercup ( Ranunculus )
Type : Ranunculus arizonicus
Scientific name
Ranunculus arizonicus
Lemmon ex. A. Gray

Ranunculus arizonicus is a species of the buttercup family. It grows in the arid mountains of southern North America.

description

The stems are 14 to 38 centimeters long, erect and hardly hairy. Each stem bears 2 to 12 flowers . The roots are 1 to 2.5 millimeters thick and cylindrical. The basal leaves are not persistent until flowering, sometimes the very innermost leaves are excluded. All that remains is a dense tuft of fibers. The leaf blade is 3.2 to 4 × 4 to 6.2 inches in size and semicircular to kidney-shaped. The outer leaves are undivided, while the inner leaves are 5 to 7 parts. The leaf base is blunt to heart-shaped, the edge completely to toothed and the tip of the leaflet is pointed to rounded. The flower stalk is hairy or hairless. The recipe shows short and thick white-gray hairs. The sepals are 3 to 5 × 1 to 3 millimeters in size and hairless or thinly fine-haired on the underside. The hair is colorless. The mostly 5, rarely up to 11 petals are 7 to 15 × 2 to 6 millimeters in size. The nectar scale is ciliated. The head of the achenes is 4 to 10 × 4 to 6 millimeters in size and ovoid or cylindrical. The achenes are 1.8 to 2.5 × 1.5 to 2 millimeters in size and lightly or densely hairy white-gray. The beak is 0.8 to 1.2 millimeters long, straight and subpulate. It's fragile and often broken off.

The species blooms from July to September.

Occurrence

Ranunculus arizonicus grows in river beds at altitudes of 1500 to 2400 meters. It is especially indicated for dry locations. The species is endemic to a region in the highlands of southwestern New Mexico , southeastern Arizona, and the states of Sonora and Chihuahua .

Taxonomy

The species belongs within the genus Ranunculus in the section Epirotes . In 1885, the botanist Asa Gray lists two varieties of the species in addition to the nominate form , which are also listed in the systematic directory of the Missouri Botanical Garden (tropicos.org):

  • Ranunculus arizonicus var. Subaffinis . The American botanist Lyman David Benson introduced this variety to Ranunculus inamoenus var. Subaffinis . This view has prevailed
  • Ranunculus arizonicus var. Subsagittatus . This was understood by Benson as the variety Ranunculus cardiophyllus var. Subsagittatus . Today this variety is no longer recognized as a rule, thus synonymous with Ranunculus subsagittatus .

This means that neither varieties nor subspecies are recognized for the species.

Individual evidence

  1. ^ Thomas Henry Kearney, Robert Hibbs Peebles: Flowering Plants and Ferns of Arizona. US Department of Agriculture, Miscellaneous publication no. 423. 1942 Preview on Google Books
  2. ↑ Stephen S. White (1948): The Vegetation and Flora of the Region of the Rio de Bavispe in Northeastern Sonora, Mexico. Lloydia 11 (4): 229-300.
  3. ^ Asa Gray (1885): Contributions to American Botany. 1. A Revision of the North American Ranunculi. Proceedings of the American Academy of Arts and Sciences 21: 363-413. online at JSTOR
  4. ^ Ranunculus arizonicus Lemmon ex A. Gray at Tropicos.org. Missouri Botanical Garden. Retrieved February 16, 2016
  5. ^ A b Lyman Benson (1941): North American Ranunculi-III. Bulletin of the Torrey Botanical Club 68 (9): 640-659. online at JSTOR
  6. ↑ cf. about Ranunculus in Plants Database of the US National Resources Conservation Service, accessed on February 16, 2016

supporting documents

  • Alan T. Whittemore: Ranunculus arizonicus . In: Flora of North America. Vol. 3 . on-line

Web links