Bensoniella oregona
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Bensoniella oregona |
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| Scientific name of the genus | ||||||||||||
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| CVMorton | ||||||||||||
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| ( Abrams & Bacigal. ) CVMorton |
Bensoniella oregona is the only plant species of the genus Bensoniella in the family of the Saxifragaceae (Saxifragaceae). It isnative tonorthwestern North America. The plant was discovered by botanist Lilla Irvin Leach , who specialized in Oregon flora from 1915 to 1945.
description
Vegetative characteristics
Bensoniella oregona grows as a perennial herbaceous plant and reaches heights of 19 to 45 cm. It does not form rhizomes or stolons. The underground part of the stem has scale-shaped lower leaves. The ascending to upright, glandular hairy stem has no leaves. The foliage leaves standing together in a basal rosette are divided into a petiole and a leaf blade. The glandular hairy petiole is 2 to 15 long. The 2 to 5 cm long leaf blade is circular to heart-shaped with a heart-shaped base and pinnate. The leaf margin is composed of five to nine weak, rounded lobes that are unevenly notched. The leaf surface is hairy glandular; particularly long trichomes are located along the leaf veins . There are stipules present.
Generative characteristics
In one and sparsely hairy glandular, 20 to 40 cm long, racemose inflorescence, there are 15 to 30 flowers on peduncles less than 1 mm long. There are no bracts . The weak zygomorphic flowers are hermaphroditic and five-fold with double perianth . The 2 to 4 mm long, bell-shaped, yellowish-white to green, short glandular hairy flower cup (hypanthium) is fused with the ovary up to a third; the free area is 0.5 to 0.8 mm long. The five elongated sepals are yellowish-white to green and 1.5 to 2.5 mm long and have short glandular hairs on the edges. The five purple or pink petals are narrowly lanceolate to elongated (threadlike, sometimes coiled), 1.5 to 2 mm long and unlapped; sometimes they are missing. There is only the outer circle with five stamens ; they are 3 mm long and rise above the petals. The eindrittel-under permanent ovary is unilocular. The ovules are completely fused and the placentation is parietal. The two 2 to 3 mm long styles protrude beyond the petals and each end in a scar. The flowering period extends from May to August.
The globular, two-beaked capsule fruit is brown and contains 40 to 50 seeds. The dark brown seeds are elongated to ellipsoidal, rarely 1.8 to, usually 2 to 2.7 mm long and smooth. The seeds are ripe in August.
The basic chromosome number is n = 7.
Occurrence
The distribution area of Bensoniella oregona is limited to the area from the Klamath Mountain Province and Coast Mountains in southwestern Oregon ( Douglas County ) to northwestern California ( Humboldt County ), with only six California localities isolated from the rest at a distance of 176 km Distribution area with 86 sites. Bensoniella oregona thrives on moist meadows, in swamp areas and shady coniferous forests, so it prefers moist locations. It grows at altitudes between 1000 and 1600 meters.
Systematics
With the species Bensoniella oregona (Abrams & Bacig.) CVMorton , the genus name Bensoniella was established in 1965 by Conrad Vernon Morton in Leaflets of Western Botany , 10 (11), p. 181. The new generic name replaces Bensonia and Bensonia oregona published in Leroy Abrams & Rimo Charles Bacigalupi : Contributions from the Dudley Herbarium , 1 (3), 1929, pp. 95-96, plate 5, f. 1. Blocking the fossil plant generic name Bensonia Buckman , published in Outline of the Geology of the Neighborhood of Cheltenham , 1845, p. 93. This corresponds to the rules of the International Code of Botanical Nomenclature of 1965. This species was described after a specimen that was collected in 1916 by JW Thompson in "Snow Camp" in the Siskiyou Mountains in Curry County, Oregon.
The generic name Bensoniella honors the botanist Gilbert Thereon Benson (1896–1928), who worked at Stanford University. The specific epithet oregona refers to the locality and main distribution in Oregon.
swell
- Elizabeth Fortson Wells & Patrick E. Elvander: Bensoniella in the Flora of North America , Volume 8, 2009, p. 83: Genus and Species - Online.
- L. Hoover & R. Holmes: Management Recommendations for Vascular Plants - Conservation Report - Online 1998.
