Bensoniella
Bensoniella oregona
Bensoniella oregona is the only species of the genus Bensoniella in the family Saxifragaceae ( Saxifragaceae ). It is located in northwestern North America.
Description
Vegetative characteristics
Bensoniella oregona grows as a perennial herbaceous plant, reaching heights of growth 19-45 cm. It constitutes neither rhizomes or stolons. The underground part of the stem has scale leaves. The ascending to erect, glandular- hairy stalk has no leaves. The in a basal rosette of leaves standing together leaves are divided into petiole and leaf blade. The glandular hairy petiole is 2-15 long. The 2 to 5 cm long leaf blade is circular to heart-shaped with heart- shaped base and pinnately. The leaf margin is composed of five to nine weak, rounded lobes, which are notched uneven. The leaf surface is hairy glandular; particularly long trichomes are located along the leaf veins. There are Stipules present.
Generative features
In a and sparse and upwards increasingly glandular- hairy, 20-40 cm long, racemose inflorescence stand at less than 1 mm long flower stems 15 to 30 flowers. There are no bracts present. The pale zygomorphic flowers are hermaphroditic and fünfzählig with double perianth. The 2-4 mm long, bell-shaped, white to yellowish- green, short glandular hairy flower cup ( hypanthium ) is up to a third of the ovary grow together; the free area is 0.5 to 0.8 mm long. The five elongated sepals are yellowish- white to green and from 1.5 to 2.5 mm long and covered with short glandular hairs on the edges. The five purple or pink petals are narrowly lanceolate to oblong (thread- like, sometimes coiled ), 1.5 to 2 mm long and unlobed; sometimes they are missing. It is only the outer circle with five stamens present; they are 3 mm long and protrude beyond the petals. The eindrittel - under constant ovary is single chamber. The ovules are completely overgrown and the placentation is parietal. The two 2-3 mm long stylus protrude beyond the petals and each terminating in a scar. The flowering period extends from May to August.
The spherical, zweischnabelige capsule fruit is brown and contains 40 to 50 seeds. The dark brown seeds are oblong to ellipsoid, rarely to 1.8, generally contain 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 limited to the area of the Klamath Mountain Province and Coast Mountains in southwestern Oregon ( Douglas County ) to the north- western California ( Humboldt County ), said only six California localities are isolated at a distance of 176 km from the remaining distribution area with 86 localities. Bensoniella oregona thrives on moist meadows, wetlands and shady pine forests, so prefers moist locations. It grows at altitudes 1000-1600 meters.
System
With the kind Bensoniella oregona ( Abrams & Bacig. ) CVMorton the generic name Bensoniella by Conrad Vernon Morton in Leaflets of Western Botany, 10 ( 11 ), pp. 181 was established in 1965. The new genus name replaces Bensonia and Bensonia oregona published in Leroy Abrams & Rimo Charles Bacigalupi: Contributions from the Dudley Herbarium, 1 ( 3 ), 1929, pp. 95-96, Table 5, f 1, of the generic names of fossil plants Bensonia Buckman, published in Outline of the Geology of the Neighbourhood of Cheltenham, 1845, pp. 93 blocked. This corresponds to the rules of the International Code of Botanical Nomenclature of 1965. This species was described for a copy of the 1916 by JW Thompson in " Snow Camp " in the Siskiyou Mountains in Curry County, Oregon was collected.
The genus name honors the botanist Bensoniella Gilbert Thereon Benson (1896-1928), in Stanford University worked. The specific epithet refers to the oregona 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.