Sorbus franconica
The Franconian (Sorbus franconica ), also known as Franconian bastard Whitebeam is a plant - type, the complex of bastard flour berries ( Sorbus latifolia agg. ) Belongs. It is a deciduous tree, which is probably from a hybridization of the Pannonian (Sorbus pannonica Kárpáti ) from the Sorbus aria- group with the wild service tree (Sorbus torminalis ) has emerged. She is an apomictic species and propagated asexually.
Description
The Franconian Whitebeam is a deciduous or deciduous tree or shrub, the plant height of 10 ( rarely to 15) achieved meters and often occurs as a multi-stemmed coppice. The leaves look where the Badische (Sorbus badensis ) are very similar. They have a 10 to 15 mm long petiole. The leaf blade is 7.5 cm long and 4.5 cm wide. She has a blunt wedge - shaped base and running upwards pointed together. The leaves have four, sometimes five pairs of pointed lobes and usually nine (rarely eight or ten) pair of lateral nerves. Leaves of sterile short shoots often have a couple more cloth and a pair of lateral nerves less than the fertile short shoots. The depth of the flap incisions there is 5 to 7 millimeters. The diameter of the hair sheet varies from 9 to 11 microns.
See the egg-shaped orange-yellow fruit similar to a small apple. They reach a length of 10 to 12 mm and a width of 10 to 11 millimeters. The epidermis of the fruit showing lenticels with a diameter of 0.2 millimeters. The triangular fruit sepals are of a fleshy texture, not dry up after flowering and remain to maturity spread.
The pollen is numb up to 60 percent, the rate of germination is classified as good.
Occurrence
Dissemination
This species is endemic to the north of the Free State of Bavaria. It grows in Wiesentfels -Jura in the Franconian Switzerland. The Franconian Whitebeam has become quite rare, but is not specifically protected by the Federal Species Protection Ordinance. According to the Red List, it applies in the Free State of Bavaria as endangered.
Location
The Franconian Whitebeam preferably clear, book -rich mixed forests. It grows always Weißjurakalkböden, especially on dolomite. They are found in the Franconian Switzerland at altitudes 450-500 meters. Usually the Franconian flour berry grows in company with the two parental species. Sometimes resigns one parent, also can both parental species are missing. It tolerates more shade than Sorbus aria and settled higher altitudes than Sorbus torminalis.
Botanical history
Kaufmann ( 1892) and August Friedrich Schwarz (1915 ) reported today its kind in local floras of several sites as a bastard. On Joseph Friedrich Nicolaus Bornmüller (1918 ) the name Sorbus franconica goes back. He summed up the clan to as a bastard of Sorbus graeca and Sorbus torminalis. Zoltan Karpati shared the Sorbus latifolia group in 1960 in a rough - and small-leaved Sorbus franconica - group ( Sorbus Sorbus graeca × torminalis ) and a soft - and large-leaved Sorbus latifolia group ( Sorbus aria Sorbus × torminalis ). Also due to the results of flavonoid studies this structure applies mainly hypothetical. Ruprecht Duell (1961 ) gave the clan as apomiktisches taxon species rank. Konrad Gauckler, expanding the known to date sites and noted the growth places on the newly found manuscript maps created from black.
Deposits were also assigned to the Franconian Whitebeam in the southern Franconian Alb in the 1970s to the 1990s, but in the revision of Meyer et al (2005) were separated as an independent small species. In Regensburg the Franconian Whitebeam is three taxa (Sorbus ratisbonensis, Sorbus Sorbus mergenthaleriana and hoppeana ) replaced, in Altmühltal by Sorbus Eystettensis, in Ries by Sorbus fischeri.