Perrierosedum
Perrierosedum madagascariense is the only species of the monotypic genus Perrierosedum in the family Crassulaceae ( Crassulaceae ). The botanical name of the genus honors the French botanist Joseph Marie Henry Alfred Perrier de la Bâthie and simultaneously refers to the similarity with the genus Sedum. The epithet of the species refers to the distribution area of Madagascar.
Description
Perrierosedum madagascariense forms branched, perennial small shrubs with bare, four-sided stems and reaches stature heights of 50 to 80 centimeters. The seated against constantly arranged leaves are oblong spatulate shaped, 2.5 to 5 centimeters long and 1.5 to 2.5 inches wide. They are rounded at the top and narrowed at the base long. The leaf margins are finely notched.
The terminal, five to zehnblütige inflorescence is ebensträußig - zymös. The hermaphrodite flowers are sechszählig (rarely fünfzählig ) and obdiplostemon. Your flower stem is 8 to 10 millimeters long. The free sepals are ovate, rounded at the tip and 4-5 millimeters long. The also free white and red tinged petals are broadly spatulate, convex, fünfaderig. They are round, 8 and 10 mm long at the tips. The upright stamens 6 and 7 millimeters long. The elongated, two-column at the tips Nektarschüppchen are 3 to 3.5 millimeters long.
The fruits are follicles with about 30 ovules per bellows. The seeds are cylindrical, the seed coat is striped lengthwise.
Systematics and distribution
Perrierosedum madagascariense is widespread in Madagascar in Andringitra massif. There, the plants were rediscovered only in 2007 and was first photographed.
The only species of the genus was first described in 1923 as Sedum madagascariense by Joseph Marie Henry Alfred Perrier de la Bâthie ( 1873-1958 ). Alwin Berger she put 1930 in the section of the genus Sedum Perrierosedum. Hideaki Ohba (* 1943) got the final section 1978 in the rank of a genus with only one kind