Pilosocereus machrisii
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| ( EYDawson ) Backeb. |
Pilosocereus machrisii is a species of plant in the genus Pilosocereus from the cactus family(Cactaceae). The specific epithet honors Maurice A. Machris (Los Angeles, USA), after whom the so-called Machris Expedition in central Brazil was named in 1956.
description
Pilosocereus machrisii grows shrubby, branches only at the base and reaches heights of 0.4 to 3.5 meters. The upright, smooth, dark green to blue-green, somewhat gray or glaucoma shoots are slightly woody and have a diameter of 3.2 to 9 centimeters. There are 8 to 15 ribs. The thorns, which are translucent when young, are reddish, brownish or golden in color. Of the 3 to 8 ascending, 1.5 to 4 centimeters long central spines, the longest is bent on old areoles . The 9 to 24 radial spines are 3 to 25 millimeters long. The flowering part of the shoots is very distinct and includes three or more ribs. From the areoles there arise gray, 2 to 3 centimeters long hair.
The funnel-shaped flowers are white with reddish tips. They are 3 to 8 centimeters long and reach a diameter of 3 to 6 centimeters. The depressed spherical fruits have a diameter of 2 to 3.5 centimeters, tear on the side and contain a white pulp. The seeds contained therein are humped.
Distribution, systematics and endangerment
Pilosocereus machrisii is distributed in central and western Brazil and in eastern Paraguay on quartzitic sandstone rocks at altitudes of 150 to 1200 meters.
The first description as Cephalocereus machrisii was published in 1957 by Elmer Yale Dawson (1918-1966). Curt Backeberg placed them in the genus Pilosocereus in 1960 .
In the Red List of Threatened Species of the IUCN , the species is listed as " Least Concern (LC) ". H. listed as not endangered.
proof
literature
- Edward F. Anderson : The Great Cactus Lexicon . Eugen Ulmer KG, Stuttgart 2005, ISBN 3-8001-4573-1 , p. 542 .
Individual evidence
- ^ Angeles County Museum Contributions in Science . Volume 10, Los Angeles 1957, p. 1.
- ↑ The Cactaceae: Handbook of the cactus science . Volume 4, 1960, p. 2419.
- ↑ Pilosocereus machrisii in the IUCN Red List of Threatened Species 2013.2. Listed by: Zappi, D. & Taylor, NP, 2010. Retrieved January 5, 2014.
