Tacinga saxatilis
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Tacinga saxatilis blooming and fruiting at the type site |
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| ( F.Ritter ) NPTaylor & Stuppy |
Tacinga saxatilis is a species of the genus Tacinga in the cactus family(Cactaceae). The specific epithet describes "growing on rocks".
description
Tacinga saxatilis has a shrubby to creeping growth, stays low and has numerous branches. The shoots are divided into gray to blue-green, occasionally glauke , circular to egg-shaped segments. The segments are 10 to 16 inches long, 5 to 11 inches wide and up to 1.7 inches thick. The areoles located on the shoots are covered with whitish wool and hair. The glochids are sunk into the segments. There are up to 6 brown, gray or whitish, not particularly stinging, 5 to 14 millimeter long thorns , which often have a black tip. The thorns are needle-like to bristly, stiff, straight or slightly curved and occasionally twisted.
The golden yellow to dark yellow to bright orange flowers are up to 3 centimeters long and have the same diameter. Your bracts are spread out. The spherical to depressed spherical fruits are slightly beaked. They are brownish green to wine red or brownish red, up to 3.8 centimeters long and contain few seeds .
Distribution, systematics and endangerment
Tacinga saxatilis is distributed in northeastern Brazil in the states of Bahia and Minas Gerais at altitudes of 450 to 700 meters. It was first described as Platyopuntia saxatilis in 1979 by Friedrich Ritter . Nigel Paul Taylor and Wolfgang Hermann Stuppy placed them in the genus Tacinga in 2002 .
The following subspecies are distinguished:
- Tacinga saxatilis subsp. saxatilis
- Tacinga saxatilis subsp. pomosa (PJBraun & Esteves) PJBraun & Esteves
- Tacinga saxatilis subsp. occibahiensis (PJBraun & Esteves) PJBraun & Esteves
- Tacinga saxatilis subsp. minutispina (PJBraun & Esteves) PJBraun & Esteves
- Tacinga saxatilis subsp. estevesii ( Opuntia estevesii was transferred as a subspecies to Tacinga , but recombined again to the species Tacinga estevesii in 2015 )
Tacinga saxatilis is in the endangered Red List species the IUCN as " Least Concern (LC) ", d. H. not endangered, classified. The development of the populations is considered stable.
When the list was revised in 2013, the subspecies ' Tacinga estevesii' (PJBraun) PJBraun was recognized by the IUCN and the species is now classified as " Endangered (EN) ". H. listed as endangered. The classification was based on the very small distribution area of about 625 km², the only three known locations of the species and the continued reduction of plants through mining activities in the habitat areas. The development of the population is seen as decreasing.
proof
literature
- Edward F. Anderson : The Great Cactus Lexicon . Eugen Ulmer KG, Stuttgart 2005, ISBN 3-8001-4573-1 , p. 615-616 .
Individual evidence
- ↑ Cacti in South America: Results of my 20 years of field research . Volume 1, 1979, p. 32.
- ^ Studies in the Opuntioideae (Cactaceae). Succulent Plant Research . Volume 6, 2002, p. 112.
- ^ P. Braun: New combinations of Tacinga saxatilis . In: Cacti and other succulents. Volume 69, Issue 4, 2018, pp. 105-108.
- ↑ P. Braun: Tacinga estevesii (PJBraun) PJBraun. In: Cacti and other succulents. Volume 66, Issue 8, 2015, p. 200.
- ↑ tacinga saxatilis in the endangered Red List species the IUCN 2010 Posted by: Taylor, NP, 2002. Retrieved on 26 May, 2010.
- ↑ Tacinga estevesii in the IUCN Red List of Threatened Species 2014.3. Posted by: Taylor, NP, Braun, P., Zappi, D. & Machado, M., 2013. Retrieved January 13, 2015.