Lophophora koehresii (Říha) Bohata, Myšák & Šnicer
aka Lophophora diffusa (Croizat) Bravo var. Koehresii Říha
Jan Říha (1996) Kaktusy (Brno), 32(3): 70, as Lophophora diffusa var. koehresii
Jaroslav Bohata, Vojtěch Myšák & Jaroslav Šnicer (2005) Kaktusy (Brno) Special Issue, 2: 20, as Lophophora koehresii
Most people who study Lophophora consider L. koehresii to be an accepted species. The IPNI still lists it as an unresolved name. At some point that will change.
Lophophora koehresii flower in habitat;
Copyright Cactus Conservation Institute; from their website
Reported to contain only traces of mescaline.
Lophophora koehresii in habitat;
from Cactus Conservation Institute
Origin: Las Tablas, San Luis Potosi, Mexico.
Habitat: Alluvial silt flats that are occasionally flooded.
Lophophora koehresii flower
as Lophophora diffusa var. koehresii Říha
Corpus simplex, pars eius viridis 40-45 mm lata et 20-30 mm longa, pars subterranea 35-40 mm lata et 100-130 mm longa, brunescens, in radices crassos, carnossos, sensim transiens. Corpus viride, supraterraneum in costas 5-6 (postea usque 7) divisus, costea ca. 2 mm altae, et 5-7 mm latae, diffuse undulatae, epidermis caeruleo-viridis. Areola circularis, 2-3 mm magna, albo-Ianata. Perianthi phyla cremo-alba usque rosea, ad 25 mm longa et 3 mm lata, oblanceolata, integrrima interdum apice leviter fimbriata, stria media obscura praedita. Organa reproductionis cum varietatae typica conformia. Fructus claviformis usque pyriformis, tantum ca. 10-15 mm longus et 4-5 mm latus. Samen ca. 1,1 mm magnum, globosum, testa nigra, reticulata.
Habitat: prope Cd. Las Tablas, San Luis Potosi, Mexico, in altitudine ca. 1000 m ubi solum lutosum tumulosum, planum.
Lophophora koehresii seedlings
This has been variously described as a variety of L. williamsii and of L. diffusa or an intermediate between the two. [Also appearing as Lophophora sp. Rio Verde and as L. viridescens/L. diffusa viridescens] It shows larger flowers with thin petals and is distinct from either Lophophora species. The flowers resemble variant forms sometimes seen in Lophophora williamsii but the morphology, chemistry and DNA work all place it much closer to L. diffusa.
Bohata & coworkers fairly recently renamed it as a species.
Lophophora koehresii flower
Edward Anderson encountered this in the field but confused it for L. williamsii in his thesis, when commenting on that species can sometimes be found growing in silty flats that are flooded for part of the year. L. williamsii is not found growing in silty flats, those turned out to be L. koehresii.
Lophophora koehresii in habitat;
from Cactus Conservation Institute
Associations: A detailed listing does not appear to exist yet. The following can be observed in the photographs online at the Cactus Conservation Institute website:
Ariocarpus kotschoubeyanus
Chamaesyce spp.
Coryphantha sp.
Dyckia sp.
Echinocactus horizonthalonius
Echinocereus pentalophus
Echinocereus spp.
Echevaria sp. or similar
Kalanchoe sp.
Larrea tridentata
Mammillaria magnimamma
Manfreda sp.
moss
Myrtillocactus geometrizans
Opuntia engelmannii
Opuntia leptocaulis
Porlieria angustifola
Prosopis sp.
Sedum sp.
Stenocactus spp.
Stenocereus sp.
Tiquilia spp.
Viguiera sp.
Lophophora koehresii seedling from European seed
Analysis of Lophophora koehresii
Hordenine (0.37% [± 0.05] of the total alkaloid content) Štarha & Kuchyňa 1996; [0.4% of total alkaloid; Štarha 1997]
N-Methyl-3,4-dimethoxyphenethylamine (0.01% [± 0.01] of the total alkaloid content) Štarha & Kuchyňa 1996
Mescaline (1.32% [± 0.35] of the total alkaloid content) Štarha & Kuchyňa 1996; [1.3% of total alkaloid; Štarha 1997]
N-Methylmescaline (0.07% [± 0.02] of the total alkaloid content) Štarha & Kuchyňa 1996; [0.1% of total alkaloid; Štarha 1997]
3,5-Dimethoxy-4-hydroxyphenethylamine (0.10% [± 0.02] of the total alkaloid content) Štarha & Kuchyňa 1996.
Useful synonyms to use as search terms for locating more imagery online:
考氏乌羽玉 & also 顯疣烏羽玉（Lophophora koehresii）
Lophophora koehresii seedlings