Cephalocereus columna-trajani

Cephalocereus columna-trajani grows with non-branching green shoots and reaches heights of 6 to 10 meters with diameters of up to 40 centimeters. There are 16 to 26 ribs, which are almost completely divided into cusps by transverse furrows. Abundant white, silky hairs emerge from the white areoles near the tip of the shoot. The 5 to 8 downward-facing, stiff central spines are grayish and up to 8 centimeters long. The 14 to 18 white marginal spines are up to 1 centimeter long. The clearly lateral, narrow, 2 to 3 meter long pseudocephalium extends to the top of the shoot and is usually directed north. It consists of yellowish, woolly hairs 4 to 6 centimeters long. The tubular to bell-shaped flowers are white to light yellow and have a length of up to 7.5 centimeters and the same diameter. File:Ccolumnatrajaniseedling.JPG|seedling File:Cephalocereus columna-trajani (1).jpg|Spines File:Cephalocereus hoppenstedtii (columna-trajani) (5754252406).jpg| Small Plant File:Cephalocereus columna-trajani skin.jpg|Skin File:Cephalocereus hoppenstedtii (columna-trajani) (5754255126).jpg|adult plant ==Distribution==

Cephalocereus columna-trajani is found in xerophyllous scrub habitat in the Mexican states of Oaxaca and Puebla at elevations between 600 and 1800 meters, where it forms dense forests. Plants are found growing along with Cephalocereus tetetzo, Coryphantha pallida, Mammillaria haageana and Mammillaria mystax. File:Cephalocereus columna-trajani rev.jpg| Habitat in near Tehuacán, southeastern Puebla state, Central México. File:Cephalocereus columna-trajani (5754202804).jpg|Habitat in Zapotitlan De Las Salinas, Puebla ==Taxonomy==

The first description as Cereus columna-trajani was published in 1837 by Ludwig Georg Karl Pfeiffer. The specific epithet columna-trajani comes from Latin, means 'Trajan's Column' and refers to the stately nature of the species. Karl Moritz Schumann placed the species in the genus Cephalocereus in 1897. Further nomenclature synonyms are Cephalophorus columna-trajani (Karw. ex Pfeiff.) Lem. (1831), Pilocereus columnatrajani (Karw. ex Pfeiff.) Lem. (1839), Cephalocereus columna (Karw. ex Pfeiff.) K.Schum. (1894), Pachycereus columnatrajani (Karw. ex Pfeiff.) Britton & Rose (1909), Mitrocereus columna-trajani (Karw. ex Pfeiff.) Backeb. ex E.Y.Dawson (1948) and Haseltonia columna-trajani (Karw. ex Pfeiff.) Backeb. (1960). == References ==