| Cephalocereus | |
|---|---|
 | |
| Cephalocereus senilis | |
Scientific classification | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Order: | Caryophyllales |
| Family: | Cactaceae |
| Subfamily: | Cactoideae |
| Tribe: | Echinocereeae |
| Genus: | Cephalocereus Pfeiff.[1] |
| Type species | |
| Cephalocereus senilis | |
| Species | |
| Synonyms[1] | |
| |
Cephalocereus is agenus of slow-growing, columnar-shaped, blue-greencacti. The genus is native toMexico.
These cacti show a columnar and upright growth habit, and may be branched or unbranched reaching heights of 10 to 12 meters. The light green shoots, which turn gray with age, have a diameter of up to 40 centimeters and are almost completely covered by dense thorns near the top. On the 12 to 30 (or more) vertical ribs are closely spaced dimorphic areoles. The up to 5 central spines are yellowish to gray and up to 4 centimeters long. The numerous, bristly or hair-like radial spines usually enclose the shoot tightly. The flowers are medium-sized, tubular to bell-shaped, borne in a woolly structure calledcephalium which can appear apically or laterally and open at night. The flower cup and the flower tube are covered with small scales.
The fruits are ovoid with small scales, and woolly. The smooth, pear-shaped seeds are black.[2]
The genusCephalocereus was established in 1838 byLudwig Karl Georg Pfeiffer.[1]
As of October 2023[update],Plants of the World Online accepted the following species:[1]
| Image | Scientific name | Distribution |
|---|---|---|
| Cephalocereus apicicephaliumE.Y.Dawson | Mexico (Oaxaca) | |
.jpg) | Cephalocereus columna-trajani(Karw. ex Pfeiff.) K.Schum. | Mexico (Oaxaca and Puebla) |
 | Cephalocereus euphorbioides(Haw.) Britton & Rose | Mexico (Tamaulipas, Veracruz) |
.jpg) | Cephalocereus fulviceps(F.A.C.Weber ex K.Schum.) H.E.Moore | Mexico (Puebla, Oaxaca) |
.jpg) | Cephalocereus macrocephalusF.A.C.Weber ex K.Schum. | Mexico (Puebla, Oaxaca) |
 | Cephalocereus mezcalaensisBravo | Mexico (Colima, Guerrero, Jalisco, México State, Michoacán, Morelos, Oaxaca, Puebla, Tlaxcala) |
| Cephalocereus nudusE.Y.Dawson | Mexico | |
| Cephalocereus parvispinusS.Arias, H.J.Tapia & U.Guzmán | Mexico (Oaxaca) | |
.jpg) | Cephalocereus polylophus(DC.) Britton & Rose | Mexico (Guanajuato to Veracruz) |
| Cephalocereus sanchezmejoradae(A.B.Lau) H.J.Tapia & S.Arias | Mexico (Oaxaca). | |
 | Cephalocereus scoparius(Poselg.) Britton & Rose | Mexico (Veracruz, Oaxaca) |
.jpg) | Cephalocereus senilis(Haw.) Pfeiff. | Mexico (Hidalgo and Veracruz ) |
.jpg) | Cephalocereus tetetzo(F.A.C.Weber ex J.M.Coult.) Diguet | Mexico (Oaxaca and Puebla) |
This genus of cacti is native to central and southernMexico. Its habitat isdesert scrub in theCentral Mexican matorral andSouthern Pacific dry forests.[citation needed]
