Mammillaria dehertiana ssp. dodsonii

   

This interesting subspecies, like subspecies dehertiana, grows on top of mountains whenever there is a clearing in pine forests on exposed rocks among moss. The subspecies dehertiana is found from around the city of Oaxaca, Between Nejapa, Juquilla Mixes and Lachuguiri while subspecies dodsonii grows near Benito Juarez and near San Antonio Cuajimoloyas. The ones pictured were found near San Antonio Cuajimoloyas. 

According to the late Alfred Lau one Taxon integrates into the other as one gets further South and East of Oaxaca. Even The late Werner Repenhagen who is considered as a splitter declared that they are one variable species.

Mammillaria dehertiana ssp. dodsonii has large purple flowers, up to 4cm long. It is found solitary or offsets in the wild and in cultivation it is easier to keep alive than M. deheriana ssp. dehertiana.

      

Pachycereus weberi

As one enters the Tehuacan-Cuicatlan area in the States of Puebla and Oaxaca, one is confronted with a majestic vista of cereus forests some of whom comprises the largest species of Cacti in existence; Pachycereus weberi. The Tehuacan-Cuicatlan area is one of the richest cacti habitat in the whole of Mexico. This species certainly rivals Carnegea gigantea in sheer volume of branches if not in height.

Its flowers are from pale yellow to white and are produced on the sides of the branches, near the apex. It is mentioned in literature that the flowers are nocturnal but if so they certainly remain open during the day. Pachycereus weberi grows to about 10 meters in height. It starts to branch from approximately two meters from the base and produces candelabra-like branches. Each branch is bluish green in colour and the areoles are spaced from 3 to 5 cm apart.                                                                                                     

               

Mammillaria klissingiana

I found this species growing very near the town of Guadalcazar, San Luis Potosi. Previously I had found this plant, albeit more elongated forms, near Jaumave in Tamaulipas.

This form is more round and compact resembling M. formosa in shape. M. brauniana has been referred under M. klissingiana and further study may link this species with M. formosa and even M. leucocentra which some authorities claim to be a subspecies of M. geminispina.

Whatever species it is called it is a joy to find and several hours of searching only produced a few plants mostly found near the shade of rocky outcrops or under bushes.

Other cacti found in the vicinity were Echinocereus cinerascens, and an Opuntia species.

All the M. klissingiana found had pink to reddish flowers but one species growing in the proximity of a pink flowering species had pale flowers as can be seen in these pictures.

Agave victoria-reginae

Agave victoria-reginae can be found growing at Huasteca canyon, Santa Catarina, Monterrey, in the state of Nuevo Leon.

It is found on both sides of the canyon on sheer rock together with Epithelantha micromeris,Echinocereus viereckii and Mammillaria ritteriana.

It is not difficult to find and can be seen from the dirt road leading to the canyon but not very easy to reach due to the almost vertical cliffs.

Like all Agave species, This plant will die after flowering as the flowering stock is terminal. It rarely offsets before it flowers. Yet it produces hundreds of seeds that are dispersed throughout the valley.