Here are my guesses for two of the plants:

Plant nr. 1: Melocactus deinacanthus (long reddish spines, but the lower radial spines as long as the lowermost radial spine).

Plant nr. 3: Melocactus ernestii (lowermost radial spine longer than any of the others)

Cheers,

My guess is Melocactus zehntneri, although the flower is protuding too much above the cephalium than the normal for this species.

Cheers,

I do not think the Melo is azureus - the arrangement of the spines and the shape of the seedling is more typical of plants from the M. violaceus group. I would say concinnus, glaucescens or a bluish form of zehntneri, and my bet for a correct ID goes with the later two names. Well, once it gets old ...

Hi Ian, Yes, the name disciformis was used by Rizzini as a variety of Melocactus margaritaceus . However, the plant that is available in the trade as Melocactus disciformis is in fact Melocactus conoideus . But the name Melocactus margaritaceus var. disciformis Rizzini is invalid according the artic...

Melocactus disciformis is not a nomen nudum - not valid. The correct name of your plant is Melocactus conoideus.

Cheers,

Hello, First a brief introduction to myself: my name is Marlon Machado, I am from the state of Bahia in Brazil, but currently I live in Zurich, Switzerland, where I am doing my PhD whose subject is the systematics of Parodia subgen. Notocactus . I have been fascinated by cacti from childhood. My fat...

I would not mind having one - I like plants with a rough or wrinkled epidermis, and I love Ariocarpus. But I think the price for this cultivar "Godzilla" is too high - maybe in a few years, when it gets more readily available, I will get one for me. A few years back this cultivar existed o...