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Cactus taxonomy is in a state of flux. It has been from the start. The genus Cactus, established in 1759 by Linnaeus had to be abandoned very early on it was so fluxed.
In modern times molecular genetics has started to play a significant role in taxonomy and it is revealing relationships that had previously been discounted. In same ways this is unfortunate for those of us who hate change, however it does mean that taxonomic questions can be approached with less trepidation. There is less rib counting, less areole investigation and fewer spines to extract. There is altogether less poking of an actual cactus. We are also given a short respite from the desperate linguistic race to find ever more obscure technical terms to describe a round green blob with reproducible precision.
It isn't all bad.
Echinopsis could be seen as one of the beneficiaries of the new approach, the genus has gobbled up all sorts of its relatives and although this creates some conceptual confusion, we will all get over it eventually. We have all become accustomed to Echinopsis as small, rounded cacti with very large, short lived flowers and there are a multitude of hybrids and horticultural selections that emphasise those characteristics. New additions to the genus will require us to change our expectations. One early addition was Lobivia. The whole genus has been subsumed into Echinopsis and it will result in some unfamiliar names appearing accompanied by dirty looks from the old folk. Chamaecereus silvestrii has also bitten the taxonomic bullet and jumped into Echinopsis.
The consequence is that all of the x Chamaelobivia hybrids (and there are hundreds of them) with their distinctive offsetting form and smaller flowers will now be listed as Echinopsis hybrids. They are so distinctive that for now I am going to refer to them as the Chamaelobivia Group and perhaps that will help to ease a difficult transition.

(I haven't yet reconciled the new nomenclatural combinations so some of these names are tentative and will be confirmed at a later date).

  • Echinopsis 'Arabesque'
  • Echinopsis 'Arctic Snow'
  • Echinopsis arebaloi
  • Echinopsis 'Ashcott Purple' (Chamaelobivia Group)
  • Echinopsis aurea schaferi
  • Echinopsis backebergii sheileana
  • Echinopsis 'BBC East Midlands Today'
  • Echinopsis 'Bourne Razzle Dazzle Strain'
  • Echinopsis candicans
  • Echinopsis 'Caroline' (Chamaelobivia Group)
  • Echinopsis chamaecereus 'Lutea' (Chamaelobivia Group)
  • Echinopsis 'Charlemagne'
  • Echinopsis 'Claire Northcott' (Chamaelobivia Group)
  • Echinopsis 'Cream in the Pink'
  • Echinopsis 'Darley Sunrise'
  • Echinopsis 'Delicate'
  • Echinopsis 'Devon Snowflake' (Chamaelobivia Group)
  • Echinopsis famatimensis
  • Echinopsis 'Gerrit's Lemon'
  • Echinopsis 'Gold Star'
  • Echinopsis 'Green Gold'
  • Echinopsis haematantha kuehnsichii
  • Echinopsis 'Lincoln Delight' (Chamaelobivia Group)
  • Echinopsis 'Lincoln Gem' (Chamaelobivia Group)
  • Echinopsis 'Lincoln Giant' (Chamaelobivia Group)
  • Echinopsis 'Lincoln Imp' (Chamaelobivia Group)
  • Echinopsis 'Lincoln Jubilee' (Chamaelobivia Group)
  • Echinopsis 'Lincoln Magic' (Chamaelobivia Group)
  • Echinopsis 'Lincoln Prince' (Chamaelobivia Group)
  • Echinopsis 'Lincoln Rainbow' (Chamaelobivia Group)
  • Echinopsis 'Lincoln Sentinel' (Chamaelobivia Group)
  • Echinopsis 'Lincoln Sheen' (Chamaelobivia Group)
  • Echinopsis 'Lincoln Sunbeam' (Chamaelobivia Group)
  • Echinopsis 'Lincoln Sunkissed' (Chamaelobivia Group)
  • Echinopsis 'Lincoln Treat' (Chamaelobivia Group)
  • Echinopsis 'Lincoln Twilight' (Chamaelobivia Group)
  • Echinopsis 'Lisa'
  • Echinopsis 'Louise Jackson' (Chamaelobivia Group)
  • Echinopsis 'Marina's Orange'(Chamaelobivia Group)
  • Echinopsis 'Moon Glow'
  • Echinopsis 'Mystic Moon'
  • Echinopsis oxygona
  • Echinopsis 'Paramount Yellow'
  • Echinopsis pentlandii
  • Echinopsis 'Pineapple Poll'
  • Echinopsis 'Pink Camay'
  • Echinopsis 'Pink Champagne'
  • Echinopsis 'Rhodanite'
  • Echinopsis 'Samantha Smith'
  • Echinopsis 'Sarah'
  • Echinopsis 'Shot Scarlet' (Chamaelobivia Group)
  • Echinopsis 'Shot Silk' (Chamaelobivia Group)
  • Echinopsis 'Soft Touch'
  • Echinopsis 'Spring Blush'
  • Echinopsis 'Spring Symphony'
  • Echinopsis subdenudata
  • Echinopsis 'Turandot'
  • Echinopsis 'Vivid'