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The history of the genus Caralluma is briefly outlined and characters of potential generic significance are discussed. 29 species of Caralluma — the ‘ango group’ and a few isolated southern African species — plus 2 species currently included in Stultitia are transferred to Pachycymbium. The species remaining are divided amongst four subgenera: Caralluma s. str. restricted to the ‘eucarallumas’, Urmalcalasubgen. nov. and Boucerosia and Desmidorchis previously described as genera. The species are listed and several lectotypified. C.fulleri is transferred to Rhytidocaulon, two subspecies raised to full species (Caralluma edwardsiae and Pachycymbium laticoronum) and two new species described: Caralluma longiflora and Pachycymbium laikipiense.
Part 9 is an illustrated review of Pseudolithos Bally, including a key to species and descriptions. Part 10 discusses the status of Caralluma dodsoniana Lavranos, proposing the hypothesis that it represents an intergeneric hybrid between Pseudolithos cubiformis and Echidnopsis scutellata.
Lampranthus scaber (L.) N.E.Br. and L. emarginatus (L.) N.E.Br. (Mesembryanthemaceae) are lectotypified. It is shown that ‘L. scaber’ is at present applied in an extremely wide sense, not intended in the Linnaean circumscription. The unusual morphology of the real L. scaber is described and interpreted in relation to its habitat, West Coast Renosterveld.
The genus Schlumbergera (Cactaceae) has several different vegetative forms. It is very variable and at least ten alleged forms of the type species, S.russelliana, have been collected and offered during the last 25 years, some of these are described and illustrated. Although naturally occurring intermediates or hybrids between S. russelliana and S.truncata in habitat have not been recorded, several of the forms discussed appear to the writer to be intermediates between these two species. Other intermediates are described and illustrated.
After further debate and a postal ballot of specialists, the IOS Working Party has revised its 1986 ‘consensus’ list of accepted genera. The new list totals 93, i.e. seven more than that of 1986. The synopsis of genera is accompanied by a comprehensive index of generic names, an explanation of the ballot procedure and edited commentary on the proposals ballotted, summaries of recently published tribal classifications, and relevant bibliography.