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We show in this paper that the circulant graph G(2 " ', 4) is Hamiltonian decomposable, and propose a recursive construction method. This is a partial answer to a problem posed by B. Alspach. @ 1997 Published by Elsevier Science B.V.
BACKGROUND AND AIMS Although numerous angraecoid orchids in Madagascar display typical sphingophilous syndrome (i.e. white, nectariferous, long-spurred flowers, producing a strong scent at the crepuscule that is attractive to moths), three species of Angraecum in Reunion, belonging to the endemic section Hadrangis, have atypical unscented and short-spurred… (More)
BACKGROUND AND AIMS Pollinator-mediated selection and evolution of floral traits have long fascinated evolutionary ecologists. No other plant family shows as wide a range of pollinator-linked floral forms as Orchidaceae. In spite of the large size of this model family and a long history of orchid pollination biology, the identity and specificity of most… (More)
Pericopsis elata (Harms) Meeuwen, also known as afrormo-sia, African teak, or assamela, is a deciduous tree that produces one of the most valued tropical timbers of Africa. However, habitat degradation, together with increasing pressures for international exports and regeneration problems, has led to important declines in some of its populations (Dickson et… (More)
Scorodophloeus zenkeri is a tropical tree from mature rainforests of Central Africa, locally threatened by overexploitation. Ten nuclear microsatellite markers, amplifiable in two multiplexed reactions, were developed and characterized in one population. The levels of polymorphism observed (3–15 alleles per locus, expected heterozygosity ranging from 0.198… (More)
Species delimitation within Angraecum section Dolabrifolia is problematic due to morphological variability coupled with overlap in many of the characters traditionally used to distinguish species. Recent molecular phylogenetic studies of the genus included three of the five currently described species of the Dolabrifolia group, placing them as sister to… (More)