Fig. 5.

Fragrance chemistry of sections Hadrangis and Humblotiangraecum in relation to pollination syndromes: (A) emission rhythms; (B) nocturnal scent composition of A. cadetii (orthopteran–pollination) and A. leonis (sphingophily) according to relative percentages (>0·1 %) obtained from GC chromatograms and volatile chemical classes (Table 2). No compounds were detected for A. bracteosum and A. striatum (ornithophily), day or night. Terpenes include mono- and sesquiterpenes; aromatics include nitrogenous aromatic compounds. A., Angraecum; HAD, section Hadrangis; HUM, section Humblotiangraecum.