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Telopea Vol. 6(4): 1996 
same degree as in Lophostemoii, rather the stamen filaments are fused for only a short 
distance. This results in the filaments being clustered in groups on the hypanthium 
rather than arising from the inner face of a large fascicle. 
Xanthostemon oppositifolius F.M. Bailey 
Mature flowers of X. oppositifolius have numerous stamens in a ring around the 
hypanthium (Fig. 12). The stamens are not fused and there are generally two rows in 
front of the petals and a single row in front of the sepals. Tlie petal primordia form 
alternately to the sepal primordia on the inside of the floral tube. There is no pre- 
staminal bulge prior to stamen initiation. As the petal primordia enlarge (Fig. 13a-d), 
two stamen primordia are initiated on the floral tube in front of each petal. Subsequent 
Fig. 11. Floral development of Tristaniopsis laurim. a, part of a young flower bud showing two 
adjacent petal primordia (P). There is a pre-stnminal bulge (PSB) in front of each petal primordium 
(x 305); b, two adjacent petal primordia. The difference in size of the petal primordia reflects their 
asynclironous initiation. Stamen primordia (S) arise from the I^SB in front of the petals (x 215); 
c, petal and stamen primordia at a later stage of development. The difference in size between 
adjacent primordia is still apparent. More stamen primordia are inserted beneath and around the 
original ones (x 170); d, flower bud with sepals and petals removed. Bundles of antepetalous 
stamens are distributed around the hypanthium (x 20.5); e, part of a mature flower showing two 
groups of stamens. Filaments are not fused but remain grouped in front of the petals. The 
hypanthium is slightly raised where the filaments are attached (x 16). (from AND 561). 
