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Telopea Vol. 6(4): 1996 
Welchiodendron longivalve (F. Miiell.) Peter G. Wilson & J.T. Waterhouse 
Stamen bundles in mature flowers of W. longivalve are antepetalous and bifid 
(Fic. 8a,b). The first two sepals are initiated asynchronously on the floral apex m a 
decussate position relative to the axis and floral bract (Fig. 9a, b). The last few sepals 
and the petals are initiated in a spiral sequence, thus petals appear alternate to the 
sepal primordia on the inside of the floral tube (Fig. 9c). The spiral initiation of petal 
Fig. 7. Floral development of Lophostcmon Inctifluus. a, part of a young flower bud showing 
two sepal (K) and two petal (P) primordia. The perianth parts are initiated asynchronously 
(x 300); b, stamen primordia forming on a bulge on the inner face of the invaginated floral 
tube. The stamen primordia are formed in a more or less symmetrical arrangement around 
the midline of the bundle but there is no clear groove or notch in the centre as there is in other 
Lophostemon spp. (x 300); c, part of a flower bud with sepals and petals removed showing two 
groups of stamen primordia. There is more than one row of stamen primordia in each group. 
The primordia in the centre of the upper row of each group are the longest indicating that 
they were the first ones initiated (x 190); d, part of a flower bud with petals and sepals 
removed. Stamen primordia arc fused at the bases (x 110); e, flower bud with petals and 
sepals removed. Both fused and free parts of the filaments have elongated (x 45), f, mature 
flower showing three of the five antepetalous stamen fascicles (x 17). (from UNSW 4016). 
