4.2.1. Sepal.
Popowia Endl. has three sepals which are valvate and small size. The shape and size of sepals of each species is very
characteristic. In most species the sepal are different in shape. The sepal shape is triangular – ovate. It can be found in Popowia
pisocarpa Blume Endl., P. perakensis King, and P. platyphylla Diels. Ovate sepals can be found in P. pauciflora Maingay ex
Hook.f., P. fusca King, P. hirta Miquel, P. cuspidata Miquel, P. cordata Moeljono, P. pachypetala Diels, and P. parvifolia Scheffer.
Broadly cordate sepals can only be found in P. bancana Scheffer. The outside surface of the sepals is tomentose in P. pisocarpa
Blume Endl., P. fusca King, P. perakensis King, P. tomentosa Maingay ex Hook.f., and P. bancana Scheffer. It is pilosa in P.
pachypetala Diels, P. parvifolia Scheffer, and P. platyphylla Diels. It is pubescent or hairy in P. lanceolata Merrill and P. hirta Miquel.
All Malesian species have the inside surface of the sepals glabrous. Most of Malesian species have an acute sepal apex, except in P.
fusca King which has obtuse sepals.
4.2.2. Petal
Popowia Endl. has six petals, 3 at the outer, and 3 at the inner. Petals are sub-orbicular – broad ovate, valvate, coriaceous, and thick.
Outer petals small, spreading, slightly larger than the sepals; inner petals larger than outer, concave inside, erect, their edges at first
adhering, later free, their apices often incurved, base shortly clawed, sometimes the outer and inner petals united at the base forming a
sympetalous corolla. The size of petals of each species is very characteristic. The outside surface of the petals is pubescent in
Popowia pisocarpa Blume Endl., P. pauciflora Maingay ex Hook.f., and P. lanceolata Merrill. It is pilosa – villous in P.
pachypetala Diels, P. parvifolia Scheffer, and P. platyphylla Diels. It is tomentosa in P. fusca King and P. perakensis King. The petals
of most of the Malesian species has glabrous inside surface, except in P. platyphylla which is pilose.
4.2.3. Stamen
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