Popowia beccarii Scheffer, P. cuspidata Miquel, P. pachypetala Diels, P. cordata Moeljono, and P. nooteboomii Moeljono are shrub.
Popowia pisocarpa Blume Endl., P. fusca King, P. perakensis King, P. hirta Miquel, P. odoardi Diels, P. clavata Diels, P.
cuspidata Miquel P. platyphylla Diels, P. Schefferiana Diels, P. novoguineensis Miquel, and P. papuana Scheffer are small tree. P.
pauciflora Maingay ex Hook.f., P. velutina King, P. tomentosa Maingay ex Hook.f., P. tomentosa var. crinita J. Sinclair, P.
lanceolata Merrill, P. bancana Scheffer, P. cyanocarpa Lauterb. and K. Schum., P. parvifolia Scheffer, P. hentyii Moeljono, and P.
polytrica Diels are tree.
4.1.2. Leaves
Leaves of Popowia Endl. are simple, alternate, membranous characters or coriaceous, granular or subgranular in texture,
glabrous, pubescent or tomentose. The leaves of most Popowia Endl. species vary in size and shape. Popowia pisocarpa Blume
Endl., P. pauciflora Maingay ex Hook.f., P. fusca King, P. velutina King, P. perakensis King, P. tomentosa Maingay ex Hook.f., P.
tomentosa var. crinita J. Sinclair, P. hirta Miquel, P. odoardi Diels, P. beccarii Scheffer, P. cyanocarpa Lauterb. and K. Schum., P.
novoguineensis Miquel, P. platyphylla Diels, P. Schefferiana Diels, P. papuana Scheffer, P. cordata Moeljono, P. nootebomii Moeljono,
and P. polytrica Diels are elliptic – oval or oblong. P. cuspidata Miquel, P. bancana Scheffer, P. clavata Diels, P. pachyptala Diels,
and P. hentyii Moeljono are ovate. P. lanceolata Merrill, P. papuana Scheffer, and P. parvifolia Scheffer are lanceolate.
All Malesian species have the upper leaf surface glabrous or glossy, except in P. tomentosa Maingay ex Hook.f., P. tomentosa
var. crinita J. Sinclair and P. hirta Miquel are tomentose – puberulent. The lower leaf surface are pubescent in Popowia
pisocarpa Blume Endl., P. fusca King, P. velutina King, P.
perakensis King, P. tomentosa Maingay ex Hook.f., P. lanceolata Merrill, P. clavata Diels, and P. polytrica Diels. The lower leaf
surface are pilose in P. pauciflora Maingay ex Hook.f., P. beccarii Scheffer, P. parvifolia Scheffer, P. platyphylla Diels, and P. hentyii
Moeljono. The lower leaf surface are glabrous in P. hirta Miquel, P. cuspidata Miquel, P. cordata Moeljono, P. bancana Scheffer, P.
odoardi Diels, P. novoguineensis Miquel, and P. nooteboomii Moeljono.
The leaves are membranaceous in P. pisocarpa Blume Endl., P. pauciflora Maingay ex Hook.f., P. perakensis King, P. tomentosa
Maingay ex Hook.f., P. tomentosa var. crinita J. Sinclair, P. cuspidata Miquel, P. odoardi Diels, P. beccarii Scheffer, P.
pachypetala Diels, P. cordata Moeljono, and P. hentyii Moeljono. Chartaceous or coriaceous leaves were found in P. fusca King, P.
velutina King, P. lanceolata Merrill, P. hirta Miquel, P. bancana Scheffer, P. clavata Diels, P. cyanocarpa Lauterb. and K. Schum.,
P. novoguineensis Miquel, P. platyphylla Diels, P. schefferiana Diels, P. nooteboomii Moeljono, and P. polytrica Diels.
Acuminate leaf apex can be found in P. pisocarpa Blume Endl., P. pauciflora Maingay ex Hook.f., P. perakensis King, P.
tomentosa var. crinita J. Sinclair, P. lanceolata Merrill, P. hirta Miquel, P. cuspidata Miquel, P. odoardi Diels, P. clavata Diels, P.
novoguineensis Miquel, P. pachyptala Diels, P. platyphylla Diels, P. parvifolia Scheffer, P. hentyii Moeljono and P. nootebomii
Moeljono. Acuter or obtuse leaf apex is observed in P. fusca King, P.
velutina King, P. tomentosa Maingay ex Hook.f., P. bancana Scheffer, P. cordata Moeljono, P. beccarii Scheffer, and P. papuana
Scheffer. The rounded leaf base can be found in Popowia pisocarpa Blume Endl., P. fusca King, P. velutina King, and P. tomentosa
Maingay ex Hook.f. The cordate leaf base can be found in P.
cordata Moeljono. The cuneate or acute leaf base can be found in P.
pauciflora Maingay ex Hook.f., P. perakensis King, P. lanceolata Merrill, P. hirta Miquel, P. cuspidata Miquel, P. bancana Scheffer,
P. clavata Diels, P. novoguineensis Miquel, P. papuana Scheffer, P. parvifolia Scheffer, P. pachyptala Diels, P. platyphylla Diels, P.
nootebomii Moeljono, and P. hentyii Moeljono. The number of main nerves is 5 - 10 pairs in Popowia
pisocarpa Blume Endl., P. pauciflora Maingay ex Hook.f., P. fusca King, P. velutina King, P. perakensis King, P. bancana
Scheffer, P. cuspidata Miquel, P. lanceolata Merrill, P. beccarii Scheffer, P. clavata Diels, P. cyanocarpa Lauterb. and K. Schum.,
P. novoguineensis Miquel, P. papuana Scheffer, P. schefferiana Diels, P. pachypetala Diels, P. polytrica Diels, P. platyphylla Diels,
P. parvifolia Scheffer, and P. nooteboomii Moeljono, and P. hentyii Moeljono. The number of main nerves is 11 – 18 pairs in
P. tomentosa Maingay ex Hook.f., P. tomentosa var. crinita J. Sinclair,
P. hirta Miquel, P. cordata Moeljono, and P. odoardi Diels. The leaf petiole is 1 - 2 mm long in Popowia lanceolata
Merrill, P. bancana Scheffer, P. beccarii Scheffer, P. parvifolia Scheffer, P. platyphylla Diels, P. papuana Scheffer, P. polytrica
Diels, P. cordata Moeljono, and P. nootebomii Moeljono. The leaf petiole is 3 – 5 mm long in Popowia pisocarpa Blume Endl., P.
pauciflora Maingay ex Hook.f., P. fusca King, P. velutina King, P. perakensis King, P. tomentosa Maingay ex Hook.f., P. hirta Miquel,
P. cuspidata Miquel, P. odoardi Diels, P. clavata Diels, P. cyanocarpa Lauterb. and K. Schum., P. novoguineensis Miquel, P.
Schefferiana Diels, P. pachypetala Diels, P. hentyii Moeljono, and P. tomentosa var. crinita J. Sinclair.
4.2. Generative Morphology
