Flora of Papua New Guinea 
Lae National Herbarium 
1 0047 Myristicaceae 
Horsfieldia laevigata (Bl.) Warb. 
East Sepik Province, near Langu village; from margins of Metroxylon 
swamp and on lower slopes of adjacent hills, elev. 40-200 m, near 
4° 11' S, 142° 44’ E. 
with 10042 et seq.; 15 m pole treelet on hillside, margin of sago 
swamp; no buttress, outer bark greyish-brown, shallowly fissured, sap 
brownish; twigs angulate between the petioles, appressed - 
puberulent, basiscopically glabrate and terete; terminal bud erect, 
slender, tomentulose, the hairs <.2 mm; leaves alternate, distichous, 
exstipulate, coriaceous, oblique, adaxial surface dark green, 
glabrous x abaxially medium green with minute stellate hairs mainly 
on the midrib (otherwise glabrescent), lamina elliptic-oblong, to 32 
cm x 8 cm, apex acuminate to subcaudate, margin entire, base 
cuneate; petiole 1. 5-2.0 cm, flattened above, glabrate; leaf venation 
pinnate, laterals 16-22 pairs, spreading, closing by supramedial 
loops, reticulum irregular, somewhat feeble, costa prominulous 
above, the other venation flush, below with all main veins manifest 
and raised; flowers not seen; infructescence infrafoliar, paniculiform, 
axial length to c. 7 cm, shortly pedunculate, the axes rather woody, 
often lenticellate, stellately puberulent, ebracteate, marked by 
crateriform abscission scars; fruit subglobose, diameter 18 mm, 
dehiscent on 2 valves, the valves fleshy, orange, smooth or with 
pustulate lenticels, puberulent throughout, erostrate; seed solitary, 
aril entire, yellow-orange. 
\ 
Waskuk.name-guma.’ Said to be used only as firewood. Several 
different species are apparently included under this same local 
name. 
coll: W. Takeuchi 10047 
date: August 15, 1994 
det. WT 
