398 PHILIPPINE FIBER PLANTS 
to 20 centimeters long, heart-shaped, and have toothed margins. 
The flowers and fruits occur in dense clusters. 
This species is very abundant in second-growth forests 
throughout the Philippines. 
Genus PTEROCYMBIUM 
PTEROCYMBIUM TINCTORIUM (Blanco) Merr. (Plate XXVII). TALtTo. 
Local names: Abigén, tadto, taitu (Bataan, Leyte); bangdt (Zambales) ; 
bayad, takung (Surigao); balulaw (Agusan); dwidii (Tayabas) ; huligdno 
(Nueva Ecija); libtuk (Cagayan); malasapsap (Pampanga); marakdpas 
(Calayan Island, Ilocos Sur, Benguet) ; mayuo (Manobo); taldto or talito 
(Nueva Ecija, Bataan, Laguna, Tayabas, Camarines, Mindoro, Negros, 
Palawan, Cotabato); tagungtungan (Cebu); takung (Surigao). 
The bast of this tree is pale orange-yellow. King found that 
rope made from it had a tensile strength of 381 kilos per square 
centimeter. Immersion in water for twenty-four hours increased 
the strength about 7 per cent. 
Pterocymbium tinctorium is a tall tree reaching a height of 
from 45 to 50 meters and a diameter of 90 centimeters. It has 
a straight, regular trunk from 25 to 30 meters in length. It 
occurs in the virgin forests and usually on the drier soils. For 
a short period during the dry season it is leafless. Typical 
leaves are heart-shaped. The fruits are oval, over a centimeter 
long, and with prominent wings 7 to 10 centimeters in length. 
The wood is white, light, and very soft. 
Genus PTEROSPERMUM 
PTEROSPERMUM DIVERSIFOLIUM BI. BayOk. 
Local names: Bdloi, bdroi (Ilocos Sur, Pangasinan, Benguet, Itneg) ; 
bayog, bayok or bayuk (Nueva Ecija, Pampanga, Zambales, Bataan, Rizal, 
Cavite, Laguna, Batangas, Tayabas, Camarines, Catanduanes Island, Min- 
doro, Masbate, Ticao, Negros, Cotabato, Zamboanga, Palawan) ; bayog- 
bayog (Zamboanga) ; bayéng, biyig (Tayabas) ; dibudl (Basilan) ; kabislak 
(Davao) ; talingd’an (Ilocos Norte). 
The bast of this species has very little tensile strength and is 
not commonly used for rope making. The color of the bast is 
pinkish cinnamon. King found rope made from it to have a 
tensile strength of 263 kilos per square centimeter, which wetting 
did not affect. The bark is also used for dyeing purposes. 
Pterospermum diversifolium is a tree reaching a diameter of 
50 centimeters. The leaves are alternate, hairy, oblong, heart- 
shaped at the base, abruptly pointed at the tip, and 11 to 25 
centimeters in length. The flowers are white, 12 to 14 centi- 
meters long, and occur either singly or in pairs in the axils of 
the leaves. The fruit is a woody, five-angled capsule about 15 
centimeters long. 
