''Willughbeia sarawacensis'', commonly known as ''kubal'' or ''kubal madu'' (Malaysia) and ''tabo'' (Philippines), is a large tropical

vine A vine (Latin ''vīnea'' "grapevine", "vineyard", from ''vīnum'' "wine") is any plant with a growth habit of trailing or scandent (that is, climbing) stems, lianas or runners. The word ''vine'' can also refer to such stems or runners themselv ...

-bearing plant with edible fruit native to

Borneo Borneo (; id, Kalimantan) is the third-largest island in the world and the largest in Asia. At the geographic centre of Maritime Southeast Asia, in relation to major Indonesian islands, it is located north of Java, west of Sulawesi, and eas ...

and to the nearby island of

Palawan Palawan (), officially the Province of Palawan ( cyo, Probinsya i'ang Palawan; tl, Lalawigan ng Palawan), is an archipelagic province of the Philippines that is located in the region of Mimaropa. It is the largest province in the country in ...

in the

Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...

.Kew World Checklist of Selected Plant Families
/ref> There are four related varieties known in Borneo: kubal asam or kubal taya, kubal tusu or kubal madu, kubal arang (all fall under ''Willughbeia sarawakensis''), and another much bigger cousin tabau (''Willughbeia elimeri'').

Description

The fruit is the shape, size, and colour of a

grapefruit The grapefruit (''Citrus'' × ''paradisi'') is a subtropical citrus tree known for its relatively large, sour to semi-sweet, somewhat bitter fruit. The interior flesh is segmented and varies in color from pale yellow to dark pink. Grapefruit is ...

with a thin

melon A melon is any of various plants of the family Cucurbitaceae with sweet, edible, and fleshy fruit. The word "melon" can refer to either the plant or specifically to the fruit. Botanically, a melon is a kind of berry, specifically a "pepo". The ...

-like rind and a concentrated sweet taste comparable to

mango A mango is an edible stone fruit produced by the tropical tree ''Mangifera indica''. It is believed to have originated in the region between northwestern Myanmar, Bangladesh, and northeastern India. ''M. indica'' has been cultivated in South a ...

soursop Soursop (also called ''graviola, guyabano'', and in Hispanic America, ''guanábana'') is the fruit of ''Annona muricata'', a broadleaf, flowering, evergreen tree. It is native to the tropical regions of the Americas and the Caribbean and is wid ...

and

pineapple The pineapple (''Ananas comosus'') is a tropical plant with an edible fruit; it is the most economically significant plant in the family Bromeliaceae. The pineapple is indigenous to South America, where it has been cultivated for many centuri ...

combined. At the government experimental station near

Kuching Kuching (), officially the City of Kuching, is the capital and the most populous city in the States and federal territories of Malaysia, state of Sarawak in Malaysia. It is also the capital of Kuching Division. The city is on the Sarawak River ...

Sarawak Sarawak (; ) is a States and federal territories of Malaysia, state of Malaysia. The largest among the 13 states, with an area almost equal to that of Peninsular Malaysia, Sarawak is located in northwest Borneo Island, and is bordered by the M ...

, they are grown on elevated platforms and said to start producing in less than two years. All four are round in shape except kubal tusu, which is pear-shaped. Kubal arang (charcoal) has a distinctive charcoal-coloured seed.

References

External links

Sarawak Forestry
{{Taxonbar, from=Q13962163 sarawacensis Plants described in 1898 Tropical fruit Flora of Borneo Flora of Palawan Fruits originating in Asia