Punica protopunica
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Through Flowering plant, Endemism and Habitat
The tree, often thorny, attains a height of 2.5 to 4.5 meters. It has reddish-brown bark when young, fading to grey as it ages and becomes less fruitful. Leaves are dark green, glossy and opposite, growing up to 3 cm long. Fruit globose, 2–3 cm in diameter. Flowers and fruits from December and January through to the summer.
P. protopunica is considered to be the precursor to the pomegranate (P. granatum) and is the only other species in the genus Punica. It differs from the pomegranate in having pink (not red), trumpet-shaped flowers and smaller, less sweet fruit. The fruit when ripe are yellow-green or brownish red in color.
As food for humans
The fruit is not an important food on Socotra. The pithy tissue lying under the skin and around the seeds of larger ripe fruits is the only part eaten. The seeds are said to be bitter, caustic and to cause sores on the tongue. The skin of the unripe fruit is extremely sour.
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As food for livestock
In the well vegetated areas of the island the foliage is little grazed, except in a prolonged dry season, when the fallen dead leaves are eaten. In drier areas, goats eat the leaves and especially the new shoots of smaller and more prostrate shrubs, while sheep eat dry plant litter. It is not palatable to cattle. Goats are fond of the immature fruit and small livestock also like the flowers, fresh or dried.
Medicinal use
The skins of the fruit are crushed, cooked and the paste applied to treat sores and wounds. Alternatively they are dried and crushed to a powder which is applied topically to treat skin sores in the same way. Occasionally people eat the seeds as a purge to relieve stomach ache. More recently people have started using the skins to treat stomach complaints and expel worms, a treatment apparently learned from the mainland.
Other uses
The skin of a pink-colored, unripe fruit, rather than a fully ripe red one, is crushed in water and added to a small amount of fresh milk to sour it. The soured milk is then used to curdle fresh milk before churning it to make butter.
Wood
The wood is hard and close-grained and used to make small implements. The straight branches of larger specimens are used to make herding staffs. Makes good timber and is termite resistant, but it is usually of too small diameter to be useful for anything other than roofing infill. Branches are used to make protective or concealing covers for waterholes and rock cisterns. and the wood is considered to be as durable and strong as the wood of Buxanthus pedicellatus for this purpose. Dead wood makes good firewood making little smoke and giving out good heat. Dead wood also makes good charcoal.
Distribution
In addition to its natural distribution in Socotra, it has also been planted in Hawaii at the Koko Crater Botanical Garden.