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Department of Botany

Since 1980



Psidium guajava L.

Myrtaceae

Koyya

   Botanical NamePsidium guajava L.
   SynonymsGuajava pyrifera. (L.) Kuntze, Myrtus guajava Var. pyrifera (L.) Kuntze
   FamilyMyrtaceae
   Common NameEnglish : Guava / Tamil : Koyya
   DistributionGlobal : Tropical America, Australia, New Zealand, Asia and Africa.
Indian : Mahrashtra, Karnataka, Tamil Nadu and Kerala
   DescriptionSmall tree up to10 m height. Stem smooth with pealing bark. Young stem 4-angled. Leaves simple, elliptic-oblong, apex acute, lateral nerves prominent. Inflorescence Axillary Cymes. Flower White, 1-3-flowered, tetramerous, Complete, Bisexual, Epigynous. Calyx tube 4-9 mm long, ovoid, densely hirsute; lobes 4, united and closed in bud. Petals 4, white, broadly ovate, caducous. Stamens many. Ovary globose, many-celled, ovules numerous, style subulate. Berry globose, crowned by persistent calyx lobes. Seeds many, embedded in fleshy pulp.
   Flowering Fruiting periodJune-July/November-January
   UsesFruit edible commercial crop. Wood is resistant to insect and fungal attack used as timber for making small furniture‚Äôs.
   Medicinal UsesUsed to treat inflammation, diabetes, hypertension, caries, wounds, pain relief, fever, diarrhoea, rheumatism, lung diseases, and ulcers.
   Tamil NameKoyya