Aloysia gratissima (Gillies & Hook.) Tronc

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Aloysia gratissima (Gillies & Hook.) Tronc. is a species native to south-western USA, Mexico, Brazil, Bolivia, Paraguay, Uruguay and north-eastern Argentina.

Common names: Beebrush, White-brush.

The generic name “Aloysia” has been dedicated by the botanist Palau y Verdera (1734-1793) to Maria Lisa, Princess of Parma (1751-1819), wife of Charles IV, King of Spain. The specific epithet “gratissima” comes from Latin and means “the most pleasant”.

Aloysia gratissima is a very ramified shrub, very aromatic, up to 3 m tall, with quadrangular branches and greyish bark. The leaves on short petioles of 1-3 mm, are opposite, elliptic-lanceolate, about 3 cm long and less than 1 cm broad, but often smaller, usually united in groups along the stems. The upper pagina is rough and opaque green, the lower pagina is provided with rigid bristles, the margin is entire or toothed. The inflorescences are single axillary grapes or axillary panicles that elongate beyond the leaves, two or more per node, occasionally one, 4-8 or more, cm long. The flowers emit an intense vanilla scent and present ovate-elliptic, occasionally linear, bracts. They are small, slightly pedicellate, hermaphrodite, zygomorphous, of white colour, at times bluish. The calyx is formed by short sepals, bristly with four teeth; the corolla, hairy outside, is gamopetalous, shaped like a thin funnel, that opens in 4 lobes. The flowers appear from March to November, especially after the rains, and with their scent do attract many species of butterflies but also the bees, who, from the nectar do produce a delicious honey. The fruit is a schizocarp that divides in 2-4 mericarps.

Aloysia gratissima - Monaco Nature Encyclopedia

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