Siphoneugena (Siphoneugena)
Description
Siphoneugena is a genus of the botanical family Myrtaceae, first described as a genus in 1856. It is native to Central and South America as well as the West Indies. They are shrubs or trees; variously hairy, simple hairs, straight, recurved or contorted. Compressed, hairy or glabrous twigs. Opposite leaves, petiolate; glabrous or thinly hairy when young, finally glabrous or with some persistent hairs; middle convex vein on both surfaces or flattened in the beam; lateral veins ascending, thin, frequently inconspicuous on one or both surfaces of mature leaves; marginal ridges similar to lateral veins, straight, 1-2 mm from the margins; petioles ribbed or sulcate. Axillary, racemose or fasciculate inflorescences; buttons often contracted above the ovary. Sessile or pedicelled flowers; bract it persistent or deciduous after anthesis. Flowers with the hypanthium prolonged forming a cup-like structure above the ovary, closed on the button or open at the apex, splitting between the wolves of the chalice and becoming reflected in the anthesis, circumcised in the ovary and cleanly dehiscent after the before, the hypanthum and the stamens detaching as a unit; wolves of chalice 4, valvados, subequal or in markedly unequal pairs; petals 4, white, hairy on both surfaces; stamens 50-200, anthers 0.3-0.5 mm; 2-locular ovary; ovules (2-) 3-5 (-7) per locule.
Taxonomic tree
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Domain: Eukarya
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Kingdom: Plantae
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Phylum: Magnoliophyta
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Class: Magnoliopsida
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Order: Myrtales
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Family: Myrtaceae
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Genus: Siphoneugena
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