Agonandra

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Agonandra

Description

Dioecious trees or shrubs, sometimes vinelike. Leaves glabrous. Inflorescence a raceme with 1-3 flowers per bract, bracts peltate, bracteoles minute, rachis glabrous or puberulous. Flowers pedicellate, 4-5-merous, unisexual; tepals free, glabrous or puberulous; stamens with filiform filament, exceeding the perianth; disc lobed or annular to urceolate; pistil with sessile stigma, in male flowers pistil rudimentary. Drupe ellipsoid, to 2.5 cm long.

Distribution

Central and South America: present Guianas: present
About 10 species in Central and South America, 2 of which occur in the Guianas.

Wood observation species

A. silvatica

Wood


Vessels diffuse, solitary with only incidentally two pores connected, round to oval, 10(5-13) per sq. mm, diameter 101(64-144) μm. Vessel-member length 400(200-550) μm. Perforations simple. Intervascular pits not observed. Vessel-ray and vessel-parenchyma pits half-bordered, sometimes coalescent, 830 μm. Occasionally small round or oval perforations are found. Tracheids scanty.
Rays homogeneous, uni- and 2-3-seriate, 3-4 per mm, uniseriate rays less than 5%, composed of procumbent cells, multiseriate rays composed of strongly procumbent cells with incidentally one row of weakly procumbent margin cells, height 650-800 μm.
Parenchyma apotracheal, diffuse-in-aggregates, in strands of two cells. Fibres thick-walled, walls 5-12 pm, lumen 1-2 μm. Pits distinctly bordered, frequent on tangential and radial walls, (4-)5-6 μm. Length 2400(1450-3060) μm. F/V ratio 5.5.
The description is based on material of A. silvatica from Surinam. Although the species of Agonandra differ in some quantitative characters, the wood anatomy of the genus as a whole is very homogeneous in all qualitative characters. Within the Opiliaceae, it is the only genus in the wood of which cystoliths have never been reported (Koek-Noorman & Rijckevorsel, 1983).