Emmotum

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Emmotum

Description

Trees or shrubs; branches pubescent, glabrescent. Leaves usually coriaceous, arcuately veined; veins conspicuously parallel. Inflorescences axillary short fascicled panicles with minute bracts. Flowers small, perfect, 5-merous, articulate below calyx to the short pedicel; calyx campanulate, with imbricate lobes, persistent; petals free, valvate, fleshy, usually sericeous outside, lanate on prominent midrib inside, apex inflexed, minute, glabrous; stamens free, glabrous, filaments flattened, fleshy, anthers ovate-oblong, basifixed or nearly so, thecae longitudinally dehiscent, extrorse, connective fleshy, bilobed or cordate at base; ovary globose or somewhat compressed, hirsute or glabrous, 3- or sometimes 2-celled, often with glabrousfleshy disk-like base; ovules 2 per locule, hanging, collateral; style terminal or eccentric, glabrous, stigma small, capitate or slightly 3-lobed. Drupe globose, dorso-ventrally compressed, asymmetric, ribbed,endocarp with a thick ornamented wall, usually with only one curved seed.

Distribution

Southern America:
About 10 species in northern South America, mainly in the Amazon Basin; 3 species in the Guiana and 3 species possibly to be expected.

Wood observation species

E. fagifolium

Wood

Vessels diffuse, solitary, round to slightly oval, 9-13 (8-14) per sq. mm, diameter 90-130(80-175) μm. Vessel-member length: 1336-1555 (882-1967) μm. Perforations scalariform, 5-9(-12) bars per plate. Inter- vascular pits alternate, round, 5-6μm. Vessel-ray and vessel-parenchy- ma pits similar to the intervascular pits.
Rays in two types, 5-7 per mm, uni-biseriate, up to 1000-1350 μm (= 26-41 cells) high, heterogeneous, composed of upright, square and some procumbent cells; and multiseriate, 10-12(-16) cells wide, over 7500 μm (= over 150 cells) high, often with uniseriate tails, hete- rogeneous, composed of procumbent, some square and a few upright cells. Sheath cells scarce. Rhombic crystals present in (procumbent) ray cells.
Parenchyma apotracheal in short, wavy, tangential bands, one cell wide, and diffuse, and some scanty paratracheal cells. Strands 8-12 cells.
Fibres non-septate, lumen 8-13 μm, walls 8-13 μm. Pits bordered, on radial and tangential walls, 9-12μm in diameter. Length: 2127-2386 (1705-3087) μm. FIV ratio: 1.40-1.79.