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H. G. Richter and M. J. Dallwitz

Pera glabrata (Schott) Baill. (Pilón rosado)

Nomenclature etc. EUPHORBIACEAE. Trade and local names: pilón rosado (PY). Not protected under CITES regulations.

Description based on 5 specimens. Tree. Geographic distribution: Caribbean, or Mexico and Central America to tropical South America.

General. Heartwood basically white or grey. Sapwood colour similar to heartwood colour. Density 0.55–0.8 g/cm³.

Vessels. Wood diffuse-porous. Vessels arranged in no specific pattern, in multiples, commonly short (2–3 vessels) radial rows or radial rows of 4 or more. Average tangential vessel diameter 120–180 µm. Average number of vessels/mm² 5–8. Average vessel element length 350–850 µm. Perforation plates simple. Intervessel pits alternate, average diameter (vertical) 9–11 µm. Vessel-ray pits with distinct borders, similar to intervessel pits. Helical thickenings absent. Tyloses in vessels absent. Other deposits in heartwood vessels present (crystals in tyloses).

Tracheids and fibres. Fibres of medium wall thickness. Average fibre length 1044–1674 µm. Fibre pits mainly restricted to radial walls, simple to minutely bordered. Fibres non-septate.

Axial parenchyma. Axial parenchyma banded. Axial parenchyma bands fine, up to three cells wide. Axial parenchyma as strands. Average number of cells per axial parenchyma strand 5–8.

Rays. Rays 10–15 per tangential mm, exclusively uniseriate. Rays composed of two or more cell types (heterocellular). Heterocellular rays with square and upright cells restricted to marginal rows, mostly 1 marginal row of upright or square cells.

Storied structures. Storied structure absent.

Secretory structures. Intercellular canals absent.

Cambial variants. Included phloem absent.

Mineral inclusions. Crystals present, prismatic, located in axial parenchyma cells and tyloses. Crystal-containing axial parenchyma cells chambered. Number of crystals per cell or chamber one. Silica not observed.

Physical and chemical tests. Heartwood not fluorescent. Water extract fluorescent, or not fluorescent; basically colourless to brown or shade of brown. Ethanol extract not fluorescent. Colour of ethanol extract colourless to brown or shade of brown.

Illustrations. • Transverse section. Pera glabrata. • Tangential section. Pera glabrata. • Radial section. Pera glabrata. • Tyloses in vessels. Pera glabrata. Thick-walled sclerified tyloses frequently present in this species.


The interactive key allows access to the character list, illustrations, full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting specified attributes, summaries of attributes within groups of taxa, and geographical distribution.

Cite this publication as: ‘Richter, H.G., and Dallwitz, M.J. 2000 onwards. Commercial timbers: descriptions, illustrations, identification, and information retrieval. In English, French, German, Portuguese, and Spanish. Version: 25th June 2009. http://delta-intkey.com’.

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