| | Commercial timbers |
Nomenclature etc. VOCHYSIACEAE. Q. dinisii, Q. paraensis, Q. parviflora, Q. rosea. Trade and local names: mandioqueira (BR), florecillo (sAm). Not protected under CITES regulations.
Description based on 11 specimens. Tree. Geographic distribution: Mexico and Central America, tropical South America.
General. Heartwood basically brown, red (pinkish brown to reddish brown). Sapwood colour similar to heartwood colour, or distinct from heartwood colour. Density 0.5–0.75 g/cm³.
Vessels. Wood diffuse porous. Vessels in multiples, commonly in short (2–3 vessels) radial rows. Average tangential vessel diameter 151–283 µm. Average number of vessels/mm² 4–12. Average vessel element length 350–510 µm. Perforation plates simple. Intervessel pits alternate, average diameter (vertical) 5–8 µm, pits vestured. Vessel-ray pits with distinct borders, similar to intervessel pits.
Tracheids and fibres. Fibres of medium wall thickness. Average fibre length 1170–1500 µm. Fibre pits mainly restricted to radial walls, simple to minutely bordered. Fibres septate and non-septate.
Axial parenchyma. Axial parenchyma banded. Bands not marginal (or seemingly marginal). Apotracheal axial parenchyma diffuse-in-aggregates. Paratracheal axial parenchyma vasicentric, or aliform. Aliform parenchyma of the lozenge type. Axial parenchyma as strands. Average number of cells per strand: 3–8.
Rays. Rays 5–8 per tangential mm, multiseriate, 3–6 cells wide. Height of large rays commonly over 1000 µm. Rays composed of a single cell type (homocellular), or two or more cell types (heterocellular); homocellular ray cells procumbent. Heterocellular rays with square and upright cells restricted to marginal rows, mostly 1 marginal row of upright or square cells.
Secretory structures. Intercellular canals present, traumatic origin, oriented axially.
Mineral inclusions. Crystals present, prismatic, located in axial parenchyma cells. Crystal-containing axial parenchyma cells chambered. Number of crystals per cell or chamber one. Silica present or not observed, as grains; in rays cells.
Physical and chemical tests. Heartwood not fluorescent. Water extract not fluorescent; colour of water extract yellow. Ethanol extract not fluorescent. Colour of ethanol extract colourless to brown. Chrome azurol-S test positive.
Illustrations. • Macroscopic images: cross section. transverse (ca. 10x). • Macroscopic images: wood surface. surface (natural size). tangential. radial. • Transverse section. Qualea rosea. • Tangential section. Qualea rosea. • Radial section. Qualea rosea.
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: 9th April 2019. delta-intkey.com’.
