Nomenclature etc. RUTACEAE. Syn.: Zanthoxylum riedelianumEngl. Trade and local names: tembetary sa'y ju (PY). Not protected under CITES regulations.
Tree. Geographic distribution: southern Brazil.
General. Growth ring boundaries distinct. Growth ring boundaries delimited by a 2–4 seriate marginal parenchyma band. Heartwood without streaks.
Vessels. Vessels present. Wood diffuse-porous. Vessels arranged in no specific pattern, in multiples, commonly short (2–3 vessels) radial rows. Vessel outline rounded. Two distinct vessel diameter classes absent. Average tangential vessel diameter 40–75–110 µm; diameter of vessel lumina: medium. Average number of vessels/mm² 22–24–26; vessels per square millimetre moderately numerous. Perforation plates simple. Intervessel pits alternate, average diameter (vertical) 6–8 µm, small and medium, not vestured. Vessel-ray pits with distinct borders, similar to intervessel pits, of uniform size or type, of the same type in adjacent elements, located throughout the ray. Helical thickenings absent. Tyloses in vessels absent. Other deposits in heartwood vessels present, brown organic contents in some vessels.
Tracheids and fibres. Vascular or vasicentric tracheids sporadic to absent. Fibres very thin-walled. Fibre pits common in both radial and tangential walls, simple to minutely bordered. Helical thickenings absent. Fibres non-septate.
Axial parenchyma. Axial parenchyma present, banded. Axial parenchyma bands marginal (or seemingly marginal), fine, up to three cells wide. Axial parenchyma apotracheal and paratracheal. Apotracheal axial parenchyma diffuse. Paratracheal axial parenchyma scanty and unilateral. Axial parenchyma as strands. Average number of cells per axial parenchyma strand 2–4(–5). Unlignified parenchyma absent. Apotracheal parenchyma frequently crystalliferous.
Rays. Rays present, 2–4–5 per tangential mm, multiseriate (also if only few), (2–)3–4(–5) cells wide, narrow (2–3 seriate) and of medium width (3–5 seriate). Rays with multiseriate portions as wide as uniseriate portions absent. Aggregate rays absent. Rays of one size. Height of large rays commonly 500 to 1000 µm. Rays composed of a single cell type (homocellular); homocellular ray cells procumbent. Sheath cells absent. Tile cells absent. Perforated ray cells absent. Disjunctive ray parenchyma end walls indistinct or absent. Only few rays heterocellular.
Storied structures. Storied structure absent.
Secretory structures. Oil and mucilage cells absent. Intercellular canals present, traumatic origin, axial type, in long tangential lines. Laticifers or tanniniferous tubes absent.
Cambial variants. Included phloem absent. Other cambial variants absent.
Mineral inclusions. Crystals present, prismatic, located in ray cells and axial parenchyma cells. Crystal-containing ray cells procumbent. Crystals in procumbent ray cells not in radial alignment. Crystal-containing axial parenchyma cells chambered and not chambered. Number of crystals per cell or chamber one and more than one. Crystals in one cell or chamber of the same size and of two distinct sizes. Crystal containing cells of normal size. Cystoliths absent. Birefringent crystalline substances of irregular form (not prismatic) present in both axial and radial parenchyma cells. Silica not observed.
Illustrations. • Transverse section. Fagara riedeliana. • Transverse section trc. Fagara riedeliana. Traumatic intercellular canals in tangential bands. • Tangential section. Fagara riedeliana. • Radial section. Fagara riedeliana.
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’.