Peltogyne mexicana

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Peltogyne mexicana
Purpleheart wood.jpg
Peltogyne mexicana wood
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Genus: Peltogyne
Species:
P. mexicana
Binomial name
Peltogyne mexicana
Martínez
Mexico states guerrero.png
Natural range of the Peltogyne mexicana species

Peltogyne mexicana is a species of tree that belongs to the family Fabaceae. Members of the genus Peltogyne are commonly known in different regions as purpleheart, morao, nazareno, violeta, pau roxo, or palo morado. The genus Peltogyne is neotropical and is made up of 23 species. Peltogyne mexicana occurs in Guerrero, Mexico, and is one of the northernmost species in the genus. [2]

Contents

Many of the vernacular names derive from the characteristic of the color of the wood, which is unusually purple in the center. The coloration darkens and intensifies with exposure to air and ultraviolet (UV) light; if it is put in water for a few hours, the purple color changes to intense black. Peltogyne mexicana is considered a precious wood. [2]

Classification and description

The flowers are grouped in inflorescences, from 5 to 8 cm, with peduncles and densely ferruginous-pubescent pedicels. The flowers are white, aromatic, 8 mm in diameter, with the surface covered with beautiful whitish; with four sepals of which only three are visible outside the button, slightly violet or chestnut colored, 3 mm; with five elliptical petals 5 mm long by 2 to 2.5 wide; with 10 stamens, of which five are greater than 7 mm and alternate with the others (5 to 6 mm), are all fertile, with white filaments. The fruit is oblique, compressed, from 3 to 4 cm, with the apex rounded. It is usually covered by a kind of very sticky sap. [3] [4] It flowers in August and is pollinated by insects. [5]

Distribution and environment

This tree was reported as a new botanical species by Maximino Martínez in 1960. [2]

The distribution of P. mexicana is in Guerrero, Mexico. P. mexicana is a geographic outlier, with most other members of the genus found in South America. [2]

Wood

This species is prized for its beautiful heartwood which, when cut, quickly turns from a light brown to a rich purple color. Exposure to ultraviolet (UV) light darkens the wood to a brown color with a slight hue of the original purple. [6] This effect can be minimized by treating cut wood with a finish or sealant containing a UV inhibitor. The dry timber is very hard, stiff, and dense with a specific gravity of 0.86 (860 kg/m3 or 54 lb/cu ft). Purpleheart is correspondingly difficult to work with. [7]

Uses and hazards

Purpleheart is prized for use in fine inlay work, especially on musical instruments, guitar fret boards, woodturning, cabinetry, flooring, and furniture. The timber is also valuable in applications that require toughness, such as truck decking. [8]

Exposure to the dust, generated by cutting and sanding purpleheart, can cause irritation and nausea, possibly due to the presence of dalbergione (neoflavonoid) compounds in the wood, [9] limiting purpleheart's use for crafts. Purpleheart is also a fairly expensive wood, which is why it is usually used in smaller-scale projects. [10]

State of conservation

This species has a category of Endangered species (A) according to NOM-059-ECOL-2010, caused in part by overexploitation and deforestation and compounded by its slow growth. [11] [4]

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References

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  2. 1 2 3 4 Sotuyo, Solange (1 April 2014). "El palo morado (Peltogyne mexicana), una leguminosa maderable con futuro incierto y parientes lejanos" (PDF). Revista Digital Universitaria, Universidad Nacional Autónoma de Mexico (in Spanish). 15 (4). ISSN   1607-6079.
  3. CONABIO. 2009. Catálogo taxonómico de especies de México. 1. In Capital Nat. México. CONABIO, Mexico City.
  4. 1 2 "Palo morado". Enciclopediagro.org (in European Spanish). Retrieved 6 November 2017.
  5. Interián-Ku, Víctor Manuel; Borja de la Rosa, María Amparo; Valdez-Hernández, Juan Ignacio; García-Moya, Edmundo; Romero-Manzanares, Angélica; Vaquera-Huerta, Humberto (2011). "Características anatómicas y propiedades físicas de la madera de Caesalpinia gaumeri Greenm en Dzan, Yucatán". Madera y Bosques. 17 (1): 23–36. doi: 10.21829/myb.2011.1711152 . ISSN   1405-0471.
  6. "PURPLEHEART-PELTOGYNE". Maderasdesudamerica.com.
  7. Garnet Hall (February 2006). The Art of Intarsia: Projects & Patterns. Tamos Books, Incorporated. pp. 16–. ISBN   978-1-895569-75-9.
  8. "Purpleheart Wood". Thewoodbox.com.
  9. Peltogyne in BoDD – Botanical Dermatology Database
  10. J. L. Atrops (1970). Strength Properties of Trinidadian Timbers. University of the West Indies.
  11. Juárez, Alejandro; Benítez Villasana, José Ignacio; García Sánchez, Silverio (July–December 2013). "Time of Gathering in Palo Morado (Mexican Peltogyne M.) in Acapulco Gro., Mexico". Revista Iberoamericana para la Investigación y el Desarrollo Educativo (RIDE). 4 (7). ISSN   2007-7467.