Tinkturenpresse

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Gyrinops walla Gaertn. - Thymelaeaceae - wallaha (sinhala), wallapatta tree, silani

Endemic tree of Sri Lanka; up to 15m high; bark thin, brownish-grey; leaves alternate, oblong, shiny dark green; flowers small,  yellowish-white.

"Gyrinops walla has been assessed as vulnerable on the IUCN Red List, due to its harvesting for agarwood. The species does occur in one protected area of Sri Lanka: Sinharaja Forest Reserve." [[https://en.wikipedia.org/wiki/Gyrinops_walla|wikipedia]]

"The stem colour of G. walla is off white to pale yellow. However, the tissues which produced agarwood resins
due to injuries become dark in colour... GC analysis revealed that the resin of G. walla contained aroma compounds commonly found in commercially available agarwood... Sesquiterpenes of guaiane and eudesmane skeleton were also present in G. walla resin... According to Yoneda et al. (1984), oxo-agarospirol and
jinkoh-eremol are found in all types of agarwood. Even though the presence of these compounds was lower in
the analysed G. walla samples of the current study, they are important markers in identifying agarwood aroma.
These compounds are known to produce characteristic camphor like aroma with woody and floral notes (Ishihara
et al., 1991). However, these resins tested were found to lack agarofuran, vetivae sequiterpenes and chromone
derivatives, which are key components of the resin formed in Aquilaria species (Naf et al., 1993)." \\
Resin extracts contained e.g. jinkho-eremol (0.4-0.7%), selina-3,11-diene-9-one (0.5-4.8%), selina-3,11-diene-14-al (3.9-7.8%), 9,11-eremophiadiene-8-one (0.8-2.7%), guaia-(10),11-diene-15-ol (1.4-2.6%), and oxo-agarospirol (0.7-1.6%). \\
[Subasinghe, S., Hettiarachchi, D. "Agarwood resin production and resin quality of Gyrinops walla Gaertn." (2013)]


{{:gyrinops_wal.jpg|Gyrinops walla}} \\
Gyrinops walla, Minuwangoda, Sri Lanka (2023) © Shevon Wijegunarathne [[https://creativecommons.org/licenses/by-sa/4.0/|CC BY-SA 4.0]] [[https://www.inaturalist.org/observations?taxon_id=1041159|inaturalist.org]]