The Difference Between Aquilaria and Gyrinops: An Honest Comparison

Oud is produced mainly from two sibling botanical genera: Aquilaria and Gyrinops. And because the question "what is the difference between them?" recurs so often, we devote to it this article as a frank comparison. And the conclusion that we build upon from the beginning: the two genera are very close, from a single botanical family, and both produce real oud; so the difference between them is taxonomic and geographical in its essence more than it is a difference in quality or authenticity. We wrote this at Oud Treasure in an honest language: we mention what the sources support with reservation, and we do not invent decisive formal differences nor scent fingerprints nor a chemical composition according to the genus.

1. Two sibling genera

Before we compare, the foundation must be fixed: Aquilaria and Gyrinops are not two distant genera, but two sibling genera that belong — as the botanical sources mention — to the same family Thymelaeaceae. And both produce oud by the same general mechanism: a pale, light wood in its origin, transforming in response to the wounding of the tree and its infection with a fungal infection into a dark, heavy wood saturated with the aromatic resin, which is what we call oud.

And this closeness is the key to understanding all that will come. For when we talk about the "difference" between the two genera, we are talking about fine differences between two relatives, not a divergence between two strangers. And for this it is often difficult for the non-specialist to distinguish between them by looking at the wood alone. Whoever wants the expanded introduction to the first genus should see what is the Aquilaria tree, and whoever wants the introduction to the second genus should see what is the Gyrinops tree; as for here, we suffice with the comparison between them without repeating the detail of each genus.

And the most famous difference that is mentioned between the two genera is the geographical tendency: for the presence of Aquilaria tends toward continental Southeast Asia and the western parts of the archipelago, while the presence of Gyrinops stands out in the east of the Indonesian archipelago. But this — as we will affirm repeatedly — is a general direction gleaned from the reviews, not a decisive separating line. And we detail this tendency in the distribution section below.

2. The comparison table

The following table summarizes the main aspects of the comparison between the two genera. And we repeat the note that everything concerning the number of species and the distribution is formulated in indicative expressions, built on what is repeated in the reviews, not on a field measurement that we conduct; for the numbers in the botanical classification vary between the sources, and the geographical boundaries overlap:

This table is read as a general map of the differences, not a decisive separation. For the most prominent thing in it is that the last row — "Does it produce oud?" — answers "yes" in both columns; and this is the essence of the comparison: the two genera share in the family and in producing real oud, and they diverge in the details of distribution and classification that we review in the following sections.

3. The distribution: west versus east

The clearest practical difference that is mentioned between the two genera is the geographical tendency. For according to what the reviews indicate, the species of Aquilaria tend toward a wider presence in continental Southeast Asia (the Indochina range and the Malay Peninsula) and the western parts of the archipelago such as Sumatra and Borneo. While the presence of Gyrinops stands out in the east of the Indonesian archipelago — in regions such as Nusa Tenggara (the Lesser Sunda Islands), Maluku, and Papua, reaching to the range of New Guinea.

But this division "west for Aquilaria and east for Gyrinops" is a useful simplification, not a strict rule. For the distribution overlaps, and the precise boundaries of each genus remain a subject of scientific detail we are not decisive about. And therefore we say that each genus "is mentioned as tending" toward a direction, and we do not say that every western oud is Aquilaria or every eastern oud is Gyrinops. Whoever wants the wider map of the habitats of oud trees in general finds it in where oud grows.

And what is important here is distinguishing between two levels that often mix: the geographical origin (from where the oud actually came) and the botanical genus (Aquilaria or Gyrinops). For they may be close in the eastern origins, without necessarily matching; since it is not precluded that species of one genus exist in a range in which the other predominates. Therefore the linking of the origin to the genus remains indicative, a part of the scientific honesty that we commit to.

4. The kinship and the reclassification

The closeness of the two genera is not merely formal, but a close botanical kinship that manifested in the history of their classification. For the classification of Aquilaria and Gyrinops witnessed reviews in botany, and it is mentioned that species have undergone reclassification or were moved between the two genera with the progress of the study. And this in itself is evidence that the boundaries between them are not sharp as may be thought.

And we formulate this with deliberate reservation: for we do not establish a list of particular species that "moved" from one genus to another, nor are we decisive about taxonomic details that go beyond what has settled in the references; since these matters occupy the specialists themselves and evolve with the research. What we say with confidence is that the botanical classification is a renewing process not settled once, and that the closeness of the two genera made the separation between them a subject of repeated scientific review.

And the fruit of this understanding is that we deal with the "difference between the two genera" as a difference between two relatives whose classification evolved, not a fixed engraved truth. For whoever is decisive to you that a genus is "radically different" from the other goes beyond what the close botanical kinship between them supports. And the more correct thing is to say: two sibling genera, their boundaries precise, and their classification a subject of continuous study.

5. Does the oud differ between them?

This is the question that occupies the buyer more than any other: is the oud of Aquilaria finer than the oud of Gyrinops or the reverse? And the honest answer is clear: the botanical genus is not a classification of quality. For both genera produce real oud, and the judgment on the quality is only by the grade, the density of the resin, and the sensory character, not by the belonging of the tree to this genus or that.

As for the difference of the sensory character — the scent and the breath — we pause at it with caution. For a character is sometimes attributed to the oud of the eastern origins (in which Gyrinops is mentioned) that is described as quieter or smoother, but we do not make of this a botanical rule that links the scent to the genus; for the scent is affected by the origin, the infection, the grade, and the manner of heating more than it is affected by the genus alone. And two pieces of a single genus may differ in scent, and two pieces of two genera may be close. Whoever wants the detail of the character of Indonesian oud and its variation by origin finds it in the characteristics of the scent of Indonesian oud.

So the conclusion is that what distinguishes one oud from another is not its botanical genus in the first place, but its testable characteristics. And whoever sells you an oud as "finer" merely for its attribution to Aquilaria rather than Gyrinops (or the reverse) goes beyond what the botanical knowledge supports. Authenticity is not measured by the genus, and quality is measured by the grade, the resin, and the scent.

6. Why distinguishing is difficult

If the two genera are this close, then how do we distinguish between them in the first place? The honest truth is that distinguishing between the two genera at the level of a piece of oud is actually difficult. For the species are close in shape (a clear morphological overlap), and often the oud reaches the market cut and treated far from the mother tree, so the botanical clues (such as the leaves, the flowers, and the fruits) that are relied upon in the classification are lost.

And the sources mention that the precise determination of the genus or the species needs scientific methods that go beyond the look and the smell: morphological methods (examining the plant's formal features, which are often not available in the cut wood), and chemical (analyzing the compounds), and genetic (DNA analysis, which is the most precise but it is purely laboratory-based). And all of them are laboratory tools, not market ones. And we devote to the methods of determining the species an independent axis in this guide, and another to the tools of the morphological, chemical, and genetic examination in expansion.

And for this we warn against the claim of determining the botanical genus by the look or the smell alone; for that is not possible with precision. What we commit to on the quality control page is examining the grade and the density of the resin and verifying the claims of the origin within the supply chain — not conducting a laboratory determination of the botanical genus, nor do we claim that. We examine what we are able to examine, and we are truthful in what we do not examine.

7. What does this mean for the buyer

What does the buyer benefit from all this? The first practical lesson: do not over-rely on the botanical genus. For knowing that the oud is from Aquilaria or Gyrinops is a knowledge that enriches your understanding, but it does not settle the buying decision — especially since distinguishing between the two genera, as we saw, is difficult in the first place at the level of the piece, and the genus is not a classification of quality.

The more worthwhile thing is that you rely on what can be verified: from which origin the oud came, and which grade it is, and how you smell it yourself. These are the criteria upon which the value of oud is actually built, and they are what we guide you to in how to choose an authentic Indonesian oud. And distinguishing the name of the origin from the botanical species helps you to read the circulated names, which we detail in the region name versus the species.

And because the scent is an experience that no botanical genus nor scientific name describes, the best thing to start with is a sample by which you test the origin, the grade, and the character directly. We provide for this the samples service, and a wider entrance to oud from its sources in the Indonesian oud collection. And to place this comparison in its wider context among the oud-producing trees, return to the botanical guide to the species of oud trees. For the botanical knowledge illuminates your path, but the sense of smell is the final judge.