At a glance
RECORDED PROFILE DATA- Genus size
- Angraecum contains over 200 species across tropical Africa, Madagascar, and the Indian Ocean islands.
- Common award abbreviation
- AM = Award of Merit (AOS or RHS).
- Key diagnostic measurement
- Spur length distinguishes many Angraecum species; e.g., 0.7 cm for A. aporoides.
Why a Label Matters
Orchid labels are more than a name tag; they are a compact record of taxonomy, horticultural merit, and sometimes the diagnostic measurements that prove a plant’s true identity. For Angraecum – a genus of over 200 species ranging from tropical Africa to Madagascar – a correct label helps you:
- Confirm you have the species (or hybrid) you intended to buy.
- Track award status such as an AOS Award of Merit (AM) or RHS recognition.
- Understand any special horticultural notes that may be attached to a cultivar.
- Provide the Society for the Identification of True Forms (SITF) with the data it needs to verify the plant.
Mis‑read or missing labels are a leading cause of misidentification in the hobby, especially with frequently mislabeled species like Angraecum infundibulare [[2]].
Typical Layout of an Angraecum Label
Most commercial or society labels follow a predictable order. The exact format can vary, but you will usually see the following elements:
- Genus and species (italicised, e.g., Angraecum sesquipedale).
- Authority – the botanist who first described the species (often omitted on retail tags).
- Hybrid formula or cultivar name (if applicable).
- Award or registration codes such as AM, RHS, AOS, etc.
- Diagnostic measurements – ovary length, spur length, etc., when the plant is part of a SITF submission.
- Origin or provenance – collector, nursery, or geographic source.
Understanding each piece lets you read the label like a short botanical report.
Decoding the Scientific Name
The first line is always the genus followed by the specific epithet. In Angraecum the genus is pronounced “an‑GREY‑kum” or “an‑GRYE‑kum” [[1]]. Example:
<em>Angraecum sesquipedale</em>If a cultivar or hybrid is listed, it appears after the species name, often in single quotes for a cultivar or with a “×” for a hybrid:
- Cultivar: Angraecum sesquipedale ‘Grand Bleu’
- Hybrid: Angraecum × Jumellea ‘Sunset’
Hybrid formulas may list parent species in parentheses, e.g., Angraecum × Jumellea (A. sesquipedale × J. fragrans). Knowing the “×” symbol signals a hybrid is essential for correct identification.
Award and Society Abbreviations
Orchid societies use standard abbreviations on labels to indicate awards or registration status. The most common are:
- AM – Award of Merit from the American Orchid Society (AOS) or the Royal Horticultural Society (RHS) when the award comes from the latter, shown as AM/RHS [[1]].
- RHS – Royal Horticultural Society registration, often accompanied by a RHS number.
- AOS – indicates the plant has been entered in the AOS registry.
- SITF – Society for the Identification of True Forms; the label may include a note that the plant is under review or has been confirmed as a particular species [[4]].
These codes are usually placed in parentheses after the name, for example: Angraecum sesquipedale (AM/RHS).
Diagnostic Measurements on SITF Labels
When a plant is submitted to SITF, the label includes precise floral measurements that help distinguish closely related taxa. Typical data points are:
- Ovary length (e.g., 0.3 cm) – the length of the ovary before flowering.
- Spur length (e.g., 0.7 cm) – the nectar‑bearing spur, a key character in Angraecum sections.
- Flower spread – overall width of the open flower.
These numbers are used in the SITF key to separate species such as Angraecum aparoides (spur ≈0.7 cm) from A. bancoense (spur 0.25‑0.5 cm) [[4]]. If you see such measurements on a label, the plant has likely been examined by a specialist and the data can be cross‑checked with published keys.
Physical Label Best Practices
Even the most accurate information is useless if the label falls off or fades. The South Coast Orchid Society recommends:
- Use durable, water‑resistant material (e.g., premium white vinyl) that lasts at least five years.
- Write with a pencil rather than ink pens, because ink can smear and fade.
- Leave space on both sides for growth notes (bloom dates, repotting) and for a small hole to hang the label on hanging mounts.
- Secure the label so new growth cannot push it out of the pot.
Following these guidelines reduces the risk of losing critical identification data during the growing season [[9]].
Common Pitfalls & How to Avoid Them
| Issue | What It Looks Like | How to Resolve |
|---|---|---|
| Mis‑spelled genus | “Angraecum” written as “Angraecun” | Cross‑check with a reliable source; the correct spelling is Angraecum (an‑GREY‑kum) [[1]]. |
| Hybrid listed as species | Label reads Angraecum ‘Sunset’ without an “×” | Verify whether the name is a registered cultivar (cultivar names are in single quotes) or a hybrid (requires “×”). |
| Missing award code | Plant has an AOS registration number but no AM/RHS designation | Check the AOS database; a plant may have been entered but not yet awarded. |
| Out‑of‑date measurements | Ovary length listed from a juvenile plant | Remember that measurements on SITF labels are taken from mature, flowering specimens; juvenile data are not reliable for identification. |
Quick Checklist for New Angraecum Purchases
- Read the first line: Angraecum + species epithet.
- Look for a “×” or single‑quote to identify hybrids or cultivars.
- Note any award codes (AM, RHS, AOS) – they signal verified quality.
- If measurements are present, compare them to published keys (e.g., spur length for A. aparoides vs. A. bancoense) [[4]].
- Inspect the physical label: pencil‑written, durable material, and securely attached.
- Record the label details in your grower journal; add bloom dates and any repotting notes.
Conclusion
Reading an Angraecum label is a step‑by‑step process: identify the genus and species, decode any hybrid or cultivar notation, recognize award and SITF codes, and verify diagnostic measurements when present. Coupled with a well‑made, durable label, this practice safeguards your collection against misidentification and helps you communicate accurately with societies, judges, and fellow growers.
FAQ
What does the AM abbreviation mean on an Angraecum label?
AM stands for Award of Merit, an AOS or RHS award given to orchids scoring 80‑89 points. The award is shown as AM or AM/RHS on the label [[1]].
How can I tell if a plant is a hybrid rather than a pure species?
Hybrid formulas always include a multiplication sign (×) between the parent genera or species. Cultivars, on the other hand, are written in single quotes after the species name. Example: Angraecum × Jumellea ‘Sunset’ (hybrid) vs. Angraecum sesquipedale ‘Grand Bleu’ (cultivar).
Why are ovary and spur lengths listed on some Angraecum labels?
These measurements are required for SITF submissions. They allow experts to differentiate species that are otherwise very similar, such as A. aparoides (spur ≈0.7 cm) versus A. bancoense (spur 0.25‑0.5 cm) [[4]].
What should I do if my label falls off or becomes illegible?
Use a durable, water‑resistant label material (e.g., premium white vinyl) and write with a pencil. Keep a spare label in your grower’s notebook so you can quickly replace a lost one [[9]].
Related terminology
- AM
- Award of Merit, an honor given by the AOS or RHS; appears on labels as AM or AM/RHS.
- SITF
- Society for the Identification of True Forms; provides species verification and often includes ovary and spur measurements on labels.
- Hybrid formula
- A notation showing parent species, using ‘×’ between genera and parentheses for species names.
- Cultivar
- A horticulturally selected variety, indicated by a single‑quoted name after the species.
FOLLOW THE EVIDENCE
Sources & references
- Orchidist's Glossary (2022). https://secure.aos.org/media/Judging-Education/The-Orchidist_s-Glossary-3-29-2022.pdf
- Oviatt, B. & Nerison, W. (2016). Angraecum infundibulare label guide. https://botanicaltd.com/wp-content/uploads/2022/12/aos-angraecum-infundibulare-dec2016-oviatt-nerison-1.pdf
- South Coast Orchid Society – Best Practices for Orchid Plant Labels. https://www.southcoastorchidsociety.com/OrchidLabels.html
- Gardzen (2023). How to Read Plant Labels. https://gardzenonline.com/blogs/gardzen/how-to-read-plant-labels
- SITF Findings – Angraecum aparoides (2025). https://www.aos.org/awards-judging/sitf-findings/Angraecum-aparoides-CarolAnn-CBR-2025-01-21