Singapore plant identification: two similar Alocasias, one missing view

The problem

You are visiting a Singapore garden and comparing Alocasia macrorrhizos with Alocasia odora. Both appear to have large arrow-like leaves, but your photograph does not clearly show where the leaf stalk meets the blade, so a confident name would exceed what you observed.

Begin with the missing view, not the most familiar name

Large leaves and an arrow-like outline do not settle this two-plant comparison. Keep the whole plant, leaf shape and location as context, then check whether your photograph shows the base of the blade around the leaf stalk. If that area is hidden, write “leaf base not visible” instead of choosing the closest-looking name. The task is to find an observation that separates the candidates. A garden label or a guide’s suggestion can give you a name to investigate, but ask which visible feature links it to this particular plant.

Use the official comparison with its juvenile qualification

NParks’ June 2025 comparison describes an open indentation between the leaf’s side lobes in adult Alocasia macrorrhizos, versus connected blade tissue closing that area in Alocasia odora. The indentation is called the sinus. The same document notes that juvenile A. macrorrhizos may be weakly peltate, while A. odora has a closed sinus at adult and juvenile stages. That age qualification matters: ask the guide to show the part being compared and whether leaf maturity complicates your observation. This is a limited comparison between two named candidates, not a complete identification key for every large-leaved plant.

• NParks: Alocasia macrorrhizos and Alocasia odora comparison (June 2025) ↗ · Source checked 21 October 2026

Build a four-field comparison note

Copy these fields: feature to inspect; what candidate A is described as having; what candidate B is described as having; what you can actually see. Start with the leaf-base indentation, then leave the last field blank if the view is blocked. Add a separate line for maturity: explained by the guide, uncertain, or not assessed. Keep missing flowers or another unseen structure separate from features you inspected. This note helps you ask, "What further view would distinguish these candidates, and is that feature reliable at this stage?" It is a question worksheet, not a scoring system in which the most matches proves a species.

Practise recording an unresolved comparison

In an invented example, a visitor’s photo shows one large leaf from the front while a second leaf obscures its base. Their note reads: candidates, the two Alocasias; visible, broad leaf outline; missing, a clear leaf-base view; maturity, unknown; next question, can the guide point out an unobstructed mature leaf from the permitted path? The answer remains unresolved until the relevant feature can be checked. If the plant cannot be seen more clearly without entering a restricted area or moving its leaves, keep the gap in the record. A useful session can teach why an identification remains uncertain.

Take the comparison question to the right session

Look for a plant-focused session that explains distinguishing features and allows observation questions. Before booking, ask whether a photograph of the whole plant and leaf base can be discussed, and whether the guide expects botanical vocabulary. Use the official comparison as background without assuming these species occur on the advertised route or that the guide will identify a personal image. Search current plant-related candidates after you have written the missing-view question. Leave with the explanation, its limits and one feature to check later; do not collect material, enter restricted beds or treat the result as permission to consume a plant.