| | 1. Plant body 6–10 mm, on a tapered stalk, often connected in branched chains of 10–30 |
| L. trisulca |
| | 1' Plant body 1–5 mm, appearing sessile, single or in clusters of 2–8 |
| |
| | 2. Vein 1 per plant body (sometimes obscure) |
| |
| | 3. Plant body 1–2.5 mm, widely elliptic, generally thicker in middle, generally in pairs; vein < 2/3 distance from root node to tip of plant body |
| L. minuta |
| | 3' Plant body 2–4 mm, ± oblong, very thin, transparent green, generally 4–8 attached; vein up to 3/4 distance from root node to tip of plant body |
| L. valdiviana |
| | 2' Veins 3–5 per plant body |
| |
| | 4. Root sheath with 2 obvious, wing-like appendages at base |
| L. aequinoctialis |
| | 4' Root sheath not winged |
| |
| | 5. Plant body widely elliptic to round, tip asymmetric, lower surface generally much swollen or rounded |
| L. gibba |
| | 5' Plant body widely elliptic, tip symmetric, lower surface flat |
| |
| | 6. Upper surface generally smooth; lower surface green; winter buds 0 |
| L. minor |
| | 6' Upper surface generally with midline row of minute bumps; lower surface becoming ± red; winter buds dark green or brown in autumn |
| L. turionifera
|