Homalomena, Schott, 1832

Key to the small rheophytic Homalomena View in CoL in New Guinea [modified from Hay (1999)]

1. Leaf blade with seven pairs of sub-opposite primary veins ............................................................................................... H. adiensis View in CoL

- Leaf with two or three pairs of sub-opposite primary veins...............................................................................................................2

2. Apex of spathe not reflexed, spadix not exceeding the spathe, infrapistillar staminodes absent (very rarely present) ........ H. stollei View in CoL

- Apex of spathe reflexed at anthesis, spadix protruding from the spathe at anthesis, infrapistillar staminodes present.....................3

3. Petiole shorter than blade, sheath ⅓ to ⅗ the length of the petiole, leaf apex apiculate, spathe ribbed outside, pistillate flowers zone shorter than the staminate flowers zone, staminode less than ½ the height of the ovary, staminate flowers zone with acute tip ....... .................................................................................................................................................................................................. H. adei

- Petiole longer than blade, sheath ¼ the length of the petiole, leaf apex attenuate, spathe smooth outside, pistillate flowers zone equal to the staminate flowers zone, staminode ⅔ the height of the ovary, staminate flowers zone with blunt tip...... H. steenisiana View in CoL