KEY TO THE SPECIES OF Hapaline

1. Spadix with sterile apex formed of fused synandrodes. . ... . . . . . . . . . . 2
1a Spadix with sterile apex formed of free synandrodes. . . . . . . . . . . . . . . 4

2. Spadix sterile apex greatly elongated, exceeding spathe limb . . . . . . . .. . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . 1. H. appendiculata
2a. Spadix sterile apex not greatly elongated, not exceeding spathe limb . . . . . 3

3. Whole plant never more than 5 cm high. Inflorescences borne on short peduncles beneath the foliage; spadix c. 1 cm long. . . . . . . . . .2. H. celatrix
3a. Whole plant generally more than 5 cm high. Inflorescences borne above the foliage; spadix 5 - 8 cm long. . . . . . 3. H. brownii

4. Leaf blade broadly elliptic-cordiform; ovary solitary . 4. H. kerrii
4a. Leaf blade sagittate, hastate or elliptic; ovaries 7 - 8 . . . . . . . 5

5. Leaf blade hastate, strongly constricted above the posterior lobes . . . 7. H. colaniae
5a. Leaf blade variably sagittate or elliptic, not or barely constricted above the posterior lobes . . 6

6. Leaf blade variably sagittate, occasionally constricted at the junction of the anterior and posterior lobes, posterior lobes divergent; ovary ovoid. . . 5. H. benthamiana
6a. Leaf blade elliptic, never constricted at the junction of the anterior and posterior lobes, posterior leaf lobes not divergent; ovary bottle-shaped. .. . . . . 6. H. ellipticifolia