Haplanthodes, Kuntze, 1903

Deshmukh, Pradip Vikram, Surveswaran, Siddharthan, Gore, Ramchandra Dnyanoba & Lekhak, Manoj Madhwanand, 2021, Taxonomic studies in the genus Haplanthodes (Acanthaceae), Phytotaxa 516 (3), pp. 201-222 : 203

Key to species of Haplanthodes

1. Cladodes stout, spiny..................................................................................................................................................... H. verticillata

- Cladodes slender, not spiny ................................................................................................................................................................2

2. Feathery hairs present only on the lower half of the cladode; calyx 1/2 the length of corolla; cladodes up to 1.8 cm long ............... ........................................................................................................................................................................................... H. plumosa

- Feathery hairs absent on the cladode; calyx 1/4 the length of corolla; cladodes up to 3 cm long .....................................................3

3. Ovary glabrous; bracts equal to length of calyx; cladodes 2–4 times longer than the length of corolla; seeds with micro-papillae .. ....................................................................................................................................................................................... H. tentaculata

- Ovary hairy; bracts shorter than the length of calyx; cladodes equal or shorter than the length of corolla; seeds without micropapillae .................................................................................................................................................................. H. neilgherryensis