Stenandrium subg. Coriifolium

Franck, Alan R. & Daniel, Thomas F., 2015, Taxonomic and Nomenclatural Notes on Six Genera of Acanthaceae in the West Indies, Proceedings of the California Academy of Sciences 62 (10), pp. 309-329 : 323-324

Key to species of Stenandrium subg. Coriifolium in the West Indies

1b. Plants rosulate, internodes inconspicuous......................................... 2

1a. Plants caulescent, internodes conspicuous........................................ 3

2a. Leaves> 9 cm long, blades abaxially punctate-pitted but lacking protuberances or trichomes; inflorescences> 30 cm long......................................... 1. S. ekmanii

2b. Leaves up to 9 cm long, blades abaxially scabrous with subconic protuberances usually terminated by eglandular trichomes and pubescent along midvein; inflorescences up to 26 cm long.............................................................. 2. S. scabrosum

༶. Leaf blades crenate,> 2 cm long; stem internodes> 8 mm long; inflorescences> 8 cm long............................................................... 3. S. undulatum

༷. Leaf blades entire, <2 cm long; stem internodes <6 mm long; inflorescences up to 8 cm long................................................................ 4. S. wrightii