Dear all, Reproducing the key from 'The Indian Verbenaceae' by A. Rajendran and P. Daniel (2002) published by BSMPS, Dehra Dun:
Corolla and calyx scarlet or orange-red.....................f. sanguinea Corolla and calyx lemon-yellow................................f. citrina Holmskioldia sanguinea Retz., Obs. Bot. 6: 31-32. 1791. f. citrina Moldenke in Phytologia 8: 58. 1961. Type: Hawaiian Islands, Dahu, Honolulu, Foster Bot. Gard. 20. 09. 1961, Colin Peter 1264 (NY). But 'The Plant List' treats it as a synonym. Best regards, Ritesh.
