Psychotria homoplastica Moore, Trans. Linn. Soc. II. 4: 378. pl. 26, fig 1-5. 1896.
Cephaelis stipulosa (M.-Arg.) Standl., Field Mus. Publ. Bot. 7: 430. 1931.
In its slightly bifid stipules with oblong-lanceolate subacute lobes this species approaches P. capitata subsp amplifolia. There is also an affinity shown with P. franquevilleana M.-Arg. and its allies.
The original description was drawn by Müller-Argoviensis from a young head with the flowers just beginning to open and with poorly developed bracts. As shown by recently collected specimens, cited above, the corolla attains 14.5-15 mm at anthesis and the outer bracts which subtend the clusters of flowers are 9-13.5 × 3-7 mm. The inflorescence has 8-10 main axes. There are usually eight flowers in an ultimate unit with usually three of them on one side, four on the other, and one in the center, the latter central flower solitary at the fork and without any bract. These eight flowers are subtended by six or seven bracts. From P. capitata subsp amplifolia the present taxon is distinguished by the much larger bracts of the inflorescence, the much broader stipules with comparatively shorter and subtruncate tips of the stipules, and the lateral nerves of the leaf blades ending near the margin rather than anastomosing.