Series Echinatae J.C.Manning & Klak, ser. nov.

Type: T. echinata Aiton.

Prostrate ± annual herbs. Flowers sessile or subsessile, solitary or in small groups. Stamens as many as and alternating with perianth segments, sometimes in pairs, or sometimes fewer. Ovary half­inferior. Fruit not winged, often with ridges or projections at top or sides.

Species: T. acanthocarpa Adamson, T. caesia Adamson, T. echinata Aiton, T. microptera Fenzl

Note: The accession identified as ‘ T. microptera (voucher Klak 2430, BOL)’ in Klak et al. (2017)