Dichanthelium portoricense (Desv. ex Ham.) B.F. Hansen & Wunderlin in Ann. Missouri Bot. Gard. 75: 1649. 1989 ["1988"] sec. Dávila & al. 2018
- ≡Panicum portoricense Desv. ex Ham., Prodr. Pl. Ind. Occid.: 11. 1825 syn. sec. Dávila & al. 2006
- =Panicum portoricense Desv. ex Ham. var. portoricense, Prodr. Pl. Ind. Occid.: 11. 1825 syn. sec. Soreng, R. J., Davidse, G., Peterson, P. M., Zuloaga, F. O., Judziewicz, E. J., Filgueiras, T. S. & Morrone, O.: Catalogue of New World Grasses
- =Panicum lancearium Trin., Gram. Panic.: 223. 1826 syn. sec. Dávila & al. 2006
- =Panicum lancearium Trin. var. lancearium, Gram. Panic.: 223. 1826 syn. sec. Dávila & al. 2006
- =Panicum webberianum Nash in Bull. Torrey Bot. Club 23: 149. 1896 syn. sec. Dávila & al. 2006
- =Panicum columbianum Scribn. in Bull. Div. Agrostol., U.S.D.A. 7: 78, f. 60. 1897 syn. sec. Dávila & al. 2006
- =Panicum nashianum Scribn. in Bull. Div. Agrostol., U.S.D.A. 7: 79, f. 61. 1897 syn. sec. Dávila & al. 2006
- =Panicum nashianum Scribn. var. nashianum in Bull. Div. Agrostol., U.S.D.A. 7: 79, f. 61. 1897 syn. sec. Dávila & al. 2006
- =Panicum tsugetorum Nash in Bull. Torrey Bot. Club 25(2): 86. 1898 syn. sec. Dávila & al. 2006
- =Panicum patentifolium Nash in Bull. Torrey Bot. Club 26(11): 574. 1899 syn. sec. Dávila & al. 2006
- =Panicum pauciciliatum Ashe in J. Elisha Mitchell Sci. Soc. 16: 87. 1899 syn. sec. Dávila & al. 2006
- =Panicum psammophilum Nash in Bull. Torrey Bot. Club 26(11): 576. 1899 syn. sec. Dávila & al. 2006
- =Panicum nashianum var. patulum Scribn. & Merr. in Circ. Div. Agrostol. U.S.D.A. 27: 9. 1900 syn. sec. Dávila & al. 2006
- =Panicum onslowense Ashe in J. Elisha Mitchell Sci. Soc. 16: 88. 1900 syn. sec. Dávila & al. 2006
- =Panicum wilmingtonense Ashe in J. Elisha Mitchell Sci. Soc. 16: 86. 1900 syn. sec. Dávila & al. 2006
- =Panicum patulum (Scribn. & Merr.) Hitchc. in Rhodora 8(95): 209. 1906 syn. sec. Dávila & al. 2006
- =Panicum lancearium var. patulum (Scribn. & Merr.) Fernald in Rhodora 36(423): 80. 1934 syn. sec. Dávila & al. 2006
- =Dichanthelium columbianum (Scribn.) Freckmann in Phytologia 39(4): 270. 1978 syn. sec. Dávila & al. 2006
- =Dichanthelium sabulorum var. patulum (Scribn. & Merr.) Gould & C.A. Clark in Ann. Missouri Bot. Gard. 65(4): 1113. 1979 ["1978"] syn. sec. Dávila & al. 2006
- =Panicum acuminatum var. columbianum (Scribn.) Lelong in Brittonia 36(3): 270. 1984 syn. sec. Dávila & al. 2006
- =Panicum portoricense var. nashianum (Scribn.) Lelong in Brittonia 36(3): 267. 1984 syn. sec. Dávila & al. 2006
- =Dichanthelium portoricense (Desv. ex Ham.) B.F. Hansen & Wunderlin subsp. portoricense in Ann. Missouri Bot. Gard. 75: 1649. 1989 ["1988"] syn. sec. Dávila & al. 2006
- =Panicum sabulorum var. patulum (Scribn. & Merr.) C.F. Reed in Phytologia 67(6): 452. 1989 syn. sec. Dávila & al. 2006
- =Dichanthelium acuminatum subsp. columbianum (Scribn.) Freckmann & Lelong in Sida 20(1): 167. 2002 syn. sec. Dávila & al. 2006
- =Dichanthelium portoricense subsp. patulum (Scribn. & Merr.) Freckmann & Lelong in Sida 20(1): 170-171. 2002 syn. sec. Dávila & al. 2006