Synonyms
Panicum rigidulum var. combsii (Scribn. & C.R.Ball) Lelong
Panicum longifolium var. combsii (Scribn. & C.R.Ball) Fernald
Panicum rigidulum subsp. combsii (Scribn. & C.R.Ball) Freckmann & Lelong
Sorengia longifolia subsp. combsii (Scribn. & C.R.Ball) Zuloaga & Morrone
Panicum combsii Scribn. & C.R.Ball