S.Knapp, ?Brittonia 44: 64. 1992.?, 1992.

S.Knapp, ?Novon, 2: 348. 1992.?, 1992.

S.Knapp, ?Brittonia 44: 62. 1992.?, 1992.

S.Knapp, ?Novon 2: 346, fig. 6. 1992.?, 1992.

S.Knapp, ?Brittonia 44: 65. 1992.?, 1992.

S.Knapp, ?Brittonia 44: 61. 1992.?, 1992.

S.Knapp, ?Novon 2: 344. 1992.?, 1992.

S.Knapp, ?Novon 2: 343. 1992.?, 1992.

S.Knapp, ?Brittonia 44: 67. 1992.?, 1992.

S.Knapp and S.Knapp, ?Bull. Brit. Mus. (Nat. Hist.) , Bot. 22: 147. 1992.?, 1992.

S.Knapp, ?Novon 2: 341. 1992.?, 1992.