Plowman, ?Bot. Mus. Leafl. 23(6): 255. 1973?, 1973.

Plowman, ?Bot. Mus. Leafl. 23(6): 259. 1973?, 1973.

Plowman, ?Bot. Mus. Leafl. 23(6): 245. 1973.?, 1973.

Plowman, ?Bot. Mus. Leafl. 23(6): 251. 1973?, 1973.