Broussaisia arguta Gaudich. , Voy. Uranie, Part 12: 479. 1830.
Broussaisia arguta Gaudich. f. glabra Fosberg, Occas. Pap. Bernice P. Bishop Mus. 15(4): 58. 1939.
Type information:
Holotype
[BISH]. Catto 72. Kaua`i: Lihu`e-Koloa Forest Reserve, mountains, N. Fork Waialua River.1250?.
=Hydrangea arguta
Broussaisia arguta Gaudich. f. oppositifolia Fosberg, Occas. Pap. Bernice P. Bishop Mus. 15(4): 60. 1939.
Type information:
Holotype
[BISH]. F.R. Fosberg 12376. 28 November 1935. Lana`i: Pu`u A`alii, moist forest.900m.
=Hydrangea arguta
Broussaisia arguta Gaudich. f. pellucida (Gaudich.) Fosberg, Occas. Pap. Bernice P. Bishop Mus. 15(4): 59. 1939.
Broussaisia arguta Gaudich. f. ternata C. N. Forbes ex Skottsb., Acta Horti Gothob. 2: 235. 1926.
Type information:
Lectotype
[BISH]. C.N. Forbes 940.M. July 1919. Maui: Ukulele.
Lectotypified in H. St. John. Phytologia 34: 148. 1976.
Broussaisia arguta Gaudich. f. ternatea H. St. John, Pacific Trop. Bot. Gard. Mem. 1: 169. 1973.
Type information:
Holotype
[BISH]. O. Degener and H. Wiebke 2308. 27 August 1927. Maui: on the way to Mt. `Eke from last ditchman's house at stream.
=Hydrangea arguta
Broussaisia arguta Gaudich. var. pellucida (Gaudich.) Fosberg, Occas. Pap. Bernice P. Bishop Mus. 15(4): 59. 1939.