Duke, N.C. (14 July 1984), A mangrove hybrid, Sonneratia x gulngai (Sonneratiaceae) from north-eastern Australia. Austrobaileya 2(1): 103 [tax. nov.]

• Type: "COOK DISTRICT: McIvor River, (15°08′S, 145°14′E), 8 Dec 1978, N.C. Duke AIMS-547. (Type: BRI, holo; AIMS, CANB, JCT, K, L, iso)."

Duke, N.C. & Jackes, B.R. (1987), A systematic revision of the mangrove genus Sonneratia (Sonneratiaceae) in Australasia. Blumea 32(2): 292 [secondary reference]

Duke, N.C. (1988), Phenologies and litter fall of two mangrove trees, Sonneratia alba Sm. and S. caseolaris (L.) Engl., and their putative hybrid, S. gulngai N.C.Duke. Australian Journal of Botany 36(4): 473-482 [secondary reference]

Hewson, H.J. in George, A.S. (ed.) (1990), Sonneratiaceae. Flora of Australia 18: 89, 91, map 139 APC [secondary reference]

• APC Comment: A hybrid between Sonneratia alba Sm. and S. caseolaris (L.) Engl.
• APC Dist.: Qld

Cooper, W.E. & Cooper, W.T. (2004), Fruits of the Australian Tropical Rainforest: 524 [secondary reference]

Duke, N.C. (2006), Australia's mangroves: 180-181 [secondary reference]

common name: Gulngai-hybrid apple mangrove [n/a]

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