Zygogynum Explained

Zygogynum is a genus of plant in the winter's bark family Winteraceae. 19 species are native to New Caledonia, and are pollinated primarily by beetles and moths.^[1] Other species are native to New Guinea (21 species), the Bismarck Archipelago (1 species), the Solomon Islands (2 species), Lord Howe Island (1 species), and Queensland (2 species).^[2]

This genus is interesting for having the greatest range in the number of stamens in any genus: as few as three or as many as 370; a 123 fold difference in the number of stamens. The number of carpels can range from one to as many as fifty.^[3]

Species

The genus includes 45 accepted species:^[2]

• Zygogynum acsmithii Vink – southeastern New Caledonia
• Zygogynum amplexicaule (Vieill. ex P.Parm.) Vink – northern and western New Caledonia
• Zygogynum archboldianum (A.C.Sm.) Vink – western New Guinea
• Zygogynum argenteum (A.C.Sm.) Vink – New Guinea
• Zygogynum baillonii Tiegh. – southeastern New Caledonia
• Zygogynum bicolor Tiegh. – central New Caledonia
• Zygogynum bosavicum Vink – New Guinea
• Zygogynum bullatum (Diels) Vink – Mt. Stolle, New Guinea
• Zygogynum calophyllum (A.C.Sm.) Vink – New Guinea
• Zygogynum calothyrsum (Diels) Vink – New Guinea
• Zygogynum clemensiae (A.C.Sm.) Vink – New Guinea
• Zygogynum comptonii (Baker f.) Vink - northern New Caledonia
• Zygogynum crassifolium (Baill.) Vink – New Caledonia
• Zygogynum cristatum Vink – central New Caledonia
• Zygogynum cruminatum Vink – New Guinea
• Zygogynum cyclopensis Vink – New Guinea
• Zygogynum fraterculus Vink – New Caledonia
• Zygogynum haplopus (B.L.Burtt) Vink – Solomon Islands
• Zygogynum howeanum (F.Muell.) Vink – Lord Howe Island
• Zygogynum ledermannii (Diels) Vink – New Guinea
• Zygogynum longifolium (A.C.Sm.) Vink – New Guinea and Bismarck Archipelago
• Zygogynum mackeei Vink – northern New Caledonia
• Zygogynum megacarpum (A.C.Sm.) Vink – western New Guinea
• Zygogynum montanum (Lauterb.) Vink – Papua New Guinea
• Zygogynum oligocarpum (Schltr.) Vink – Papua New Guinea
• Zygogynum oligostigma Vink – central New Caledonia
• Zygogynum pachyanthum (A.C.Sm.) Vink – New Guinea
• Zygogynum pancheri (Baill.) Vink – east-central and southeastern New Caledonia
• Zygogynum pauciflorum (Baker f.) Vink – Mont Panié, northern New Caledonia
• Zygogynum polyneurum (Diels) Vink – western New Guinea
• Zygogynum pomiferum Baill. – northern and central New Caledonia
• Zygogynum queenslandianum (Vink) Vink – northeastern Queensland
• Zygogynum schlechteri (Guillaumin) Vink – southeastern New Caledonia
• Zygogynum schramii Vink – western New Guinea
• Zygogynum semecarpoides (F.Muell.) Vink – northeastern Queensland
• Zygogynum sororium (Diels) Vink – Schrader Range, Papua New Guinea
• Zygogynum staufferianum Vink – Papua New Guinea
• Zygogynum stipitatum Baill. – northern and central New Caledonia
• Zygogynum sylvestre (A.C.Sm.) Vink – New Guinea
• Zygogynum tanyostigma Vink – Mont Panié, northern New Caledonia
• Zygogynum tieghemii Vink – central and southeastern New Caledonia
• Zygogynum umbellatum (Ridl.) Vink – New Guinea
• Zygogynum vieillardii Baill. – central and southeastern New Caledonia
• Zygogynum vinkii F.B.Sampson – central New Caledonia
• Zygogynum whitmoreanum Vink – Solomon Islands

Notes and References

1. Pellmyr . O. . Thien . L. B. . Bergström . G. . Groth . I. . Pollination of New Caledonian Winteraceae: Opportunistic shifts or parallel radiation with their pollinators? . 10.1007/BF00940859 . Plant Systematics and Evolution . 173 . 3–4 . 143 . 1990 . 1990PSyEv.173..143P . 7894633 .
2. "Zygogynum Baill." Plants of the World Online, Kew Science. Accessed 24 April 2022.
3. Book: Kubitzki, Klaus . 1993 . Families and Genera of Vascular Plants . Berlin . Springer Verlag . 2 . 637.