Thee was a lot of discussion among the members:

There is a good key with descriptions and line drawings in the new A Tropical Garden Flora by Staples et al. See also images at links:

http://www.hear.org/starr/hiplants/images/thumbnails/html/polyscias_scutellaria.htm
http://www.hear.org/starr/hiplants/images/thumbnails/html/polyscias_guilfoylei.htm

A suggestion based on Art Whistler was:

• Photo (left) P. scutellaria ‘Tricochleata’. This variety has yellowish-green leaflets that are roughly divided into three, toothed lobes. This variety. is common (American Samoa), as are the Pseudocercospora leaf spots. The leaves of P. scutellaria are noticeably larger, entire,and lightly scalloped, but not toothed.

• Photo (right) This is closest to P. guilfoylei, it has, “. . . toothed and typically white leaf margins”. Maybe the key word is “typically”. The leaf description is: odd-pinnately compound or the leaflets further irregularly divided, alternate, leaflets 5 to 9, blades elliptic to oblong, 4-18 cm long, margins often white and toothed to deeply lobed. The leaves in his photo are a darker green than in your photo, but this could be a difference in light exposure.

Cook Islands stated Polyscias scutellaria and P. guilfoylei are confusing and confused. In addition to AC Smith’s Flora Vitiensis Nova, a good place to start is: Lowry PP (1989) A revision of Araliaceae from Vanuata. Bull. Mus. natn. Hist. nat. Paris, 4th series 11 (section B, No.2): 117-155. The interpreation was:

Polyscias guilfoylei (left) is Polyscias scutellaria cv. Tricochleata or ‘Tricochleata’. ‘Tricochleata’ is the left one in the image at: http://cookislands.bishopmuseum.org/species.asp?id=6565

Polyscias guilfoylei (right) is the regular Polyscias guilfoylei. The latter species with form ‘Laciniata’ and ‘Crispa’ are shown at: http://cookislands.bishopmuseum.org/species.asp?id=6564