Citation: Schott, Rutaceae 7:t. 4 (1834).

Derivation: After J. D. Geijer, a Swedish botanist, author of 'Diktamnographia', 1686, and other works.

Synonymy: Not Applicable

Common name: None

Description:
Shrubs or trees; branchlets glabrous to sparsely pubescent with simple hairs; leaves alternate, lacking stipules, petiolate, simple, glabrescent.

Inflorescence a many-branched dichasial cyme, terminal or in upper axils; bracts small; flowers bisexual; calyx lobes 5, minute; petals 5, free, spreading, white; disk shallowly 5- rarely 4-lobed; stamens 5 (rarely 4); filaments inserted below the disk, short, glabrous; anthers versatile, introrsely and longitudinally dehiscent; gynoecium 5- rarely 4-carpellate; carpels more or less united, partly immersed in a disk; ovules 2 per carpel; style short, inserted at the apex of the carpels; stigma capitate, 5- rarely 4-lobed.

Fruit of 1-4 ovoid cocci, dehiscing apically; exocarp cartilaginous; endocarp more or less attached to the coccus after dehiscence; seed 1 per coccus, retained in the coccus after dehiscence; testa consisting of a shiny pellicle overlaying a thick spongy layer and an inner bony layer.

Distribution:  A genus of 5 species (Australia, New Guinea, New Caledonia and Loyalty Island); all species occur in Australia, 4 endemic; 2 species in S.Aust.

Biology: No text

Key to Species:

1. Leaves 2-5 cm long, obtuse	G. linearifolia 1.
1. Leaves 6-18 cm long, mostly acute	G. parviflora 2.

Author: Not yet available