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Trees, shrubs or scandent shrubs. Leaves distichous, 3-5 nerved from the base, serrate, serrulate, double serrulate or dentate. Inflorescence of axillary cymes.Flowers 5-merous, hermaphrodite and unisexual. Sepals free, hairy outside, glabrous or hairy inside. Petals free, glabrous at the base. Stamens numerous, free, anthers dorsifixed, curved, opening lengthwise, staminodes none in male flowers, many in female flowers. Ovary 2-4 locular, eachlocule 2-ovuled, styles subulate, stigmas peltate or lobed. Fruit a capsule, wingless, 2-4 lobed, indehiscent.

Key to the species

Serial Key Reference
1a. Inflorescence paniculate, terminal and/or axillary. Leaves subentire or serrulate; petals white or yellow, drupe globose G. nervosa
1b. Inflorescence cymose, terminal or leaf-opposed 2
2a. Peduncles much shorter than or as long as petioles 3
2b. Peduncles much longer than the petioles 7
3a. Flower buds more than 1 cm long. Leaves round-ovate, obovate or obcordate, petals white G. sclerophylla
3b. Flower buds lessthan 0.8 cm long 4
4a. Stipules auriculate 5
4b. Stipules not auriculate 6
5a. Leaves ovate-oblong or lanceolate, base rounded, petiole 5-7 mm; sepals linear G. arborea
5b. Leaves elliptic, elliptic-ovate, or ovate-rotund; petiole up to 4 cm; sepals elliptic or lanceolate G. tiliifolia
6a. Leaves rounded to abruptly acuminate at apex, villous beneath; flower buds ellipsoid G. villosa
6b. Leaves acute to acuminate at apex, scabrous above; flower buds ovoid or oblong G. abutilifolia
7a. Leaves 5-7 nerved 8
7b. Leaves 3(-4) nerved 10
8a. Stipules auriculate 9
8b. Stipiles linear or lanceolate. Leaves ovate, ovate-oblong, elliptic, elliptic-oblong or lanceolate, crenate-serrate, 5-6 nerved G. eriocarpa
9a. Leaves regularly crenate; petioles more than 6 mm long G. asiatica
9b. Leaves coarsely double-serrate; petioles up to 6 mm long G. sapida
10a. Leaves glaucous beneath. Peduncles slender, drupe not lobed G. rothii
10b. Leaves not glaucous beneath 11
11a. Plants with bisexual and unisexual flowers. Leaves oblique, stamens more than 40, drupes densely hirsute or hispid G. hirsuta
11b. Plants with bisexual flowers only. Leaves sharply serrate, drues 2-lobed G. serrulata