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Trees or shrubs, rarely climbers. Stipules band-shaped and mucronate or triangular. Inflorescence pseudo-axillary, appearing leaf-opposed or from a leafless node. Flowers (4-) 5-(-7) merous. Calyx cupulate. Corolla tube usually hairy at the throat, lobes usually reflexed. Anthers usually reflexed, ridged (or locellate). Ovary 2-locular, ovules numerous, stigmas clavate. Fruits globose. Seeds covered with pulpy matrix.

Key to the species

Serial Key Reference
1a. Inflorescence with one normal leaf at the node opposed by a filiform deciduous scale. Few to many flowers on short peduncle with dense short deltoid bracteoles A. micrantha
1b. Inflorescence from leafless nodes 2
2a. Inflorescence cincinnoid A. pseudospicata
2b. Inflorescence not cincinnoid 3
3a. Inflorescence dichasial cymes 4
3b. Inflorescence corymbose cymes A. oppositifolia var. floribunda
4a. Corolla tube 3-4 mm long; lobes narrowly spatulate-oblong A. cochinchinensis
4b. Corolla tube 5-8 mm long; lobes lanceolate A. densiflora