Fig 43 A-D.
This species was originally described from fruiting material. Flowering specimens have now been collected. A. exalatum belongs in the series Nobiles in Woodson's revision (1951). It has no very close relative, although its cymose inflorescence suggests A. album (Vahl) R. Ben. ex M. Pichon. Inflorescence cymose, ample, the flowers crowded; calyx closely sordid-ashy to brownish-tomentellous without, the sepals ovate, unequal in size, obtusish, 1.8-2.2 mm long; corolla carnose, completely glabrous outside, the tube cylindric, angulate, 5 mm long, papillate within, the lobes spiral-contorted to the right in aestivation, dolabriform, 4.5 mm long, 1.5 mm wide, acutish at the apex; stamens inserted near the middle of the corolla tube, the anthers about 1 m m long; ovary glabrous, narrowed to the style at the apex.