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Key to Annona

Annonaceae

Annona

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© Scott Ward; dry season, mixed with water ash
(c) Cressler, Alan M.
(c) Sorrie, Bruce A. - CC-BY
1 Fruit (a syncarp) smooth (nearly unlobed, the individual carples flat apically); tepals broadly ovate, the petals only slightly shorter than the sepals; [native, of ponded and tidal wetlands]
(c) Bradley, Keith
1 Fruit (a syncarp) muricate, bumpy or otherwise studded with soft prickles (each of the individual carples with a projecting lobe or bump); tepals oblong to linear-oblong or if broadly ovate (A. montana), then the tepals distinctly longer than the petals and the carpels pubescent [uncommon exotics usually of disturbed uplands].
  2 Inner petals present; bumps of the fruit pointed prickles
  2 Inner petals absent or reduced to small scales; bumps of the fruit smooth/minutely rounded