Rosaceae subfam. Amygdaloideae
Shrubs or trees, sometimes subshrubs or herbs. Leaves alternate, sometimes opposite, simple, sometimes pinnately compound; stipules present or absent. Flowers: torus absent or minute; carpels 1–5(–8), distinct or +/- connate (Maleae), free or +/- adnate to hypanthium (many Maleae), styles distinct or +/- connate (some Maleae); ovules (1 or)2(–5+), collateral, clustered, or biseriate. Fruits follicles aggregated or not, capsules, drupes aggregated or not, aggregated drupelets, pomes, or aggregated nutlets, rarely achenes or aggregated achenes; styles persistent or deciduous, not elongate (elongate in Gillenieae). x = 8, 9, 15, 17.
North America, Mexico, Central America, South America, Europe, Asia, Africa, Atlantic Islands (Madeira), Pacific Islands (Hawaii), Australia.
Cyanogenic glycosides are usually present in Amygdaloideae; sorbitol is present.
The name Amygdaloideae Arnott (1832) has priority over Spiraeoideae Arnott (1832), used by D. Potter et al. (2007), because Amygdalaceae (1820) is an earlier conserved name.
Tribes 9, genera 55, species ca. 1300 (9 tribes, 38 genera, 361 species, including 20 hybrids, in the flora)
Campbell, C. S. et al. 1995. Phylogenetic relationships in Maloideae (Rosaceae): Evidence from sequences of the internal transcribed spacers of nuclear ribosomal DNA and its congruence with morphology. Amer. J. Bot. 82: 903–918.