Flora of the Southeastern United States
2022 Edition

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Key to Rosaceae, Key C: Shrubs and trees with simple leaves

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1 Ovary inferior; fruit indehiscent (pome); [tribe Pyreae].
..2 Upper surface of leaves bearing dark glandular trichomes along the midrib (most easily seen with a 10× hand lens); shrubs
..2 Upper surface of leaves lacking dark glandular trichomes along the midrib; shrubs and trees.
....3 Ovary and fruit 10-locular; inflorescence a raceme (rarely a fascicle); pome < 1 cm in diameter
....3 Ovary and fruit 5-locular; inflorescence a cyme, umbel, or fascicle (lacking an elongated central axis); pome 0.7-10 cm in diameter.
......4 Styles distinct; exocarps (carpels within pericarp) bony and seedlike; trees and shrubs, with thorns
......4 Styles usually connate at base; exocarps leather or papery and easily opened to expose seeds; small trees, unarmed, or armed with sharp spur branches.
........5 Pome globose to ovoid, lacking stone cells; anthers yellow to white; styles connate at the base; leaves blunt to acuminate; [apples and crabapples]
........5 Pome globose or pyriform, with stone cells; anthers reddish; styles distinct; leaves acute to acuminate; [pears]
1 Ovary superior; fruit dehiscent (aggregate of follicles, or capsule) or indehiscent (drupe, aggregate of drupelets, aggregate of achenes).
..........6 Leaves opposite; fruit a drupe; [tribe Kerrieae]
..........6 Leaves alternate; fruit various (see below).
............7 Leaves large, > 10 cm wide, palmately veined, palmately lobed; fruit an aggregate of drupelets; [tribe Rubeae]
............7 Leaves smaller, < 8 cm wide, pinnately veined, either not lobed or basally pinnately lobed; fruit a drupe, a capsule, an aggregate of follicles, or an aggregate of achenes.
..............8 Leaves singly serrate or entire, not lobed basally.
................9 Gynoecium of separate carpels; fruit an aggregate of follicles; [tribe Spiraeeae]
................9 Gynoecium of fused carpels; fruit either a fleshy drupe or a capsule.
..................10 Ovary 5-angled in ×-section; fruit a 5-angled capsule; leaves obovate, obviously broadest towards the tip; [tribe Osmaronieae]
..................10 Ovary circular in ×-section; fruit a fleshy spherical drupe; leaves generally broadest near or below the middle; [tribe Amygdaleae]
..............8 Leaves doubly serrate, also often lobed towards the base.
....................11 Corolla yellow; stems arching, green; fruit an aggregate of drupe-like achenes (dry and indehiscent); [tribe Kerrieae]
....................11 Corolla white to pink or rose; stems not both arching and green; fruit various (see below).
......................12 Inflorescence a dense, umbel-like corymb; leaf apices rounded to acute; fruit an aggregate of 5 follicles; [tribe Neillieae]
......................12 Inflorescence a raceme or a leafy panicle; leaf apices acuminate.
........................13 Fruit a single follicle; [alien, planted, and rarely naturalized, as in e. VA]; [tribe Neillieae]
........................13 Fruit an aggregate of 2-4 drupe-like achenes; [rare native of calcareous habitats in sc. TN, nw. GA, n. AL, and disjunct westward in AR and MO]; [tribe Kerrieae]