Flora of the Southeastern United States
2022 Edition

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Key to Rubus, Key C: Dewberries

Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

1 Stems strongly white-glaucous; fruits with 1-5 (-20) drupelets, glaucous
1 Stems not glaucous (or with a slight 'bloom' when young); fruits with (5-) 10-50 drupelets, not glaucous.
..2 Stems primarily armed with narrow-based prickles or even narrower bristles, with or without stout-based prickles as well.
....3 Inflorescence racemiform; bristles of the stem nonglandular (very small glandular hairs may be present)
....3 Inflorescence reduced, normally to a single flower per branch of the floricane
..2 Stems armed with stout-based, usually recurved prickles (bristles lacking, though weak, stalked glands may be present); leaf undersurfaces nearly glabrous or softly pubescent; leaves deciduous.
......4 Leaf undersurface thinly hairy, not soft to the touch (when fully developed).
........5 Primocane leaves with 3 leaflets; inflorescences with 1 (-3) flowers, 5-8 cm long
........5 Primocane leaves with 3-5 leaflets; inflorescences with 1-12 flowers, 5-20 cm long.
..........6 Canes 2-3 mm in diameter; prickles 1-2 mm long; primocane leaves mostly with 3 leaflets; inflorescences with 1-6 flowers
..........6 Canes 3-5+ mm in diameter; prickles 2-4 mm long; primocane leaves mostly with 5 leaflets; inflorescences with 4-12 flowers.
............7 Primocanes with 1-3 prickles per cm of length; tips of central primocane leaflets gradually or relatively long-tapered to the tip
............7 Primocanes with 3-5 prickles per cm of length; tips of central primocane leaflets abruptly tapered to the tip
......4 Leaf undersurface densely hairy, soft to the touch.
..............8 Inflorescence axes with stalked glands (use 10× magnification).
................9 Primocane terminal leaflets ovate to elliptic, the base subcordate; inflorescences (at least some) with 3-6 flowers
................9 Primocane terminal leaflets elliptic, the base cuneate to rounded; inflorescences with 1-2 flowers
..............8 Inflorescence axes lacking stalked glands.
..................10 Canes 4-7 mm in diameter, 4-12 dm in height; inflorescences mostly racemose, with 4-8 flowers
..................10 Canes mostly 2.5-5 mm in diameter, 2-6 dm in height; inflorescences not racemose, with flowers clustered near the tip, with 1-7 (-8) flowers.
....................11 Flowers on pedicels < 3.5 cm long, the inflorescence compact
....................11 Flowers on pedicels (at least some of them) > 3.5 cm long, some of the pedicels conspicuously ascending.
......................12 Primocane terminal leaflets with coarsely incised margins; inflorescences usually with just 1 flower; sepals often with an obviously spatulate tip 1-3 mm long
......................12 Primocane terminal leaflets regularly toothed; inflorescences usually with 2-8 flowers; sepals tapered to a sharply pointed tip.
........................13 Primocane terminal leaflets elliptic, rounded at the base
........................13 Primocane terminal leaflets ovate, cordate at the base