Jepson eFlora
Key to families | Table of families and genera

Key to Rubus

View taxon page for Rubus

Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.

1. Stipules triangular-lanceolate to ovate or elliptic, 1.5–4(10) mm wide

2. Prickles small, ± wide-based, curved ..... R. nivalis

2' Prickles 0

3. Stems prostrate; leaf blade < 4 cm; pistils < 15; styles long, slender ..... R. lasiococcus

3' Stems erect; leaf blade > 5 cm; pistils > 30; styles short, thick ..... R. parviflorus

1' Stipules thread-like to linear, <= 1 mm wide

4. Stems not angled; flowers generally <= 10; fruit raspberry-type (blackberry-type in Rubus ursinus)

5. Stems erect, not glaucous; petals magenta ..... R. spectabilis

5' Stems prostrate to decumbent or arched to mounded, glaucous; petals white or ± pink

6. Leaves gray-hairy abaxially; flowers generally unisexual; ovaries glabrous or hairy ..... R. ursinus

6' Leaves densely white-tomentose abaxially; flowers bisexual; ovaries densely hairy

7. Prickles weak, straight or ± curved; pistils < 10 ..... R. glaucifolius

7' Prickles stout, straight or generally curved; pistils generally > 30 ..... R. leucodermis

4' Stems 5-angled; flowers generally >= 10 (as few as 5 in Rubus pensilvanicus); fruit blackberry-type

8. Prickles 0 ..... R. ulmifolius var. anoplothyrsus

8' Prickles many, stout, wide-based

9. Leaves compound, leaflets deeply dissected ..... R. laciniatus

9' Leaves simple or compound, leaflets 0 or not dissected

10. Leaves gray-hairy abaxially; inflorescence a raceme-like cyme ..... R. pensilvanicus

10' Leaves densely white-tomentose abaxially; inflorescence a panicle-like cyme

11. Stems not glaucous; terminal leaflets of 1st-yr stems generally wide-elliptic to -obovate, unevenly coarse-toothed ..... R. armeniacus

11' Stems glaucous; terminal leaflets of 1st-yr stems oblong to narrow-obovate, evenly finely toothed ..... R. ulmifolius var. ulmifolius


Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from The Jepson Herbarium.