Jepson eFlora
Key to families | Table of families and genera

Key to Rubus

View taxon page for Rubus

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.