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June 22, 2012
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Southeastern, New Hampshire
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I’ve seen a lot of Blackberry bushes lately, but they don’t always have
flowers or blackberries growing, so they have been difficult to identify. This one
has both blackberries (still green) and flower remnants. Some of the important things
to look for are straightish spines on the primocane, stipitate glands or gland-tipped
hairs on the peduncle, raceme inflorescence longer than 8 mm. Key:
- Principal leaves compound.
- Stems woody. Clearly differentiated into primocanes and floricanes.
- 5 palmately arranged leaflets.
- Inflorescence a raceme.
- Primocanes arching to erect.
- Primocanes armed with at least some stout, broad-based prickles.
- Inflorescence with stipitate glands.
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