IWoodward's picture

Juncus articulatus?

Observed: 18th September 2012 By: IWoodwardIWoodward’s reputation in PlantsIWoodward’s reputation in PlantsIWoodward’s reputation in PlantsIWoodward’s reputation in Plants
Epping Forest Warren Pond area Juncus 2012-09-18 6
Epping Forest Warren Pond area Juncus 2012-09-18 4
Epping Forest Warren Pond area Juncus 2012-09-18 1
Description:
Identifications
Species interactions

No interactions present.

Species with which Jointed Rush (Juncus articulatus) interacts

Comments

lavateraguy's picture

ID

I can't be sure, but I'd suspect J. acutiflorus - brownish not blackish tepals, and the tepals look to be acuminate.

In the field I use Poland's criterion of the number of septa per 5cm of leaf (5-10 in J. articulatus - 1-2 in J. acutiflorus).

IWoodward's picture

Thanks - I should be back at

Thanks - I should be back at the site soon so will check the number of septa and confirm if this supports your suspicion.

IWoodward's picture

Number of septa

I was back at the site yesterday (15th October) and checked the number of septa on the leaves of several plants. Most had 5-7 septa per 5 cm of leaf confirming J. articulatus based on Poland's criterion. Interestingly, one plant had c3 septa per 5cm of leaf - an abnormal articulatus? Or possibly some hybrid influence?