categoryZGrasses Grasses List 

SHARP-FLOWERED RUSH

Juncus acutiflorus

Rushes Family [Juncaceae]

month8jul month8july month8aug

category
category8Grasses
 
status
statusZnative
 
flower
flower8brown
 
inner
inner8yellow
 
morph
morph8actino
 
petals
petalsZ6
(3 + 3)
type
typeZpanicle
 
stem
stem8round
 
sex
sexZbisexual
 

16th Aug 2011, Portobello, Dublin, Ireland Photo: © Paula O'Meara
It grows to just above 1m high differing from the otherwise very similar Jointed Rush in having a larger and more branched inflorescence.


16th Aug 2011, Portobello, Dublin, Ireland Photo: © Paula O'Meara
It also differs from Jointed Rush in having smaller tepals (aka petals) which are between 1.5mm to 2.7mm and coloured a mid to dark-brown (c.f. tepals of Jointed Rush which are 2.3 to 3.5mm which are dark-brown to blackish). It also has longer rhizomes than Jointed Rush - but you may have to dig both up for comparison...


16th Aug 2011, Portobello, Dublin, Ireland Photo: © Paula O'Meara
The tepals taper to a long tip (whereas the outer tepals of Jointed Rush are acute (sharply pointed but the inner tepals between acute and sub-acute).


16th Aug 2011, Portobello, Dublin, Ireland Photo: © Paula O'Meara



Hybridizes with : Jointed Rush (Juncus articulatus) to produce Juncus × surrejanus which is commoner than either parent in some places and intermediate in both the shape and size of the tepals.

It also hybridizes with Bulbous Rush (Juncus bulbosus) to produce J. acutiflorus × J. bulbosus, which has no common name - mainly because it is very rare - once found in just two places: MW Yorkshire and Westmorland!

Some similarities to : many other Rushes (Juncus species)!

Wanted : photos of the flowers with stamens.


  Juncus acutiflorus  ⇐ Global Aspect ⇒ Juncaceae  

Distribution
 family8Rushes family8Juncaceae
 BSBI maps
genus8Juncus
Juncus
(Rushes)

SHARP-FLOWERED RUSH

Juncus acutiflorus

Rushes Family [Juncaceae]