RUSH FAMILY 313 



1. Flowers in an open panicle; stems 1-4 ft. high J '. parviUdrum 



2. Flowers in a head or spike 



a. Spikes 1-2, nodding /. spicdtum 



b. Heads 2-several, erect J. intermedium 



Juncus Linne 1753 Rush 



(Lat. juncus, rush, from jungo, bind, from their use) 



PI. 44, fig. 12, 13. 



Perianth of 6 similar, greenish-brown parts, stamens 6 or 3, ovary 1- 

 celled or 3-celled, stigmas 3, capsule usually many-seeded ; flowers small, 

 yellow, greenish, in panicles or corymbs or in dense heads or spikes ; leaver 

 terete, channelled or grass-like ; perennial. 



1. Leaves with internal cross-walls showing as 



bands or knots, especially when the leaf is 

 pinched in the fingers 



a. Leaves roundish, or but slightly flattened 



( 1 ) Stamens 3 ; seeds tailed /. Tweedyi 



(2) Stamens 6; seeds merely pointed 



(a) Parts of the perianth and capsule point- 



ed or acute 

 x. Inner perianth parts longer than the 



outer /. nodosus 



y. Inner perianth parts shorter than the 

 outer 

 (x) Capsule with beak a little longer 



than the perianth /. Torreyi 



(y) Capsule with beak shorter than the 



perianth /. nevadensis 



(b) Parts of the perianth and capsule obtuse J . richardsonidnus 



b. Leaves distinctly flattened and equitant 



(1) Stamens 3 /. ensifolius 



(2) Stamens 6 



(a) Heads solitary /. mertensidnus 



(b) Heads 2 or more /. saximontanus 



2. Leaves without knots or cross bands 

 a. Flower-cluster terminal 



(1) Flowers solitary in panicles 



(a) Stems much branched and leafy /. bufonius 



(b) Stems not branched, naked 

 x. Leaves flat 



