NAIADACEAB 15 



9. Juncus longistylus Torr. & Gray. 



In meadows in the western part of the state. Ewing; Sheridan Coun- 

 ty; Valentine. 



10. Juncus nodosus L. 



Common, often forming a sod in wet meadows. Anselmo; Boelus; 

 Long Pine; Thedford; Valentine. 



11. Juncus torreyi Coville. 



Common in wet soil all over the state. Anselmo; Ainsworth; Chad- 

 ron; Haigler; Lincoln; Long Pine; Louisville; Minden; Mullen; Pine 

 Ridge. 



12. Juncus richardsonianus Schult. 

 Juncus alpinus insignis Fries. 



Rare in the sand-hill regions. Long Pine. 



5. NAIADACEAE. 

 Naias. 50. 



Seeds shining with 30-50 rows of faint reticulations. 1. N. flexilis. 

 Seeds dull, with 16-20 row^s of strongly marked reticulations. 



2. N. guadalupensis. 



1. Naias flexilis (Willd.) Rost. & Schmidt. 



Found mostly in the clear streams of the sand-hill regions. Cherry 

 County; Greenwood; Wood Lake. 



2. Naias guadalupensis (Spreng.) Morong. 

 In a lake near Whitman. 



ARALES. 

 Stems normal, with normal leaves. 

 Flowers in a spike or spadix. 



Spike fleshy, i. e. a spadix; flowers not accompanied by bristles; 



fruit a berry. 1. Araceae. 



Spike not fleshy; flowers accompanied by bristles; fruit not a 



berry. 3. Typhaceae. 



Flowers in globular heads. 2. Sparganiaceae. 



Stems reduced to a leaflike structure, called a thallus; leaves absent; 



whole plant submerged or floating. 4. Lemnaceae. 



1. ARACEAE. 



Scape not leaflike, flowers monoecious, leaves compound. 1. Arisaema. 

 Scape leeaflike, flowers perfect, leaves simple. 2. Acorus. 



1. Arisaema. 229. 



Leaves with three segments. 1. A. triphyllum. 



Leaves with more than three segments. 2. A.dracontium. 



1. Arisaema triphyllum (L.) Torr. Jack-in-the-pulpit. Indian Turnip. 

 Moist places in woods in the eastern part of state. Crete; Fremont; 

 Lincoln; Milford. 



2. Arisaema dracontium (L.) Schott. 



In similar places as last, but less common. Crete; Saltillo; Weeping 

 Water. 



2. Acorus. 231. 

 1. Acorus calamus L. Sweet Flag, Calamus. 



In swamps along the Missouri in the southeast corner of the state. 

 Nebraska City. 



