• POLYGOXACEAE 77 



2. Rumex. 354. 



Flowers dioecious, lower leaves hastate, foliage acid. 1. R. acetocella. 

 Flowers perfect, leaves not hastate, foliage not acid. 

 Wings not spiny-margined. 



Fruits 2 cm. or more wide, calyx red. 2. R. venosus. 



Fruits less than 2 cm. wide. 



Not more than one of the calyx lobes tubercled. 

 Inner perianth lobes 8-9 mm. broad, reniform. 



5. R. patientia. 

 Inner perianth lobes 5-6 mm. broad, deltoid ovate. 



4. R. altissimus. 

 Three of the calyx lobes tubercled. 



Wings 6 mm. long, blunt at the apex. 6. R. britannica. 



Wings not over 4 mm. long, acute at the apex. 



Leaves wavy-margined, dark green, not glaucescent. 



7. R. crispus. 

 Leaves fiat, light green, and glaucescent. 3. R. salicifolius. 

 Wings spiny-margined. 



One calyx segment tuberculate. spines short. 8. R. obtusifolius. 

 Three of the calyx segments tuberculate, spines long. 



9. R. percicarioides. 



1. Rumex acetocella L. Sour-dock. 

 Introduced in various localities in the state. Beatrice; Lincoln; Min- 

 den; Valentine. 



2. Rumex venosus Pursh. 



Common in dry sandy places. Antelope County; Central City; Cherry 

 County; Crowelton; Deuel County; Fairbury; Thedford; Valentine; 

 War Bonnet Canon. 



3. Rumex salicifolia Weim. 



A common weed in low moist ground. Long Pine; Scotts Bluff County; 

 Weeping Water. 



4. Rumex altissimus Wood. 



A common weed over most of the state. Bassett; Callaway; Franklin; 

 Lincoln; Ponca; Red Cloud; Wahoo. 



5. Rumex patientia L. 



A weed in waste places in the eastern part of the state. Mead; 

 Kearney. 



6. Rumex britannica L. 



Common in low ground. Burwell; Dismal River; Grant County; Keya 

 Paha County; Long Pine. 



7. Rumex crispus L. 



A common weed throughout the state. Crawford; Coon Creek; Lin- 

 coln; Red Cloud; Scotts Bluff County; Talmage. 



8. Rumex obtusifolius L. 



Mostly in the eastern part of the state. Burwell; Long Pine; Red 

 Cloud. . 



9. Rumex percicarioides L. 



A common weed all over the state. Antelope County; Belle vue; Fre- 

 mont; Grand Island; Kennedy; Mullen; Pishelville; Scotts Bluff; St. 

 Paul. 



