POLYGONACEAE 17 
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. 
Mature calyx 2 cm. or more wide, red. 2. R. venosus. 
Mature calyx 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 flat, 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; Bellevue; Fre- 
mont; Grand Island; Kennedy; Mullen; Pishelville; Scotts Bluff; St. 
Paul, 
