58 PINK ORDER 



y. Achenes enclosed in the calyx or near- 

 ly so 

 (x) Stems branched throughout; sta- 

 mens 3-6 P. ramosissimum 

 (y) Stems branched from the base; sta- 

 mens 8 P. ten ue 

 (b) Flowers and fruits hanging P. Douglasi 

 (3) Clusters really axillary but forming a 

 terminal spike-like cluster by the re- 

 duction of the upper leaves or the ag- 

 gregation of the flowers 



(a) Raceme long, slender and interrupted P. spergnlariforme 



(b) Raceme short and crowded, head-like 

 x. Plants mostly 1-10 cm. high; floral 



leaves broadly white-margined ; sta- 

 mens 8 p. polygaloides 

 y. Plants mostly 10-20 cm. high ; floral 



leaves green ; stamens 3-5 P. Wdtsoni 



Rumex Linne 1753 Sorrel, Dock 



(Lat. name of the sorrel) 



PI. 8, fig. 8. 



Sepals 6, the 3 inner mostly developed into wings in fruit, green, petals 

 none, stamens 6, ovary 1-celled, style 3-parted, stigmas shield-shaped, tufted, 

 fruit a 3-angled achene with wings, either entire, or with bristle-like teeth, 

 flowers perfect, dioecious or polygamo-monoecious, whorled on jointed 

 stalks in racemes or panicles ; leaves entire or wavy-margined, the sheaths 

 (\lindric, brittle and disappearing; perennial or annual. 



1. Leaves arrowshaped, sour; flowers dioecious R. aceto sella 

 Leaves not arrowshaped 



a. Leaves sour ; flowers dioecious R. paucifolius 



b. Leaves not sour ; flowers mostly perfect 



(1) Valves of the fruit, i. e. the 3 inner en- 

 larged sepals, 10-30 an. wide, usually 

 reddish 



( a j Valves 15-30 mm. wide R. venosus 



(b) Valves 10-15 mm. wide 



x. Valves ovate ; achene 5-6 mm. long R. hymenosepalus 

 y. Valves reniform ; achene 10 mm. long R. salinus 



(2) Valves of the fruit less than 10 mm. wide 



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