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"Yellow dock." Native of Europe, now 

 naturalized. 



3. K. CONGLOMERATE Murray. Calyx valves 

 entire, bearing callosities; leaves lanceolate, 

 the lower leaves cordate, slightly undulate. 

 2. Common. Spring. 



Also called "yellow dock,' 7 native of Europe, 

 and at present naturalized. 



4. R OBTUSIFOLIUS L. Calyx valves with 

 slender awn-like teeth and bearing callosities. 

 1C Contra Costa. Spring. 



7. E. ACETOSELLA L. Dioecious. Yalves 

 without callosities; leaves hastate. 11. Com- 

 mon. Spring. "Sheep-sorrel." 



2, Polygonum L- KNOT-GRASS. 

 Perigonium 5, sometimes 4-phyllous. Sta- 

 mens 3-8, single or in pairs opposite to the 

 sepals. Styles 3, sometimes 2; stigmas capi- 

 tulate. Fruit a 3-cornered or lenticular akene, 

 enclosed in the persistent perigonium. 



1. P. PARONYCHIA Cham. & Schlecht. Flow- 

 ers in leafy spikes; leaves lanceolate, with re- 

 volute margins; flowers pale, veined with green. 

 1$. . San Francisco. Summer. 



2. P. AVICULARE L. Flowers axillary, pale. 

 0. Common. Spring, Summer. 



3. P. CALIFORNICUM Meissn. Flowers spi- - 

 cate; bracts foliaceous, each bract containing 



