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‘* Yellow dock.” Native of Europe, now 
naturalized. 
3. KR. conetomEratus Murray. Calyx valves 
entire, bearing callosities; leaves lanceolate, 
the lower leaves cordate, slightly undulate. 
2f. Common. Spring. 
Also called ‘yellow dock,” native of Europe, 
and at present naturalized. 
4. BR. optustrorius L. Calyx valves with 
slender awn-like teeth and bearing callosities. 
2. Contra Costa. Spring. 
7. BR. acetoserta L. Dicecious. Valves 
without callosities; leaves hastate.—2¢. Com- 
mon. Spring. ‘‘Sheep-sorrel.” 
2. Polygonum L. KNor-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. panonyonia Cham. & Schlecht. Flow- 
ers in leafy spikes; leaves lanceolate, with re- 
volute margins; flowers pale, veined with green. 
2¢. San Francisco. Summer. 
2. P. avicutare L. Flowers axillary, pale. 
—@. Common. Spring, Summer. 
8. P. Cauirornicum Meissn. Flowers spi- 
cate; bracts foliaceous, each bract containing 
