268 33. Bistorta. 15. POLYGONE^. Pl.ex.mon. 



2. Bistorta vivipara. Childing S7iakeweed. 



Leaves lanceolate, margin revolute ; spike linear ; fiowers 

 often gemmiparous. 



Bistorta minor, Raii Syn. 147,2; Ger. em. 399,2. 

 Bistorta minor nostras, Park. 392. 

 Polygonum viviparum, Lin. S. P. 516. 



Small bistort. Small snakeweed. 



Fields and pastures ; perennial ; June and July. 

 Stem 9 in. high; spike obtuse ijiotvers rosy; lower flowers 

 bulbiferous. 



/3. alpina. Radical leaves roundish, minutely serrated. 



Bistorta minima Alpina, foliis imis subrotundis et m.inutissime serratis, 

 Raii Syn. 147,3. 



Bistorta Alpina pumila varia, Park. 392. 



II. 34. PERSICARIA. Pliny. Peachwort. 



Perigonium 3 to 5-parted, persistent ; stamens 5 to 7 : 

 JUaments connected by a gland, 3 or 4- at the sinus of the 

 lobes, the others opposite to the sides of the ovary; styles 2; 

 stigmata 2, blunt ; thecidium ovate, compressed ; corculum 

 lateral ; cotyledons accumbent. — Stem much branched ; 

 ocre(B 1 or 2-valved, 2 or S-flowered ; Jlowers spiked ; spike 

 terminal or axillary. 



1, Persicaria amphibia. Amphihious^ peachwort. 

 Leaves lanceolate, acute, serrulate, bald, heartshape at 



bottom. 



Persicaria salicis folio perennis, potamogiton angusttfolium dicta, Raii 

 Syn. 145, 9. 



Potamogiton angustifoliiim, Ger. em, 821, 2. 

 Fontalis major longifolia, Park. 1254, 1 a. 

 Polygonum amphibium, Lin. S. P. 517. 

 Narrow-leaved pondweed. 



Watery places ; perennial ; July and August. 



Stem floating ; stipules entire ; leaves pleasant green, 

 glossy, edge aculeated ; Jlowers pedicelled ; stamens shorter 

 than the lobes of the perigonium. 



&. terrestris. Stem erect; leaves dark, rough; stamens 

 longer than the lobes of the perigonium, 



2. Persicaria acris. Sharp peachwort. 

 Stem upright; leaves bald, smooth, lanceolate, spotless; 



stipules fringed; spikes filiform, drooping; style cloven. 



