184 AMERICAN MIDLAND NATURALIST 
Perhaps to this species may be referred a sterile specimen 
No. 200850, collected by Krassnow, and without any further 
data except, “Flora Poltavica. Polygonwm amphibium L., Legit 
Krassnow.”’ Its leaves are scabrous on the margin but otherwise 
glabrous, indicating subriparian habit of growth. The leaves are 
deeply cordate at the base and mucronulate at the obtuse apex, 
15.5-17 cm. long and 4—4.4 cm. wide, narrowly oblong: petioles 
3-8.5 cm. long, nodes 9 cm. long. 
P. amurensts is readily distinguished by the remarkably 
large long thick leaves with deeply cordate to subauriculate base. 
The thick dehiscent rachis of the fruiting plant is also character- 
istic: the seeds are small biconvex and shining. 
Persicaria oregana Greene, var. ancoviana Nwd., nov. var. 
Planta aquatica. Folia glabra teniua elliptica vel elliptico- 
oblonga, cordata (vel abrupte cunecata) apice obtuso vel rotundato 
mucronulato, ro-11.4 longa et 4—4.7 lata: folia in superiore caule 
4.2-6.6 cm. longa et 1.7—-3 cm. lata: petioli foliorum inferiorum 
6-9 cm. longi superiorum 1.5—4.5 lati. Pedunculus 5 cm. longus, 
crassus 4.5 mm. in planta desiccata: spica ovalis 1.5 lata et 2 em. 
longa: ochreae tenues 2.5—6 cm. longae: flores rosei, bracteae 
florum vivide rubrae, omnes, praesertim in inferiore parte spicae, 
trilobatae. 
Aquatic phase. Leaves perfectly glabrous elliptical or elliptic- 
oblong, cordate or subcordate (the earliest abruptly cuneate): 
apex obtuse or rounded and mucronulate, rather thin, 10-11.4 
em. long, 4-4.7 cm. wide; upper reduced leaves dark purple in 
color, 4.2-6.6 cm. long and 1.7—-3 cm. wide: petiole 6-9 cm. long 
in the former and 1.5—4.5 cm. in the latter. Peduncle 5 cm. long 
rather thick about 4.5 mm. in dried specimen: spike ovoid 1.5 
wide and 2 cm. long: stem rooting at the nodes rather thick: 
ochreae membranous, thin 2.5—-6 cm. long: petiole somewhat 
winged above or abruptly passing into the subcordate leaf blade 
by a narrowed sinus on each side at the leaf base: flowers light 
pink; bracts dark purple red to crimson and all, but especially 
the lower triangularly 3-lobed with a clasping conduplicate 
base around each flower cluster. 
The dark purple to crimson bracts and lighter rose colored 
flowers make a striking contrast so that the budding spikes are 
more showy than the flowering ones, Beside this the peculiarly 
