PLANTS FROM VARIOUS PLACES 183 
in all its parts. The upper rachis of 7. virginiana is always glabrous, 
and only slightly scabrous below. The whole inflcrescence is at 
least hirtellous. 
The type in the U. S. National Herbarium No. 516,653 from 
Kachin Hills, in Upper Burma, dated 1897, and collected by 
Shaik Mokim. 
Persicaria amurensis Nwd., sp. nov. 
Planta aquatica. Caulis foliosus 2 dm. longus vel longior: 
folia petioli et pedunculi crassi: folia 7.2-12 cm. longa et 3.2-4.5 
lata, glabra, oblonga vel oblongo-elliptica, cordata vel subauricu- 
lata, cum apice rotundato mucronulato vel obtuso: venae omnes 
praesertim vena media protrudentes: rachis percrassa (4-5 mm. 
diametro): spicae duae, 3-4 cm. Icngae; pedunculus 5 cm. longus, 
atque, fructu maturato, usque ad 8 cm. attingens: bracteae per- 
tenues, membranaceae, et pellucidae. Partes inflorescentiae omnes 
post fructum maturatum citius dehiscunt! Internodi 4-5 cm. 
longi. Planta terrestris mihi omnino ignota. 
Aquatic Phase. Plant large and stout, leafy part 2 dm. or 
more in length; leaves thick as are also the peticles and peduncles; 
leaves 7.2-12 cm. long, and 3.2—-4.5 cm. wide, perfectly glabrous, 
oblong to oblong-elliptic, slightly broader nearer the base, which 
is deeply cordate to subauriculate, the auricle 1.2 cm. long. Apex 
round or very obtuse and in the former case slightly muscronulate. 
Midvein very prominently protruding on the lower surface as also 
the other veins which branch from it regularly parallel with one 
another and anastomosing into two curved veins at the margin: 
Rachis very thick, about 4-5 mm., all the parts completely de- 
hiscent: spikes two, about 3-4 cm. long, peduncle 5 cm. long, 
lengthening to 8 cm. in fruit: bract very thin, transparent, mem- 
branous, and, with the flowers, completely dehiscent; stems 
somewhat swollen, rooting at the nodes: internodes 4—5 cm. long. 
This plant belongs to the amphibia group and seems to be 
normally aquatic. Its remarkable aspect and even the vegetative 
characters make it at once distinct from all our European and 
American amphibious Persicarias. The terrestrial phase, if it 
has one is unknown. The type is in the U. S. National Herbarium 
No. 273744, labelled “Ex Herbario Horti Petropolitani,” and | 
collected by S. Korshinsky in 1891 along the Amur River in 
Manchuria. 
