OUR AMPHIBIOUS PERSICARIAS 219 
the riparian phases have been elsewhere given.* The aquatic 
phase has since been rediscovered by the writer at Luray, Va., on 
the shores of the Shenandoah River near Shortass Mountain, 
Sept. 6, 1910. Rather good specimens of riparian plants were 
growing on the shore connected by rootstocks to the floating 
aquatic plants. Another good specimen of riparian phase is in 
Mr. C. Deams’ herbarium. The lower leaves are aquatic and the 
plant emerged from the water later so that the flowering spike 
was produced on an aerial shoot. The stem is really aquatic below 
and terrestrial above. 
RIPARIAN PHASE. Lower leaves subaquatic, perfectly gla- 
brous, abruptly short acuminate, rounded, truncate, or slightly 
subcordate at the base, 8.5-10 dm. long, and 2.5-3.5 cm. wide; 
petioles 2-4 cm. long, slender; upper emerged, 15-17 cm. long 
and 4-5 cm. wide with short peticle 1.5-2 cm. long: margins 
rough as is also the midribs of the lower surface of the upper 
leaves, otherwise perfectly glabrous; peduncles minutely glandular 
pubescent 9 cm. internodes 3-9 cm. long, leaves very thin. 
A good example of the riparian plant is No. 697, collected at 
Luray, Sept. 6, 1919, and mounted on the same sheet as the 
typical aquatic phase. Mr. Deam’s plant already referred to, and 
collected at Vanemon’s Woods S. of Bluffton, Wells Co., Indiana, 
is strictly speaking to be considered as more aquatic since it has 
the lower leaves almost aquatic except for their more acute apex. 
The upper leaves are like those of the type. The spike is, however, 
very long about twice that of the eastern plant. The leaves have 
the appearance of those of P. /awrina Greene, but are much broader. 
AguaTic PHASE., Leaves perfectly glabrous, slimy and shin- 
ing, all floating rounded to subcordate at the base, simply and 
abruptly acute at the apex, (sometimes obtuse) elliptic-oblong 
or ovate-oblong, perfectly green, 7-10 cm. long, 2-4 cm. wide: 
petiole 3-5.5 cm. long, slender; stems swollen between, and just 
above the nodes, rooting in the water; internodes slightly fistulous 
4-6 cm. long: spike cylindric usually solitary 3-4 cm. long, flower 
small rose-colored to rose-red: bracts membranous somewhat 
green in the middle, acute to acuminate, glabrous, entire; peduncle 
shining glabrous with one ot two large bracted flowers above the 
middle, where it becomes very slender. 
* Greene, E. L. Leaflets, vol. i, p. 35; also Am. Mrp. NaT., vol. ii, p. 20. 
. t See also Greene, E. L. Leaflets, vol. i, pp. 106, 107. 
