216. § -HEXANDRIA., MONOGYNIA. | 
unequally inserted, 3 of them upon the summit ? 
of the tube. Utriculus muricate, 1-seeded. et ge 
Aquatic plants; leaves partly radical, of a form betwixt 
cordate and sagittate; scapes unifoliate; flowers aggre- 
gated in spikes, or fastigiated in unequal umbells, colour 
blue, upper lip marked with a discoloured spot. : : 
Species. 1. P. cordata. Has. Chiefly within the limits 
of tide-water, throughout the Atlantic coast. Oss. Leaves 
sheathing, sheath entire; petiole about one third the 
length of the leaf. Spike at first protected by an ovate 
spathe, pubescent. Flowers aggregated by 5’s and 4’s, 
sessile, bilabiate, upper lip flat, 3-toothed, blue with a 
greenish variolate spot in the centres lower lip 3-paried; 
tube curved, about equal in length with the limb, marked 
with 6 longitudinal striz, and on the under side singuiarly 
_ perforated with 3 gashes or longitudinal foramina. Sta- 
-- mina 6, 3 near the base and 3 towards the summit of the | 
tube; the S-exserted staminaof the lower lip variabie in 
length. Style filiform, blue, marescent with the corolla 
and usually about its length, shortest when the stamina 
are most exserted; stigma entire, minute. Germ rather 
gibbous, ovate, l-seeded. Fruit a l-sceded, greenish, mu- 
ricated utriculus formed by the persistent calicing base of 
the corolla; cristated ridges of the fruit 6. sperm 
_ ovoid, conic, very white, sweet and farinaceous, (probably 
nutritious.) Corculum in the axis of the perisperm, cylin- 
dric, inverted, (or with the rad.cal upwards); gemmuala ¢ 
- oval, conspicuous. : 
2. angustifolia. Pursh. Flor. Am. 1. p. 224. Leaves 
acute, elongated-triangular, base tr te-subcordate, seg- 
ments of the lower lip of the corolla linear-lanceolate.—1n 
subalpine lakes on the Alleghany mountains. New York, 
&e. PP. mucronata? Rafinesque New York, Med. Repos. 
2. p. 352. 
3. * lanceolata. Leaf narrow, oblong-lanceolate, obtuse, 
base entire, petiole very short; spike short. Han. Near 
Savannah in Georgia—Dr. WW. Baidwyn. Also in South 
_ Carolina. Scape less than a foot long; spathe very obtuse. 
Leaf nearly a span long, about an inch wide, very , 
_ in P. cordata the leaf is diaphanous when held to the light. 
~ Corolla blue, segments of the lower lip linear, longer than 
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