H É i t a a s a s a T o
POTAMOGETON DIVERSIFOLIUM.
VARIOUS-LEAVED POND WEED. SMALLEST POND WEED.
Tetrandria Tetragynia, Linn. Najaides, Juss.
GENERIC CHARACTER.
Calix 4-leaved. Corolla 0. Style 0. Seeds 4. Leaves sheathing; those of the stem
often attenuated, floral leaves mostly opposite; flowers spiked, terminal, or
axillary; ramuli and spikes having frequently two sheathes at the base.
Nutt one-seeded, cochleated; embryon erect, exalbuminous, curved, involuted.—
Nutt.
SPECIFIC CHARACTER.
Plant small, delicate ; stem filiform, emersed; floating leaves elliptical, petiolated,
half an inch long, six-nerved; submersed leaves sessile, filiform, long; spikes
numerous, small, depressed, in the axills of the leaves.—B. Prod. FI. Ph.
A s in g u l a r and delicate little plant. Upper leaves about half an
inch long, and not quite a quarter wide, elliptical, somewhat convex
on their disk, dark, shining sap-green, six-nerved, (rather six-grooved,
the nerves being depressed,) petioles very short. Submersed leaves
very delicately filiform. Stem filiform. Flowers few, borne on axillary,