I found a source for turtle grass and shoal grass.
Thalassia testudinum (Turtle grass)
Kingdom: PLANTAE Division: ANTHOPHYTA Class: MONOCOTYLEDONEAE Order: HELOBIAE Family: HYDROCHARITACEAE Genus: Thalassia Species: testudinum PHYSICAL DESCRIPTION Leaves are flat and linear (strap-like) Leaf blades are 10- 12 mm long and 4. 5- 10 mm wide Rhizomes are scaly
aquaticusplants.com
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