Key to the species of Grateloupia

1	Plants bladelike	2
1	Plants not bladelike; with percurrent axes, irregularly pinnately branched, growing in sandy-rocky areas with fresh-water intrusion	G. filicina(Lamouroux) C. Agardh
2	Blades about 1 cm in diam. through broad subdichotomies, narrowing or divided toward top; rusty red	G. hawaiiana Dawson
2	Blades with naked axes about 1/2 total height, topped by subdichotomously divided segments, tapering to attenuate tips; bleached yellowish if mid-tidal, deep red if low intertidal	G. phuquocensis Tanaka & Pham