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Inflorescence cymose, the lower branches dichasial, the higher ones monochasial, so forming an anthela of drepania. ‘Flower’ enclosed by a reduced leaf, the sheath of which is elliptic to ovate and inflated, up to 9 mm long and 3 mm wide, and whose lamina is only 5-20 mm long; Fruit with stony pericarp, obliquely ellipsoid to obliquely obovoid, quadrangular in cross section and dorsally with an inconspicuous 4-7 mm long median ridge;


Gulf of Mexico: present Indo-Pacific: present Southern America:
Genus of two closely related species, S. isoetifolium, which inhabits the Indo-Pacific and S. filiforme, which is confined to the Caribbean and the Gulf of Mexico.


Hartog, Sea-grasses of the World. 1970: 176
in Engl., Pflanzenr. 11. 1907: 149
Dandy & Tandy - in J. Bot. 1939: 114
Benth. & Hook.f. - in Gen. Pl. 1883: 1019