Three Rib Arrowgrass

Plants with fibrous strands of old leaves at base, 6--35 cm. Leaves erect from sheath, mostly longer than scapes, 4--35 cm; sheath 1.1--7.5 cm  0.7--1 mm, ligule not hoodlike, unlobed; blade 0.2--5 mm wide, apex round-acute. Inflorescences: scape green to brown, mostly exceeded by leaves, 4.5--21.5 cm  0.3--1.6 mm; racemes 0.6--20.3  0.4--1.3 cm; pedicels 0.4--2.1  0.1--0.3 mm. Flowers: tepals oval to elliptic, 0.6--1  0.8--0.9 mm, apex obtuse; pistils 6, 3 fertile, 3 sterile. Fruits: fruiting receptacle with wings; schizocarps globose to broader than long, 1--2  1.5--2.3 mm; mericarps obovate, strongly 3-keeled, 1--1.5  0.5--0.9 mm, beak reflexed, ca. 0.2 mm. Chromosome number unavailableunknown.

Ala., Calif., Fla., Ga., La., Miss., N.C., Oreg., S.C., Va.; Mexico; West Indies (Bahamas, Greater Antilles); South America (Argentina, Bolivia, Brazil, Chile, Peru).

Flowering summer-- and fall.

Coastal alkaline marshes; 0--10m.

Triglochin striata R. & P. Fl. Per.
Triglochin triandra Michx. Fl. Bor. Am. 1 : 208. 1803. Triglochin mexicana H.B.K. Nov. Gen. & Sp. 1 : 244. 1815.
Rootstocks upright or oblique. Scapes 1 or 2, more or less angular, usually not over 0.3 m. high; leaves slender, slightly fleshy, nearly or quite as long as the scapes, 0.5-2 mm. wide; flowers very small, light-yellow or greenish, in narrow racemes; pedicels 1-2 mm. long, not elongating in fruit ; perianth-segments 3 ; oval or ovate, obtuse, less than 1
mm. long; stamens 3; anthers oval, large; pistil of 3 united carpels; fruit subglobose or somewhat obovoid, about 2 mm. in diameter, mostly thicker than long, appearing 3-winged when dry by the contracting of the carpels ; carpels coriaceous, rounded and 3-ribbed on the back ; axis broadly 3-winged.
Type locality: Surco, Peru.
Distribution : Maryland to Florida and Louisiana ; middle and southern California ; Mexico ; also in South America.

Triglochin striata is a plant native to New Zealand, South America, America, Africa, Australia and Southern Portugal.

It is a perennial with parallel lines on its narrow linear leaves, which gives rise to its common name streaked arrow grass. Other common names include three-rib arrowgrass and three-ribbed arrow-grass.