Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
54. Juncaginaceae, the Arrow-grass Family
1. Triglochin L. -- Arrow-grass
3. Triglochin palustris L.
Small, slender plants 1.5-4 dm tall. Leaves erect, terete, 1/2 to 3/4
the length of the plant, very slender, 0.5-2 mm wide; ligules 2-lobed,
0.5-1.5 mm long. Racemes loosely flowered, 10-25 cm long; pedicels
2-5 mm long. Flowers small, 1-2 mm across; tepals 1-2 mm long;
carpels 3, stigmas 3. Fruits linear-clavate, 5-8 mm long, ca.
1 mm thick, splitting upward from the base into 3 elongate segments, the fruit
axis 3-winged. Late Jun--Sep. Springs, fens and seepage areas, often where alkaline
or saline; occasional in ND and ne MT, uncommon s; (Circumboreal, in N.Amer.
s to ME, PA, IL, IA, NE, CO, ID and CA; also S.Amer.).
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