triquetrous

• The _spikes_ are usually few, 2 to 6, 3 to 6 inches long, with a triquetrous, narrowly winged rachis. —  A Handbook of Some South Indian Grasses
• The spikelets are plano-convex, orbicular to oblong, obtuse, secund, 2-ranked on the flattened or triquetrous rachis of the spike-like branches of a raceme, one-flowered and falling off entire from the very short or obscure pedicels. —  A Handbook of Some South Indian Grasses
• The _inflorescence_ is a compound spike varying in length from 4 to 10 inches, erect; the main rachis is triquetrous, dorsally rounded, glabrous and very thinly scaberulous at the edges. —  A Handbook of Some South Indian Grasses
• It is a native of Albania, and belongs to that section of its extensive genus having triquetrous and obtuse leaves, or blunt three-sided foliage, as formed by a well developed keel. —  Hardy Perennials and Old Fashioned Flowers Describing the Most Desirable Plants, for Borders, Rockeries, and Shrubberies.
• 1-1/2 to 4 inches long, the lowest ones in whorls of two to four; the rachis is nearly triquetrous, laterally winged, base thickened and with —  A Handbook of Some South Indian Grasses

Allen's Synonyms and Antonyms