1	"Annual; inflorescence a generally emergent spike of bisexual and sometimes staminate flowers + 2 submerged, long-styled, sessile pistillate flowers enclosed in leaf sheath at base of scape; perianth parts 0 or 1; stamens 0 or 1; carpels 0 or 1, fertile"	"Triglochin scilloides"
1	"Perennial herb; inflorescence an aerial raceme of bisexual flowers; perianth parts generally 6; stamens 1, 3, 6, occasionally fewer; carpels 6, all or 3 fertile"	2
2	"Fertile carpels, mericarps 3"	3
2	"Fertile carpels, mericarps 6"	4
3	"Fruit 5--7(9) mm; mericarps weak-ridged abaxially; rhizome +- stout; plant tufted; c&s SNH, 2100--3450 m"	"Triglochin palustris"
3	"Fruit 1--1.5 mm; mericarps strong-3-keeled abaxially; rhizome slender; plant mat-forming; NCo, CCo, n SCo, < 30 m"	"Triglochin striata"
4	"Plant dense-tufted, (1)4--11 dm; rhizome stout; ligule tip entire to +- notched, (1)1.5--5 mm; leaf +- elliptic in &times;-section, generally 2--5 mm wide"	"Triglochin maritima"
4	"Plant loose-tufted to mat-forming, 1--6 dm; rhizome +- slender, often creeping; ligule tip deep-2-lobed, 0.5--1.5 mm; leaf +- round or semicircular in &times;-section, generally 1--2 mm wide"	5
5	"Plant generally 1--3(4.5) dm; inflorescence generally >= leaves; salt marshes; NCo, CCo, SCo"	"Triglochin concinna var. concinna"
5	"Plant (1)3--5(6) dm; inflorescence generally >> leaves; alkaline meadows, seeps, mudflats, stream and lake margins; ne KR, n CaRH, s SNH, GB, DMoj"	"Triglochin concinna var. debilis"