JUNCAGINACEAE 



Triglochin Arrow-grass 



Plants of freshwater and saltwater marshes, perennial, arising 

 from a short rootstock, some producing stolons; leaves slightly fleshy 

 and rush-like; flowers in a spike-like raceme; fruit follicular, splitting 

 into 3-6 carpels from a persistent central axis. 



Key to Species 



1. Leaves typically equaling scape (fig. 1 A), very slender, curving out- 

 wards from the sheath at 30-40 degree angle (fig. IB); spike 2-7 cm 

 long. 

 1. T. gaspense 



1. Leaves typically shorter than scape (figs. 2A,E), slender to thickish, 

 erect from sheath (fig. 2B); spike 6-45 cm long. 



2. Carpels and stigmas 3; mature fruit 1.0 mm thick, about 5-7 times 

 as long as broad; stolons present, filiform, bearing small bulbs. 



2. T. palustre 



2. Carpels and stigmas 6; mature fruit 2.0-3.0 mm thick, about 2 times 

 as long as broad; stolons absent. 

 3. T. maritimum 



\. Triglochin gaspense Lieth and D. Love Fig. 1, Map 1 



Rare in salt marshes of Washington County, Maine. This dwarfed 

 species has been recently described (Love and Lieth, 1961) from eastern 

 North American and should be looked for along the coast of northern 

 New England where it may be more abundant than reported. In con- 

 trast to the clumped habit of T. maritimum, \)\3.r\tsoiT. gaspense ier\d 

 to form lawn-like patches in the salt marsh. Range extends locally 

 from Newfoundland south to the Gaspe'' Peninsula, Quebec, Prince 

 Edward Island, New Brunswick, and Washington Co., Maine. 



2. Triglochin palustre L. Fig. 2, Map 2 



Widely scattered along coastal marshes of Maine, rare inland 

 along the Aroostook River where it was last reported in 1940. Two his- 

 torical records from Rhode Island are known, the most recent being 

 1878. Range extends from Greenland and Labrador west to Alaska, 

 south to Rhode Island, southern New York, northwestern Pennsylva- 

 nia, northern Ohio, Illinois, Nebraska, Colorado, New Mexico, and 

 California. 



