TECHNICAL DESCRIPTION: 



Plants 1.5-4 (6) dm. 

 tall, often less than 3 

 dm. tall, tufted from a 

 creeping rootstock. 

 Leaves erect to curved- 

 spreading, nearly terete, 

 1/3 to 3/4 the length of 

 the plant, 0.5-1(1.5) mm 

 wide; ligules deeply 2- 

 lobed, the lobes rounded 

 or acute, often 

 overlapping, 1-2 mm long. 

 Racemes are loosely to 

 rather densely flowered, 

 (5) 10-25 cm long; 

 pedicels 1-5 mm long. 

 Flowers are ca. 3 mm 

 across; tepals 1-2 mm 

 long; carpels 6, stigmas 

 6. Fruits cylindric, 3-5 

 mm. long, 1.5-2 mm thick, 

 splitting into 6 oblong 

 segments, the fruit axis 

 terete (Larson 1993) . 



Figure 13. Graceful arrowgrass 

 ( Triqlochin concinnum var. debile ) 

 illustration 



LOCAL FIELD CHARACTERS: Two other species of arrowgrass are 

 in central and eastern Montana. Graceful arrowgrass differs 

 from ( Triqlochin palustris ) in having 6 carpels and stigmas, 

 rather than three, and having a short cylindrical fruit 

 rather than one which is linear and club-shaped on top. 

 Both look alike vegetatively and in flower, so mature fruits 

 are needed in making the distinction. Graceful arrowgrass 

 differs from ( Triqlochin maritima ) in having deeply 2-lobed 

 ligules rather than entire ligules, leaf blades nearly 

 cylindrical in outline and less than 1 mm wide rather than 

 somewhat flattened and 1.5-3 mm. wide, and plants usually 

 less than 3 dm tall rather than usually over 3 dm. Note: 

 All three species are likely to be found in similar habitat, 

 and may sometimes occur together at the same site. 



D. 



GEOGRAPHICAL DISTRIBUTION 



RANGE: Graceful arrowgrass ranges from British Columbia to 

 Mexico; also in South America. It extends eastward to North 

 Dakota and Arizona. In Montana, it has been collected from 

 Garfield, Jefferson, Madison, McCone, Phillips and Teton 

 counties. 



