15 



A. First glume 1/4-1/3 as long as the second; inflorescence only partially 

 exserted from upper sheath V. myuros 



A. First glume 2/3-3/4 as long as the second; inflorescence well extended 

 from upper sheath V. octoflora 



1. V. octoflora (Walter) Rydberg (figure 12) Common Six-weeks-grass 



Annual. Ledges and sandy shores. Southeastern N.H.; rare. Our 

 plants belong to var. tenella (Willd.) Fern. 



2. V. myuros (L.) K. C. Gmel. Rattail Six-weeks-gi^ass 



Annual. Waste places. Southeastern N.H.; rare. Introduced from 

 Europe. 



5. PUCCINELLIA AlkaU Grass 



A small genus similar to Glyceria, mostly of wet sites, saline or 



freshwater. Plants with slender culms, weak and decumbent or procumbent; 



contracted panicles with small spikelets, awnless; lemmas rounded on back. 

 Two species treated by Fernald (1950) in Glyceria (G. fernaldii and G. 



pallida) are treated by Church (1949) in the genus Torreyochloa but are 



treated here in the genus Puccinellia (see Clausen, 1952; Voss, 1966). 



A. Nerves of lemmas obscure 



B. Plants 1.5-10 dm tall; spikelets 5-12 mm long; lower glume 2.0-2.5 

 (3.0) mm long; upper glume (2.5) 3.0-4.0 (4.5) mm long; anthers 

 1.5-2.2 mm long P. maritima 



B. Plants 0.2-4.5 dm tall; spikelets 3-7 mm long; lower glume 1.0-2.0 

 (-2.5) mm long; upper glume 1.5-2.5 (-2.8) mm long; anthers 

 0.5-1.0 mm long P. paupercula 



A. Nerves of lemmas prominent 



C. Plants 1-6 dm tall; blades 1-3.5 mm wide; spikelets 3-5 mm long; 

 lemmas 2-2.8 mm long P. fernaldii 



C. Plants 3-10 dm tall; blades 4-10 mm wide; spikelets 5-7 mm long; 

 lemmas 2.5-3.5 mm long P. pallida 



1. P. maritima (Huds.) Pari, (figure 14) 



Perennial. Saltmarshes and brackish shores. Coastal N.H.; frequent. 



2. P. paupercula (Holm.) Fern. & Weath. (figure 13) 



Perennial. Brackish shores. Seacoast region; rare. 



Our plants belong to var. alaskana (Scribn. & Merr.) Fern. & Weath. 



3. P. fernaldii (Hitch.) E. G. Voss (figures 15 and 17) 



Perennial. Shallow water and wet open places. Throughout the 

 state; occasional. 



4. P. pallida (Torr.) Clausen (figure 16) 



Perennial. Shallow water and wet open places. Southeastern N.H.; 

 occasional. 



