General Key to the Families 



XI. JUNCAGINACE^. ARROW GRASS FAMILY 



Herbs with creeping rhizomes and hollow stems, mostly peren- 

 nial; leaves alternate, sheathing, channelled or terete; flowers per- 

 fect, small, spicate, or racemose with six-lobed perianth; fruit cap- 

 sular or follicular. 



I. Triglochin. L. 



I. T. palustris. L. Marsh Arrow Grass. 



ORDER VII. GRAMINALES 



XII. GRAMINE^. GRASS FAMILY 



Herbs with culms closed at the nodes; leaves paralleled-veined, 

 consisting of a sheath and a blade; flowers perfect, very small, 

 arranged in spikelets; fruit a caryopsis with starchy endosperm 

 and a small embryo at the base. 



SUBFAMILY POACOIDE^ 

 TRIBE AGROSTIDE^ 



I. Phleum. L. 



I. P. alpinum. L. Alpine Timothy. 

 II. Calamagrostis. Adans. 



I. C. canadensis. (Michx.) Beauv. Blue- joint Grass. 



TRIBE FESTUCE^ 



III. POA. L. 



I. P. alpina. L. Alpine Spear Grass. 



IV. Festuca. L. 



I. F. ovina. L. Sheep's Fescue Grass. 

 V. Bromus. L. 



I. B. Richardsonii var. pallidus. (Hook.) Shear. 

 Fringed Brome Grass. 



TRIBE HORDED 



VI. HoRDEUM. (Tourn.) L. 



I. H. jubatum. L. Squirrel-tail Grass. 



