VASCULAR PLANTS. 143 



35. Hordeum, L. 



Spikelets 1-flowered, with the rudiment of a 

 superior flower, tern ate; the central spikelet £ ; 

 the lateral ones depauperate. Glumes 2, linear- 

 lanceolate, aristate, all anterior. Palets 2; lower 

 concave, aristate. 



. U . leaves flattened ; spikelets represent- 

 ing a single spike. 



36. Elymus. L. 



Spikelets 1 — oo-flowered, all Q ; flowers dis- 

 tichous, the uppermost rudimentary. Glumes 

 2, equal, anterior. Palets 2, lower concave. 

 Ovary hirsute. 



2£ . leaves flattened; spikelets representing a 

 single spike. 



37. Gymnostichum, Schreb. 



Spikelets 1 — 4-flowered; flowers remote, the 

 uppermost rudimentary. Glumes rudimentary, 

 often wanting. Palets 2; lower aristate, em- 

 bracing the upper. 



%. Leaves flattened; spikelets representing a 

 spike. 



Family C. Cyperacese. 



Stem a calamus. Leaves all radical, sheath- 

 ing but not split at the base; lamina parallel- 

 veined. Anthers basifixed. 



