172 



HORDEAE 



some of thcni liave leaves and in some the leaves are reduced 

 to basal scales. Sometimes the leaves are more or less cylin- 

 drical and hollow and again they are flattened and seem to be 

 divided crosswise into sections (septate), or they may be 

 arranged in pairs, the base of the outer and upper one en- 

 closing or straddling over that of the next one below (equit- 

 ant). The family is a large one, but not to be compared in 

 any way with the true grasses. 



III. JUNCACEAE Rushes 



KEY TO THE GENERA. 



Leaf-shealhs open; capsules 1- or 3-celled; 

 seeds many. 



Leaf-sheaths closed; capsules always 1-celled; 

 seeds 3. 



1. JUNCUS. 



2. JUNCOIDES. 



I. JUNCUS L. Rushes. 



Lower bracts of the inflorescence terete, erect, 

 appearing as a prolongation of the stem; 

 inflorescence apparently lateral. 

 Flowers few, 1 to 5, of which 1 is subsessile 



and the others pedicelled. 

 Flowers several in a more or less compound 

 panicle; seeds apiculate. 

 Plant slender; bract extending considerably 



beyond the inflorescence. 

 Plant stouter; bracts extending little if any 

 beyond the inflorescence. 

 Lower bracts not appearing as a continuation 

 of the stem, or if so, channeled on the up- 

 per sui'face; inflorescence terminal. 

 Leaves septate (septa sometimes poorly de- 

 veloped and hard to see in pressed ma- 

 terial: compare numbers 9 and 10.) 

 Leaves terete, hot equitant. 



Inflorescence with short branches; flowers 

 numerous, crowded, echinate-spread- 

 ing; capsules narrowly lanceolate; 

 heads at least some of them over 10 

 mm. in diameter. 

 Inflorescence of mostly solitary, small 

 heads (sometimes 2 or 3); flowers 

 fewer not echinate-spreading; cap- 

 sules oblons; -ic i' isnally caudate. 

 Leaves equitant, laterally flattened with 

 one edge towards ■'he stem. 

 Flower clusters numerous, small, 5-12 

 flowered, gerterally light colored. 



1. J. drummondii. 



J. balticus. 



3. J. mexicanus. 



■J. torreyi. 



J. ynei'tensianus. 



6. J. br^l,nescens. 



