HORDEAE 161 



2. Cyperus cyrtolepis Torr, and Hook. Uncertainly New 

 Mexican but occuiTing both east and west of us. 



3. Cyperus rusbyi Britton. One of our commonest and 

 most important species; in the mountains almost throughout the 

 State; in the Ui^per Sonoran and Transition Zones. 



4. Cyperus fendlerianus Boeckl. Common in the moun- 

 tains throughout tlie State; in the Uj^pcr Sonoran and Transition 

 Zones. 



5. Cyperus uniflorus Torr. and Hook. Not common; comes 

 in from Texas ; in the Upper Sonoran Zone. 



6. Cyperus SpeciOSUS Vahl. An introduced weed in culti- 

 vated lands, not yet common; in the Sonoran Zones. 



7. Cyperus esculentus L. Nut Grass. Another introduced 

 weed in cultivated valleys at the lower levels though tr.'^o oc mriing 

 higher up; not zonally restricted. 



8. Cyperus erythrorhizos Muhl. Also an introduced weed, 

 known as yet only from the MesiKa Valley but probably fairly 

 common in other cultivated and irrigated valleys. 



A few other species have been referred to New Mexico which 

 probably do not come into the State. The mistakes are due to in- 

 correct determination of species or to the incomplete character of 

 some of the labels of the older collections. 



2. CLADIUM K. Br. 



Coarse perennial leafy herbs with cylindric stems, 4 to 5 

 feet tall; spikelets sma'.l, in large many-branched terminal panicles: 

 glumes overlapping, the lower empty, the middle with unisexual 

 flowers, the upper ones with perfect flowers: perianth none; stamens 

 2 or 3 ; style not persistent: achene ovoid to globose, smooth or 

 ridged If ngthwu^e 



I. Cladium pamaicense Crantz. A tall reed-iike sedge 



growing in water. Collecttd twice in the Pecos Valley near Ros- 

 well, which is its most western extension of range. 



