﻿EUSTACHYS IN NORTH AMERICA 435 



spikelets, the other with the spikelets crowded to the very base of 

 the stouter and usually shorter racemes. The essential and diag- 

 nostic details of the two groups will be found in the following key : 



Key to tlie Species. 



Spikes slender, usually naked at the base or with a few scattered spikelets. 



Mid-nerve of the third scale not pilose, but hispidulous above the middle. 



I. C. Nealleyi. 



Nerves of the third scale all pilose. 



Apex of the elliptic fourth scale acute. 2. C. tenuispica. 



Apex of the obovate-cuneate fourth scale obliquely truncate 

 Spikes stout, spikelet-bearing to the base 



3. C. verticillata 



Hairs on the nerves of the third scale short, .5 mm. or less long, not manifest and 



not extending beyond the apex of the scale. 

 Fourth scale obovate-cuneate, 3-nerved, .6 mm. wide, the apex unequally 

 rounded. 4- C. brevispica. 



Fourth scale obcuneate or triangular, 5-nerved, I mm. or a little more broad. 



5. C. latisquamea. 



Fourth scale broadly triangular, 7 -nerved, wider than long. 



6. C. cucullata. 



Hairs on the lateral nerves of the third scale long, I mm. or more in length, mani- 

 fest and decidedly extending beyond the apex of the scale. 

 Hairs on the lateral nerves of the third scale about equal in length. 



Hairs exceeding the apex of the scale, about I mm. long ; fourth scale 



I mm. wide ; upper surface of the leaves glabrous. 7. C. Texanct. 

 Hairs much exceeding the apex of the scale, 2-3 mm. long ; fourth scale 

 .5 mm. wide ; upper surface of the leaves near the base usually long- 

 hairy . 8. C. barbata. 

 ■ Hairs on the lateral nerves of the third scale unequal in length, those at the 



summit much longer. 

 Scales 4, rarely 5 ; third scale one third as broad as long, the terminal 



hairs on the lateral nerves 2.5-3 mrn - ^ on S- 9- £■ elegans. 



Scales 7-9, the upper ones much reduced ; third scale one sixth as broad 



as long, the terminal hairs on the lateral nerves about 1 mm. long. 



10. C. Prieuri. 



I. Chloris Nealleyi nom. nov. 



Chloris Tcxensis Nash, Bull. Torr. Bot. Club, 23 : 1 5 1. 1 896. 

 N °t C ciliata var. Texana Vasey. 1890. 



Culms 3-6 dm. tall, compressed, tufted, simple, or branched 

 ^ the base, erect ; nodes 2 : culm leaves about 2 ; sheaths usually 

 0n S er than the internodes, smooth, compressed, keeled ; ligule a 

 scanous ciliolate ring about .5 mm. broad; blades 2.5-15 cm. 

 on S>.3-5 mm. wide, smooth beneath, rough above and on the 

 mar gins: inflorescence exserted ; spikes 5-8, 10-18 cm. long, 



