61. 
29. Pistillate spikes short, oblong 
or linear, erect or, if drocping, 
either on long capillary peduncles 
or with the perigynia sharply 
trigonous. 
30. Perigynia with numerous 
fine impressed nerves. 
Expected (Oligocarpae, Griseae). 
30. Perigynia with few to many 
strongly raised nerves. 
31. Perigynia rounded at 
the base, suborbicular 
in cross-section, loosely 
enveloping the achenes. 
Expected (Granulares). 
31. Perigynia tapering at 
the base, trigonous, 
closely enveloping the 
achenes. 
32. Rootstocks elongate, 
often with long 
horizontal stolons. 
Expected (Paniceae). 
32. Rootstocks not 
elongate, without 
long horizontal 
Stollonse.eedece sede Laxitlonrae) i (pis 66) 
Keys to the Species 
Section Squarrosae. 
1. Perigynia shorter than the rough-awned scales, 14-20- 
ribbed; terminal spike usually staminate, narrowly 
linear, .5-2.5 mm. long; ligule not longer than wide 
or slightly so; achenes about 1.5 mm. long..........-. C. frankii 
1. Perigynia much longer than the scales, several-ribbed 
above; terminal spike with pistillate flowers above, 
staminate ones below; ligule much longer than wide; 
achenes 2.2-3 mm. long. 
