Eragrostis 



Festuceae 



109 



50 



Map 163 



Eragrostis pectinacea (Michx.) Nees 



Annuals. 



Keels of glumes and lemmas more or less glandular. 



Spikelets 2.5-4 mm wide; anthers 0.5 mm long 3. E. cilianensix. 



Spikelets about 2 mm wide; anthers 0.2 mm long. (See excluded species no. 49, 



p. 1026.) E. poaeoides. 



Keels of glumes and lemmas not glandular. 

 Sheaths generally longer than the internodes; spikelets of lateral branchlets 

 spreading; spikelets of terminal panicles 2-5-flowered. 

 Culms branching only at the base; pedicels of lateral spikelets mostly 5-10 



mm long or longer; grain with a longitudinal groove 4. E. capillaris. 



Culms branching at the base and at each node or nearly so; pedicels of 

 lateral spikelets mostly 1-3 mm long; grain without a longitudinal 



groove 5. E. Frankii. 



Sheaths shorter than the internodes; spikelets of lateral branchlets appressed 

 or only slightly spreading; spikelets of terminal panicles usually 5-16- 

 flowered (shade forms often 2-5-flowered). 



Lateral nerves of the lemmas plainly visible, at least at the base 



6. E. pectinacea. 



Lateral nerves of the lemmas not plainly visible. 



Lemmas obtuse, their sides glabrous. (See excluded species no. 48, p. 1026.) 



E. pilosa. 



Lemmas subacute, their sides more or less scabrous. (See excluded species 

 no. 47, p. 1026.) E. mexicana. 



1. Eragrostis hypnoides (Lam.) BSP. Creeping Eragrostis. Map 158. 

 Infrequent throughout the state but more frequent in the southwestern 

 part where its habitat is more frequent. It is found on sandy or gravelly 

 bars in ditches, creeks, and rivers and on the sandy shores of lakes. It is 

 also found in muddy habitats along streams and in dried-up ponds and 

 sloughs. In the latter habitats it often forms large mats. 



Que. to Wash., southw. through Mex. and W. I. to Argentina; not found 

 in the Rocky Mts. 



2. Eragrostis spectabilis (Pursh) Steud. {Eragrostis pectinacea of 

 Gray, Man., ed. 7, Britton and Brown, Illus. Flora, ed. 2, and Eragrostis 

 spectabilis var. sparsihirsuta Farw.) Purple Lovegrass. Map 159. This 

 species is frequent to rare in sandy to very sandy soils throughout the 



