What’s a dichotomous key?
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  - Group 1Lycophytes, Monilophytes
 - Group 2Gymnosperms
 - Group 3Monocots
 - Group 4Woody angiosperms with opposite or whorled leaves
 - Group 5Woody angiosperms with alternate leaves
 - Group 6Herbaceous angiosperms with inferior ovaries
 - Group 7Herbaceous angiosperms with superior ovaries and zygomorphic flowers
 - Group 8Herbaceous angiosperms with superior ovaries, actinomorphic flowers, and 2 or more distinct carpels
 - Group 9Herbaceous angiosperms with superior ovaries, actinomorphic flowers, connate petals, and a solitary carpel or 2 or more connate carpels
 - Group 10Herbaceous angiosperms with superior ovaries, actinomorphic flowers, distinct petals or the petals lacking, and 2 or more connate carpels
 
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 - Dichotomous Key
 - Poaceae
 - Poaceae Group 3
 - Holcus
 
Holcus
See list of 2 species in this genus- 
      
    
  
    
      
      1a. Lower internodes of stem softly villous; awn of upper lemma 1–2 mm long, hooked, scarcely, if at all, exserted from the glumes [Fig. 234]; plants without rhizomes
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      1b. Lower internodes of stem glabrous; awn of upper lemma 3–5 mm long, bent but not hooked, well exserted beyond the glumes; plants with slender rhizomes
 
  
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    Each photo represents one species in this genus.