Plant ID needed for blue grass

Can anymore tell me if this is Festuca glauca 'Elijah Blue' or Helictotrichon sempervirens? See two pictures attached.

Thanks.

 

http://www.google.com/imgres?imgurl...=1&ndsp=15&ved=1t:429,r:2,s:0&biw=922&bih=569

http://www.northcreeknurseries.com/index.cfm/fuseaction/plants.plantDetail/plant_id/373/index.htm

Looks more like sempervirens to me - compare the above flowers (both the shape and the arch of the inflorescence).

 

Regarding the Poaceae key:
- Glumes shorter than the first floret; lemmas awnless or awned from the tip or from a bifid apex, the awn rarely slightly dorsal. Group 3 => Festuca
- Glumes, at least the second glume as long or longer than the lowest floret; lemmas with dorsal awns or awnless. Group 4 => Helictotrichon

 

Audrey - do you have the definitions handy?

 

I looked into two different sources:
- Intermountain Flora
- eFloras (Chine part)
Of course, none is complete representation, but both agree in part of separating Poeae (Festuca) and Aveneae (Helictotrichon).

 

I was meaning the definition of glume, awn and the like.

 

There is plenty of sites with pictures (just google for "glume lemma awn").

This is a good definition site:

http://www.vplants.org/plants/glossary/poaceae.html

 

excellent! great info

 

I paid a visit to out local arboretum - just 5-minute walk - and found both species labeled. Festuca glauca 'Elijah Blue' was only leaves - about 2-dm clump. Probably it is not the time for it yet. Helictotrichon sempervirens, however, was in full blum. I pinched a spikelet from it and made a portrait.
As the key suggested: The glumes (especially, second) are about the same size as the lemma. The awn grows from the back of the lemma, not from the tip of it.

 

lucky you to be soooooooo close to a wonderful and stimulating resource