Hosta 'Soules' Upright Green'
Oops! Sure this green hosta was labeled as H. 'Soules' Green' but this should be H. 'Soules' Upright Green'.
This non-registered cultivar of unidentified background is from Marge Soules and it forms a small, upright, rhizomatous hosta.
According to The Hostapedia by Mark Zilis (2009), "...appears identical in foliage to Hosta clausa."