The name means: becoming tree like.  Native ofEastern USA.  With long thin stems arising from a basal stool and having rough dull green leaves.  The straight species has only small dull white fertile florets and has little garden merit, however many cultivars also have showy sterile florets

Gardens found in the 28 pre 2000 surveyed:  DA LHS EBG KEW GN WAK CBG JK LAG WS TR MS WR

Gardens found in the 10 surveyed in 2010:  EBG WS HIL  AA KAL AW

UKPlant Finder 2012 = 5 nurseries