The leaf - blades are involute .
Are 5 -- 15 millimetres ( 0.20 -- 0.59 in ) long by 1 -- 3 millimetres ( 0.039 -- 0.118 in ) wide with its surface being pubescent and hairy .
The leaf - blades are involute and are 5 -- 15 millimetres ( 0.20 -- 0.59 in ) long by 1 -- 3 millimetres ( 0.039 -- 0.118 in ) wide with its surface being pubescent and hairy .