Nassella tenuissima (Trin.) Barkworth

• a tufted long-lived grass with upright growing 25-70 cm tall.
• its linear leaves are very slender (less than 1 mm wide).
• its seed-head is an open but slender branched panicle (10-30 cm long) with many flower spikelets that are borne singly.
• these flower spikelets (5-11 mm long) are elongated in shape and topped with a very long awn (50-90 mm long).
• the mature seed has a ring of tiny hairs (0.2-0.3 mm long) where the bent and twisted awn attaches to the top of the seed.

[From: Environmental Weeds of Australia]