1. Spikelets to 2.9 mm long; nerves of lower lemma with spicules; lower and upper florets subequal W. subxerophila (NSW QLD)

Panicum subxerophilum
Spikelets at least 3 mm long; nerves of lower lemma smooth; upper floret shorter than lower floret 2

2. Upper glumes glabrous and acuminate; leaf blades flat and without pungent tip W. proluta (NSW SA VIC QLD)

Panicum prolutum, Homopholis proluta
Upper glumes scabrous and acute; leaf blades involute and with pungent tip W. pungens (NSW)

Key to Walwhalleya derived from Wills et al. 2000

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith