Type

"Holotypus: <i>W.R. Barker 7838 & K. Brennan</i>, 5 Apr. 1999, on south face of Nourlangie Rock, c. 200 m N and above Anbangbang rock art site, Northern Territory (AD 279073). Isotypi: BRI, CANB, CNS, DNA, PERTH."

Etymology

"An adjectival epithet from the Greek <i>petra</i>, rock, shelf or ledge or rock; <i>petrensis</i>, among rocks, alluding to the habitat on flattish ground in skeletal soil on or between rocks."

Type

"Holotypus: <i>W.R. Barker 7838 & K. Brennan</i>, 5 Apr. 1999, on south face of Nourlangie Rock, c. 200 m N and above Anbangbang rock art site, Northern Territory (AD 279073). Isotypi: BRI, CANB, CNS, DNA, PERTH."