Greek, platy-, broad, and rhachis, leaf axis above the petiole, from the strongly flattened rachis.
Bailey originally used the spelling "platyrhachis", later amending this to
"platyrachis". Both spellings are legitimate, and Johnson (1959) recommended
that the later spelling of "platyrachis" be used.
Distinguished by the short, spirally twisted leaves with short, broad petioles and very broad leaflets.
Distribution and habitat:
Central Queensland, the Blackdown Tableland and Expedition Range area. Scattered and locally abundant in dry sclerophyll forest on flat plateau country on sandstone.
Not considered to be at risk, well conserved in Blackdown Tableland National Park (IUCN Red List category LR,lc; ROTAP category 2Rcat). Gazetted as a Rare or Threatened Plant under Queensland Nature Conservation legislation.
1997 IUCN Red List of Threatened Plants category E.
|Photo Ken Hill
Plants acaulescent, stem 25-60 cm diam.
Leaves 2-8 in crown, bright green, highly glossy to semiglossy, 45-80
cm long, moderately keeled, with 36-60 leaflets; rachis not
spirally twisted, straight, stiff or recurved,
arching stiffly downwards; petiole 15-25 cm long, straight or recurved, unarmed,
13-18 mm wide at lowest leaflets; basal leaflets not reducing to spines.
Leaflets simple, strongly discolorous; margins flat; apex dentate,
not spinescent; median leaflets 250-400 mm long, 12-20 mm wide.
Pollen cones narrowly ovoid, 15-20 cm long, 4-4.5 cm diam.;
microsporophyll lamina 18-21 mm long, 16-19 mm wide; apical spine 0-8 mm long.
Seed cones ovoid, 12-17 cm long, 8-9 cm diam.; megasporophyll with an
expanded peltate apex 40-50 mm wide, 20-30 mm high; apical spine 1-13 mm long.
Seeds ovoid, 25-30 mm long, 20-25 mm wide; sarcotesta red.