Australian Tropical Rainforest Plants - Online edition

Geosiris australiensis B.Gray & Y.W.Low

Herb (herbaceous or woody, under 1 m tall)
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Habit and flower. © B. Gray
Flower showing stamens. © B. Gray
Top view of stigma showing truncate apex. © B. Gray
Flower bud with bracts. © B. Gray
Habit with underground rhizome; stigma with truncate apex; side view of unopened flower; cross-section of unopened flower. Illustration from Candollea 72 (2017)

Gray, B. & Low, Y.W. (2017) Candollea 72(2): 251. Type: "Australia. Queensland : N Queensland, Cook District, Little Cooper Creek, Daintree National Park, 15.I.2017, Gray, Hawkes & de Groot BG 9763 (holo- : BRI! ; iso- : CNS!)".


Plant perennial, achlorophyllous, mycoheterotrophe, 50-120 mm high, with slender, simple or rarely branched, purplish, stems arising from an underground rhizome c. 20-60 mm long with several tuber like thickened sections. Roots filiform arising from rhizome tubers.


Leaves scale-like, 3-4.5 mm long, clasping the stem, pale creamy mauve.


Inflorescence a headlike (possibly a contracted rhipidium) with 1-3 subsessile flowers opening sequentially ; floral bracts membranous, maroon. Flowers erect, actinomorphic and opening widely, c. 15-16 mm diameter, very pale mauve to white, bright orange in the throat of the perianth tube. Perianth tube 2.1-2.3 mm long. Tepals lanceolateelliptic to narrowly obovate, 6-7 × 3.5-4 mm, spreading. Stamens 3, filaments included in perianth tube, filiform, free, c. 1.8 mm long. Anthers c. 1.5 mm long, basifixed, coherent and clasping style. Ovary ovoid c. 2.1-2.2 mm long. Style erect, 4.7-4.8 mm long, fusiform above the anthers and triangular in cross section but becoming only slightly triangular at the apex and finely fringed.


Capsules not seen.


Features not available.

Distribution and Ecology

Endemic to NEQ, where it is only known from Daintree National Park. Altitudinal range from 175-1254 m. Occurs in rainforest.

RFK Code


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