Gahnia aspera —Rough Saw-sedge—CYPERACEAE

Gahnia aspera

Link to Images on Flickr.

Habitat—Grows in drier situations in rainforest, dry sclerophyll forest and woodland.

Distribution—Widespread, from the far south coast extending inland to Pilliga and Rankin Springs areas in New South Wales. Also in Queensland, Malaysia and Polynesia.

Description—Tufted perennial. Culms 15 to 65 cm high, 2 to 4 mm diam.

Local occurrences

Australis Resort, Barrington/Gloucester Tops, Bennett Head, Black Head, Black Head Beach, Black Head Flora Park, Booti Hill, Burgess Beach, Burgess Road, Cape Hawke, Cellito, Charlotte Head, Cliff Road, Copeland, Crowdy Bay National Park, Darawank Nature Reserve and Wetland, Diamond Beach, Diamond Beach LRF, Dixon Property, Elizabeth Beach, Golden Ponds Reserve, Great Lakes College-Tuncurry Campus, Karloo Street Reserve, Knappinghat Nature Reserve, One Mile Beach, Pebbly Beach, Red Head, Reservoir Hill Reserve, Saltwater Nature Reserve, Sea Acres National Park, Second Head, Seven Mile Beach and Green Point, Stephen Street Reserve, Talawahl Nature Reserve, The Sanctuary, Tiona, Tuncurry Dunes and Heath, Waitui Falls, Wallamba River Area, Wallingat National Park and Zamia Place Reserve

Leaves.—Leaves erect to spreading, scabrous at least near apex, longer than inflorescence, ± flat; ligule narrow, papery; sheaths dark brown, pinkish above, shining or dull.

Gahnia aspera
Gahnia aspera

Inflorescence— Inflorescence erect, narrow, with spikelets in discrete, dense, globose clusters, 10 to 35 cm long, with 5 to 10 nodes. Spikelets 1–flowered. Glumes 6 to 8, 3 uppermost glumes much shorter, red–brown to dark brown, scaberulous to glabrous, lower glumes with aristate or acuminate apex, upper obtuse. Stamens 4 to 6; anthers 0.8 to 1.3 mm long (including apical appendage 0.1 to 0.2 mm long). Style 3–fid.


Fruit—Nut globose to broad-ovoid, ± terete, 4 to 6 mm long, 2 to 4 mm diam., isodiametrically reticulate, shining, dark red—brown.

Ripe.—November to February.

Gahnia aspera