Amphibromus sinuatus S.W.L.Jacobs & Lapinpuro, Telopea 2: 727 (1986).

T: Northern end of Llangothlin Lagoon, c. 4.5 km E of highway, 30 02'S 151 46'E, N.S.W., 26 Nov. 1982, Lapinpuro 17, Jacobs & Wilson (NSW)

Illustrated in: Fl. N.S.W. 4: 596 (1993) (spikelet and floret).

Vegetative form. Perennial, decumbent and ascending, stoloniferous (rooting at lower nodes). Basal culm internodes swollen, or not swollen. Culms to 70 cm high, 1-4 noded. Mid-culm nodes glabrous, exposed, constricted. Mid-culm internodes hollow, glabrous, terete to compressed. Leaves non-auriculate. Basal leaf sheaths not keeled, terete, glabrous or scabrous (sparsely), with the veins equally striate. Ligule 5-11 mm long, membranous, acuminate to acute, entire (becoming lacerated with age). Leaf blades flat or involute, linear, to 170 mm long, 1-4 mm wide; adaxially scabrous (on the veins), channelled; abaxially scabrous, with the veins equally striate.

Reproductive organization. Plants bisexual. Incomplete spikelets absent. Inflorescence of cleistogamous spikelets, or chasmogamous spikelets (with cleistogamous or chasmogamous florets).

Inflorescence. Inflorescence a panicle, erect, symmetrical, partially exserted. Rachides to 210 mm long, terete (becoming angled toward apex), glabrous (becoming scabrous toward apex). Primary inflorescence branches scabrous (to 11 cm long); paired or clustered, spreading or appressed. Spikelets erect, spreading.

Hermaphrodite (`perfect') spikelets. Hermaphrodite spikelets pedicellate, 9-21 mm long, laterally compressed, not disarticulating as a separate unit, disarticulating above the glumes. Pedicels to 20 mm long, scabrous. Glumes two per spikelet (pale with darker veins), dissimilar, unequal in length, shorter than the florets, approximately half the proximal lemma in length (?). Lower glume c. 2/3s the length of the upper glume (?), narrowly ovate to triangular, (3-)3.7-4.5 mm long, 1-1.2 mm wide, weakly keeled, acuminate to acute, muticous; 1-3 veined, midvein glabrous; intercostal regions glabrous. Upper glume narrowly ovate to ovate, (3.5-)4.3-6 mm long, (1.2-)1.7-2.4 mm wide, weakly keeled, acute, muticous; 3-5 veined, midvein glabrous; intercostal regions glabrous. Rudimentary florets distal to the hermaphrodite florets. Incomplete florets absent. Hermaphrodite florets 4-6 per spikelet (cleistogamous or chasmogamous florets). Rachilla disarticulating between the florets, disarticulating directly below the florets, segments bearded at apex, apically prolonged; terminated by a rudimentary floret. Callus present, blunt, hirsute (?). Lemma laterally compressed, (4.5-)6.2-8.2 mm long, not keeled, bifid or dentate (?, the outer teeth smaller and lower, the inner teeth 0.5-1 mm long), 2 -lobed (?), awned. Lemma 7 veined. Lemma veins not confluent apically, scabrous, with the hairs on all the veins; intercostal regions scabrous. Awns 1, median. Median awn much longer than the body of the lemmas, 14-26 mm long, 1 veined, dorsal, arising from the upper half of the lemma or from the mid-point of the lemma (from about 1/3 the lemma length from the tip), straight or curved, column twisted or column not twisted, scabrous (pale). Palea fully developed, slightly shorter than the lemmas, 2-keeled, keels wingless, acute; 2 veined, veins ciliate; intercostal regions glabrous. Lodicules 2, free, hyaline, acute, glabrous. Stamens 3. Anthers 2.3-3.3 mm long. Cleistogamous anthers 0.5-0.7 mm long.

Fruit. Fruit free from both lemma and palea, oblong, dorsiventrally compressed (dorsally), 2.3-2.7 mm long, glabrous (yellow-brown). Hilum 30-40% the fruit length, linear (dark yellow-brown to red-brown). Embryo 25-35% the fruit length.

Distribution. Endemic. Tasmania, New South Wales, and Victoria.

Ecology. Hydrophytic; in open habitats. Eastern New South Wales, Victoria and Tasmania in cold areas with permanent swamps. Flowers spring-summer.

Vouchers. Specimens examined morphologically: Tas.: Snake Banks near Powranna, in wet mud in water-hole, alongside Midlands Hwy, 28 Nov. 1982, A.M.Buchanan 987 (HO).

Classification. Pooideae; Poodae; Aveneae.

References. Morphology: Jacobs & Lapinpuro 2: 728 (1986); Morris 59 (1991).

Cite this publication as:
C.M. Weiller, M.J. Henwood, J. Lenz and L. Watson (1995 onwards). `Pooideae (Poaceae) in Australia - Descriptions and Illustrations'. URL http://muse.bio.cornell.edu/delta/
Dallwitz (1980) and Dallwitz, Paine and Zurcher (1993) should also be cited.

References and Acknowledgements