Dimeria R.Br.

Genus

Angiosperms > Poales > Poaceae

Characteristics

Annual or perennial. Culms often delicate, erect to decumbent, nodes bearded, the hairs directed upward. Leaf blades linear; ligule short, membranous. Inflorescence terminal, composed of solitary or subdigitate racemes. Racemes 1-sided, spikelets single, shortly pedicelled, usually overlapping in 2 rows; rachis tough, triquetrous or flattened, spikelets disarticulating from pedicels at maturity; pedicels very short, broad, apex concave, margin truncate. Spikelets lanceolate or narrowly oblong, strongly laterally compressed; callus truncate, shortly bearded; glumes herbaceous or thinly papery, folded with a median keel, keel often winged, lower glume narrower and slightly shorter than upper glume; lower floret reduced to a narrow hyaline lemma; upper floret bisexual, lemma hyaline, a little shorter than upper glume, apex shortly 2-toothed, awned from sinus; awn geniculate, sometimes weakly or almost straight, glabrous; upper palea normally absent. Stamens 2. Caryopsis narrowly oblong, laterally compressed.
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Compactly or loosely tufted annuals or perennials, with simple or branched culms, sometimes geniculate at lower nodes, hollow. Leaves: ligule a short, unfringed, lacerate, ciliate or fimbriate membrane; blade linear to narrowly lanceolate. Inflorescences terminal, digitate or subdigitate, espatheate; racemes solitary or paired, spike-like. Spikelets numerous, solitary, alternately arranged along one side of rachis, on short pedicels, laterally compressed. Glumes similar, laterally compressed, conduplicate, keeled along midvein; lower glume 1-keeled; upper glume (in Australia) lanceolate-acute, membranous on each side of midvein. Lower floret reduced to a membranous lemma, sterile. Upper floret with lemma bidentate or 2-lobed, with a geniculate glabrous awn or awnless (not in Australia); palea absent; bisexual. Caryopsis linear, laterally compressed.
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Growth form herb
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Sexuality hermaphrodite
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Hardiness (USDA) 8-12

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