Rytidosperma geniculatum (J.M.Black) Connor & Edgar

Species

Angiosperms > Poales > Poaceae > Rytidosperma

Characteristics

Small, compact, stiff tussocks; leaves semi-pungent, usually < culms; branching intravaginal, occasionally ± swollen at base. Leaf-sheath pale stramineous, usually a few scattered long stiff hairs; apical tuft of hairs to 2 mm. Ligule to 0.5 mm. Leaf-blade to 12 cm, tightly inrolled, rather scattered long stiff hairs, margins scabrid. Culm to 25 cm, internodes smooth, or minutely scabrid below inflorescence. Panicle short and broad, to 2.5 cm, of few broad spikelets on short pedicels; rachis and pedicels with rather dense short hairs. Spikelets 3-flowered, awns included by glumes. Glumes purplish, ovate-lanceolate, broad at base, abruptly narrowed towards subobtuse tip, 6.5-9 mm, ± equal; lower 9-nerved, upper 7-9-nerved. Lemma 2-3 mm, 7-9-nerved, upper row of hairs continuous, very dense, usually = lemma lobes, lower row usually indistinct, elsewhere abundant short scattered hairs, adaxially a triangular band of scattered hairs below sinus; lobes 3-3.5 mm, tapering to very short awn, occasionally lobes with a shallow subsidiary lobe; central awn 3.5-5 mm, column 1-1.5 mm < upper lemma hairs. Palea 3-3.5 mm, « upper lemma hairs, interkeel hairs few short scattered below, margins with 1-2 long hairs. Callus 0.5-1.0 mm, marginal hair tufts long, abundant, much overlapping lower hairs. Rachilla 0.1-0.2 mm. Anthers 0.7-1 mm. Caryopsis 1.5-1.7 × 0.7-0.9 mm; embryo 0.6-0.9 mm; hilum to 0.5 mm.
More
Plants caespitose; innovation buds intravaginal. Culms 8–30 cm high. Inflorescences obliquely ovate. Spikelets 6.7–10 mm long, with 4–6 florets. Glumes slightly exceeding florets, pale green; lower glume 5.5–9 mm long, 2.3–4 mm wide. Lemma: body 1.5–2.4 mm long, villous between the rows of tufts; both rows of hair tufts complete, with lower row exceeding upper row; lobes longer than body, up to more than twice as long; setae 0.8–2 mm long, shorter than lobes; awn 4.5–7.2 mm long, equalling setae; awn column with from 1 or 2 twists to tightly twisted, shorter than lobes. Palea obovate, 2.1–3 mm long, broad, 1–3 times as long as wide, slightly exceeding lemma sinus. Anthers 0.3–0.6 mm long. Caryopsis 1.2–1.4 mm long.
Life form perennial
Growth form herb
Growth support free-standing
Foliage retention -
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 0.08 - 0.3
Root system -
Rooting depth (meter) -
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Flower color -
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Nitrogen fixer -
Photosynthetic pathway -

Environment

Widespread on sandy soils,associated with open woodland, sunny grassland or heathland.  
Light -
Soil humidity -
Soil texture -
Soil acidity -
Soil nutriment -
Hardiness (USDA) 7-11

Usage

Uses -
Edible -
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Mode -
Germination duration (days) -
Germination temperacture (C°) -
Germination luminosity -
Germination treatment -
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Optimum temperature (C°) -
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Productivity -

Distribution

Rytidosperma geniculatum world distribution map, present in Australia and New Zealand

Identifiers

LSID urn:lsid:ipni.org:names:419804-1
WFO ID wfo-0000896450
COL ID 6WYYL
BDTFX ID -
INPN ID -
Wikipedia (EN)
Wikipedia (FR)

Synonyms

Danthonia geniculata Notodanthonia geniculata Austrodanthonia geniculata Rytidosperma geniculatum