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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Aristida jerichoensis
HABIT Perennial; caespitose; clumped densely. Culms 30–60 cm long. Culm-internodes smooth; distally glabrous. Lateral branches sparse. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs ciliate. Ligule a fringe of hairs; 0.5–1 mm long. Collar glabrous, or pubescent. Leaf-blades flexuous; involute; 16–18 cm long; 2 mm wide. Leaf-blade surface scabrous; rough adaxially.
INFLORESCENCE Inflorescence a panicle.
Panicle contracted; linear, or lanceolate; 4–15 cm long; 1–2 cm wide. Primary panicle branches 1–3.5 cm long; bearing spikelets almost to the base.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 5–9 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 1 mm long; pubescent; acute.
GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 5–9 mm long; 1 length of upper glume; membranous; 1-keeled; 1–3 -veined. Lower glume lateral veins absent, or distinct. Lower glume surface smooth to scabrous. Lower glume apex acute, or acuminate; muticous, or mucronate. Upper glume lanceolate; 5–9 mm long; 1.2–1.3 length of adjacent fertile lemma; membranous; 1-keeled; 1–3 -veined. Upper glume lateral veins absent, or distinct. Upper glume surface smooth to scabrous. Upper glume apex emarginate, or obtuse; muticous, or mucronate.
FLORETS Fertile lemma lanceolate; subterete; 4–7 mm long; coriaceous; pallid, or light brown, or purple; without keel; 3 -veined. Lemma margins involute; covering most of palea; without distinctive roughness, or scabrous. Lemma apex acute; awned; 3 -awned. Principal lemma awn flat below; with 12–24 mm long limb; without a column; persistent. Lateral lemma awns 10–21 mm long; subequal to principal. Palea 0.2 length of lemma; without keels.
FLOWER Anthers 3.
FRUIT Caryopsis with adherent pericarp; sulcate on hilar side; 3.5–4.5 mm long. Hilum linear.
DISTRIBUTION Australasia: Australia.
NOTES Aristideae. Simon 1993.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
