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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Panicum sparsicomum

HABIT Annual, or perennial; short-lived. Culms rambling; 50–150 cm long (long); rooting from lower nodes. Culm-internodes distally pubescent. Culm-nodes pubescent. Lateral branches ample. Leaf-sheaths without keel; pubescent; outer margin hairy. Leaf-sheath oral hairs ciliate. Ligule a ciliate membrane; 0.2–0.4 mm long. Collar pubescent. Leaf-blade base broadly rounded, or cordate; asymmetrical. Leaf-blades lanceolate; 2.5–9 cm long; 5–11 mm wide. Leaf-blade surface puberulous to hirsute. Leaf-blade margins scaberulous; ciliate; hairy at base.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 5–17 cm long. Primary panicle branches spreading. Panicle branches smooth, or scabrous; pubescent in axils.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; compressed slightly; gibbous; acute; 1.5–1.9 mm long; falling entire. Rhachilla internodes elongated between glumes.

GLUMES Glumes shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 0.7–0.9 mm long; 0.5 length of spikelet; membranous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume ovate; 1.2–1.5 mm long; 0.66–0.75 length of spikelet; membranous; without keels; 5 -veined. Upper glume lateral veins prominent. Upper glume apex acute.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret similar to upper glume; ovate; 1 length of spikelet; membranous; 5 -veined; prominently veined; acute. Palea of lower sterile floret 0.5 length of lemma. Fertile lemma elliptic; dorsally compressed; 1.3–1.6 mm long; indurate; yellow, or light green; shiny; without keel. Lemma surface punctate. Lemma margins involute. Lemma apex acute. Palea involute; indurate.

FLOWER Anthers 3; 0.7–0.9 mm long.

FRUIT Caryopsis with adherent pericarp; ellipsoid; 0.9 mm long.

DISTRIBUTION Asia-tropical: India.

NOTES Paniceae. Fl Ceyl 1993.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.