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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 complanatum

HABIT Perennial; caespitose. Culms 35–60 cm long. Culm-internodes terete; hollow; distally pilose. Culm-nodes pubescent. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths retrorsely scabrous; hirsute. Ligule a ciliate membrane; 0.2–1 mm long. Collar pilose. Leaf-blades flat, or involute; 14–24 cm long; 2–4 mm wide. Leaf-blade surface pubescent.

INFLORESCENCE Inflorescence a panicle. Peduncle 25 cm long; hirsute above.

Panicle open; ovate; loose; 10–20 cm long; 5–12 cm wide. Primary panicle branches 4–5 in number; ascending. Panicle axis scaberulous; hirsute. Panicle branches pubescent in axils.

Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels clavate; 3–8 mm long; ciliate; hairy all along but hairs longer above.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 4.7–5.5 mm long; 1–1.5 mm wide; falling entire. Rhachilla internodes elongated between glumes.

GLUMES Glumes similar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 3–3.5 mm long; 0.5–0.6 length of spikelet; membranous; without keels; 5–7 -veined. Lower glume apex acute. Upper glume ovate; 4.3–4.7 mm long; 1 length of spikelet; membranous; without keels; 9 -veined. Upper glume surface scabrous; rough at apex. Upper glume apex acute.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret similar to upper glume; elliptic; 1 length of spikelet; membranous; 9 -veined; smooth, or scaberulous; rough at apex; acuminate. Palea of lower sterile floret hyaline; (1.3–)2.3–2.5 mm long. Fertile lemma elliptic; dorsally compressed; 3–5.1 mm long; 1–1.2 mm wide; indurate; pallid; without keel. Lemma surface smooth; with basal hair tufts near margin. Lemma margins involute. Palea involute; indurate. Palea surface papillose; pilose; hairy in a transverse fringe; hairy at base.

FLOWER Lodicules 2. Anthers 3; 1.9–2 mm long.

FRUIT Caryopsis ellipsoid; 2 mm long. Embryo 0.5 length of caryopsis. Hilum elliptic.

DISTRIBUTION South America: Brazil.

NOTES Paniceae. Gug. et al 2008.

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