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Descriptions

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

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

Miscanthus tinctorius

HABIT Perennial; caespitose. Rhizomes short. Culms erect; 60–150 cm long; 2–4 mm diam.; 5–8 -noded. Culm-nodes pubescent. Leaves cauline. Leaf-sheaths glabrous on surface, or pilose; outer margin hairy. Leaf-sheath oral hairs bearded. Ligule a ciliolate membrane; 2–3 mm long. Leaf-blades 15–40 cm long; 8–14 mm wide. Leaf-blade surface glabrous, or pubescent; sparsely hairy; hairy adaxially.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 2–12; digitate; 10–15 cm long. Central inflorescence axis 1.5–3 cm long. Rhachis tough; angular; glabrous on surface; scaberulous on margins. Rhachis internodes filiform; 4–7 mm long.

Spikelets in pairs. Fertile spikelets pedicelled; 2 in the cluster. Pedicels filiform; unequal; 0.5–4 mm long.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 4–6 mm long; falling entire. Spikelet callus bearded; base truncate. Spikelet callus hairs white; 0.4–0.5 length of spikelet.

GLUMES Glumes similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of spikelet; chartaceous; without keels; 3 -veined. Lower glume surface flat; pilose. Lower glume apex dentate; 2 -fid. Upper glume lanceolate; chartaceous; without keels; 3 -veined. Upper glume surface pilose. Upper glume margins ciliolate. Upper glume apex acute.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret lanceolate; 0.9 length of spikelet; hyaline; 0 -veined; without midvein; without lateral veins; ciliolate on margins; acute. Fertile lemma lanceolate; 3–4.5 mm long; hyaline; without keel; 1 -veined. Lemma margins ciliate; hairy above. Lemma apex entire; acuminate; muticous, or mucronate, or awned; 1 -awned. Principal lemma awn 0–1 mm long overall; not or scarcely exserted from spikelet. Palea linear; 0.2–0.5 length of lemma; 0 -veined. Palea surface pubescent; hairy on flanks. Palea apex acuminate.

FLOWER Anthers 3.

DISTRIBUTION Asia-temperate: eastern Asia.

NOTES Andropogoneae. Koyama.

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