GrassBase - The Online World Grass Flora


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

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

Thysanolaena latifolia

HABIT Perennial; caespitose. Culms 200–400 cm long. Culm-internodes solid. Ligule an eciliate membrane; 1–2 mm long. Leaf-blades deciduous at the ligule; 30–60 cm long; 30–70 mm wide; stiff. Leaf-blade venation with distinct cross veins. Leaf-blade margins cartilaginous; scaberulous.

INFLORESCENCE Inflorescence a panicle; bearing juvenile spikelets at emergence.

Panicle open; oblong, or ovate; 30–60 cm long; 15–30 cm wide; contracted about primary branches. Primary panicle branches appressed, or spreading. Panicle branches stiff; bearded in axils.

Spikelets solitary, or in pairs. Fertile spikelets pedicelled; 1–2 in the cluster. Pedicels filiform; 0.5–1 mm long; scaberulous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 1.5–2 mm long; falling entire; deciduous with the pedicel; readily shedding fertile florets; pedicel base truncate.

GLUMES Glumes similar; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 0.65 mm long; 1 length of upper glume; membranous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume ovate; 0.7 mm long; 0.5 length of adjacent fertile lemma; membranous; without keels; 1 -veined. Upper glume apex acute.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to fertile lemma; lanceolate; 1.8 mm long; 1 length of spikelet; membranous; 1–3 -veined; eciliate on margins, or ciliate on margins; acute. Fertile lemma lanceolate; 1.4 mm long; membranous; much thinner on margins; without keel; 3 -veined. Lemma margins ciliate. Lemma apex acute. Palea 0.5 length of lemma. Rhachilla extension 0.1 length of fertile floret.

FLOWER Lodicules 2. Anthers 2; 0.6–1 mm long. Stigmas 2. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; 0.5–0.6 mm long. Hilum punctiform.

DISTRIBUTION Africa: west tropical, east tropical, and western Indian ocean. Asia-temperate: China and eastern Asia. Asia-tropical: India, Indo-China, Malesia, and Papuasia. Pacific: north-central.

NOTES Arundineae. FTA.

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