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.

Bromus sundaicus

HABIT Perennial; caespitose. Basal innovations extravaginal. Culms erect, or geniculately ascending; 35–70 cm long; 3 -noded. Culm-nodes glabrous, or pubescent. Lateral branches lacking. Leaf-sheaths puberulous, or pubescent; with tubercle-based hairs. Ligule an eciliate membrane; 2.25–3.5 mm long. Leaf-blades 19–25.5 cm long; 2–6 mm wide; flaccid. Leaf-blade surface scabrous; rough on both sides; pubescent; hairy adaxially, or on both sides.

INFLORESCENCE Inflorescence a panicle. Peduncle pubescent above.

Panicle open; nodding; 18–22 cm long; 2.5–4 cm wide. Primary panicle branches 2 -nate; 7–14 cm long; bearing 1–2(–4) fertile spikelets on each lower branch. Panicle axis scabrous. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 6–7 fertile florets; with diminished florets at the apex. Spikelets laterally compressed; 17–30 mm long; 4 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1.7–3.3 mm long; pubescent. Floret callus pilose; disarticulating obliquely; with circular scar.

GLUMES Glumes persistent; shorter than spikelet. Lower glume lanceolate; 7.5–9 mm long; 0.75 length of upper glume; membranous; 1-keeled; 3–5 -veined. Lower glume primary vein scaberulous. Lower glume apex acute. Upper glume lanceolate; 12.5–13 mm long; 0.75 length of adjacent fertile lemma; membranous; 1-keeled; 5(–7) -veined. Upper glume primary vein scaberulous. Upper glume apex acute; muticous, or mucronate.

FLORETS Fertile lemma lanceolate; 12–13 mm long; chartaceous; without keel; (3–)5–7 -veined. Lemma surface scaberulous; rough on veins. Lemma margins pubescent. Lemma apex awned; 1 -awned. Principal lemma awn subapical; 5–10 mm long overall. Palea 8–11 mm long; 0.66–0.85 length of lemma. Palea keels scabrous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 3–4 mm long; yellow, or orange. Ovary with a fleshy appendage above style insertion; pubescent on apex.

FRUIT Caryopsis with adherent pericarp; 8.5–9 mm long; hairy at apex; apex fleshy. Hilum linear.

DISTRIBUTION Asia-tropical: Malesia.

NOTES Bromeae. Veldkamp 1994.

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