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Descriptions

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

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

Bromus morrisonensis

HABIT Perennial; short-lived; caespitose. Basal innovations extravaginal. Culms erect, or geniculately ascending; 50–70 cm long. Culm-nodes glabrous. Lateral branches lacking. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 0.5 mm long; truncate. Leaf-blades 21–23 cm long; 3–3.5 mm wide; flaccid. Leaf-blade surface scabrous; rough adaxially; glabrous.

INFLORESCENCE Inflorescence a panicle. Peduncle glabrous.

Panicle open; nodding; 13–16 cm long; 2.5–3 cm wide. Primary panicle branches 3 -nate; 7 cm long; bearing 3 fertile spikelets on each lower branch. Panicle axis scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 5–7 fertile florets; with diminished florets at the apex. Spikelets laterally compressed; 18–23 mm long; 5–8 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2–2.5 mm long; pubescent. Floret callus pilose; hairy in a ring above; disarticulating obliquely; with circular scar.

GLUMES Glumes persistent; shorter than spikelet. Lower glume linear, or lanceolate; 4.5–5.5 mm long; 0.75–0.85 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein smooth. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume elliptic; 5.75–6.5 mm long; 0.66 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein smooth. Upper glume apex acuminate; mucronate.

FLORETS Fertile lemma lanceolate; 9–10 mm long; chartaceous; without keel; 3(–5) -veined. Lemma surface puberulous; hairy below. Lemma apex awned; 1 -awned. Principal lemma awn subapical; 4.5–5 mm long overall. Palea 6.5 mm long; 0.66–0.8 length of lemma. Palea keels scaberulous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 1.5–2 mm long; yellow, or orange. Ovary with a fleshy appendage above style insertion; pubescent on apex.

FRUIT Caryopsis with adherent pericarp; hairy at apex; apex fleshy. Hilum linear.

DISTRIBUTION Asia-temperate: eastern Asia. Asia-tropical: Malesia.

NOTES Bromeae. Veldkamp 1994.

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