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.

Arthrostylidium grandifolium

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms scandent; 12 mm diam.; woody. Culm-internodes terete; with small lumen; 50 cm long; smooth; distally glabrous. Lateral branches dendroid. Bud complement 1. Branch complement several; in a clump; subtended by a bare patch above the node; with 1 branch dominant; thinner than stem. Leaves 7 per branch. Leaf-sheaths 7–8 cm long; mostly shorter than adjacent culm internode; striately veined; papillose; glabrous on surface. Leaf-sheath oral hairs lacking. Leaf-sheath auricles erect; 5 mm long. Ligule a ciliolate membrane; 6–10 mm long; brown. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath; petiole 1 cm long; petiole glabrous. Leaf-blades ovate; 20–26 cm long; 50–70 mm wide. Leaf-blade surface papillose; rough adaxially; glabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; straight, or arcuate; bilateral; 25–40 cm long; bearing 15–25 fertile spikelets on each. Rhachis glabrous on surface. Spikelet packing broadside to rhachis.

Spikelets appressed; solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 4–5 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 17–23 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1–1.5 mm long.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 5.5–7 mm long; chartaceous; 1-keeled; keeled above; 3 -veined. Lower glume lateral veins without connecting veins, or with cross-veins. Lower glume apex acuminate. Upper glume lanceolate; 7–8.5 mm long; 1-keeled; keeled above; 5 -veined. Upper glume lateral veins without cross-veins, or with cross-veins. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 10–11.5 mm long; chartaceous; without keel; 7–9 -veined. Lemma lateral veins without cross-veins, or with cross-veins. Lemma apex acute.

FLOWER Lodicules 3. Anthers 3. Stigmas 2.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: Brazil.

NOTES Bambuseae. Jud. & Clarke 2001.

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