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 fimbrinodum

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms scandent; pendulous at the tip; 700 cm long; 4–12 mm diam.; woody. Culm-internodes terete; with small lumen; smooth, or scaberulous. Culm-nodes bearded. Lateral branches dendroid; extravaginal. Bud complement 1. Branch complement several; in a clump; subtended by a bare patch above the node; with 1 branch dominant; thinner than stem. Culm-sheaths 9–13 cm long; setose on shoulders; shoulders with 10 mm long hairs. Culm-sheath blade linear; deciduous; erect; 6–7 cm long. Leaves 9–21 per branch. Leaf-sheaths keeled; glabrous on surface, or puberulous; outer margin hairy. Leaf-sheath oral hairs setose; 3–6 mm long; dark. Ligule a ciliolate membrane; 0.2–0.3 mm long. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.07–0.1 cm long. Leaf-blades lanceolate; 2.5–11 cm long; 3–18 mm wide. Leaf-blade midrib indistinct. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; straight; bilateral; 2.5–3.5 cm long; bearing few fertile spikelets; bearing 2–5 fertile spikelets on each. Rhachis glabrous on surface. Spikelet packing broadside to rhachis; lax.

Spikelets appressed; solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 2–4 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 8–13 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2–3 mm long.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 3–3.3 mm long; chartaceous; without keels; 1–3 -veined. Lower glume lateral veins absent, or distinct. Lower glume apex acuminate. Upper glume lanceolate; 4.2–4.8 mm long; 1-keeled; keeled above; 5–7 -veined. Upper glume apex acuminate; mucronate.

FLORETS Fertile lemma lanceolate; 5.3–6.5 mm long; chartaceous; without keel; 7 -veined. Lemma apex acute; mucronate. Palea 1 length of lemma. Palea surface puberulous; hairy on back. Apical sterile florets 1 in number; rudimentary.

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.