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Descriptions

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

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

Arthrostylidium longiflorum

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms 300–400 cm long; 20 mm diam.; woody. Culm-internodes terete; hollow; 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. Culm-sheaths 15 cm long. Culm-sheath blade lanceolate; erect; 30 cm long; acuminate. Leaves 5–7 per branch. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs setose; flat; spreading; 8–12 mm long; dark. Ligule a ciliolate membrane; 0.3 mm long; pubescent on abaxial surface. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.3–0.5 cm long; petiole glabrous. Leaf-blades ovate; 18–23 cm long; 35–50 mm wide. Leaf-blade surface glabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; flexuous; bilateral; 10–15 cm long; bearing 6–12 fertile spikelets on each. Rhachis semiterete; glabrous on surface. Spikelet packing broadside to rhachis.

Spikelets ascending; solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 10–14 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 40–50 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes obscured by lemmas.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume ovate; 4–6 mm long; 0.7–0.8 length of upper glume; chartaceous; without keels; 3 -veined. Lower glume apex acute. Upper glume ovate; 5–8 mm long; 0.5 length of adjacent fertile lemma; without keels; 5–7 -veined. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 13–16 mm long; chartaceous; without keel; 1–3 -veined. Lemma lateral veins obscure. Lemma apex acuminate. Palea 11–13 mm long. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3. Anthers 3; 3–4 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: northern South America.

NOTES Bambuseae. Jud. & Clarke 2001.

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