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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 youngianum

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms scandent; pendulous at the tip; 1200 cm long; 5–15 mm diam.; woody. Culm-internodes terete; smooth; distally glabrous. Culm-nodes swollen (corky). 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 tardily deciduous; 11–26 cm long; asymmetrical at apex; ciliate on shoulders. Culm-sheath blade lanceolate; 6–12 cm long; 10–20 mm wide. Leaves 3–5 per branch. Leaf-sheaths glabrous on surface; outer margin hairy. Leaf-sheath oral hairs setose; 3–5 mm long; dark. Ligule a ciliolate membrane; 0.1–0.2 mm long. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.2–0.4 cm long. Leaf-blades lanceolate; 9–15 cm long; 13–28 mm wide. Leaf-blade surface glabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; straight; bilateral; 4–10 cm long; bearing few fertile spikelets; bearing 4–8 fertile spikelets on each. Rhachis 1 mm wide; glabrous on surface. Spikelet packing broadside to rhachis; lax.

Spikelets appressed; solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 3–6 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 13–28 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2–3 mm long.

GLUMES Glumes several; 3 empty glumes; persistent; similar; shorter than spikelet. Lower glume lanceolate; 3.3–6.5 mm long; chartaceous; without keels; 3–5 -veined. Lower glume apex acute. Upper glume lanceolate; 4–8.5 mm long; without keels; 3–7 -veined. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 7.5–10.5 mm long; chartaceous; without keel; 7–9 -veined. Lemma apex acute. Palea surface puberulous; hairy on back. Apical sterile florets resembling fertile though underdeveloped.

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

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: western South America.

NOTES Bambuseae. Jud. & Clarke 2001.

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