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Descriptions

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

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

Arundo

HABIT Perennial. Rhizomes short (1), or elongated (4). Culms erect (4), or decumbent (1); reed-like; 50–290–600 cm long. Lateral branches lacking (1/2), or ample (1/2). Ligule a ciliolate membrane. Leaf-blades linear (4), or lanceolate (1).

INFLORESCENCE Inflorescence a panicle.

Panicle open (1), or contracted.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1–2 fertile florets (3), or 3–5 fertile florets (2); with a barren rhachilla extension. Spikelets lanceolate (2), or elliptic (1), or cuneate (3); laterally compressed; 6–10.3–15 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite. Floret callus evident; pilose (2), or bearded (3).

GLUMES Glumes persistent; shorter than spikelet (2), or reaching apex of florets (3). Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 3 -veined, or 4–5 -veined (3). Lower glume surface without pits; glabrous (4), or pilose (1). Lower glume apex acute (3), or acuminate (2). Upper glume lanceolate; 1–1.15–1.25 length of adjacent fertile lemma; membranous; 1-keeled; 3–5 -veined. Upper glume surface glabrous (4), or pilose (1). Upper glume apex acute (3), or acuminate (2).

FLORETS Fertile lemma lanceolate; membranous; without keel; wingless; 5 -veined, or 6–7 -veined (4), or 8–9 -veined (3). Lemma surface unwrinkled; without grooves; glabrous (1), or villous (4). Lemma apex entire (3), or dentate (2); 2 -fid (2/2); acute (3/3), or acuminate (3/3); muticous (3), or mucronate (3), or awned (2); 1 -awned (2/2). Principal lemma awn apical (3), or from a sinus (2). Palea 0.5–0.62–0.8 length of lemma; 2 -veined. Palea keels eciliate (2), or ciliolate (3).

FLOWER Lodicules 2. Anthers 3. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; ovoid (3/3). Embryo 1 length of caryopsis. Hilum punctiform (3/3).

DISTRIBUTION Europe (4), or Africa (2), or Temperate Asia (3), or Tropical Asia (2), or Australasia (1), or Pacific (1), or North America (1), or South America (1).

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