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Descriptions

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

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

Loudetiopsis papilosa

HABIT Perennial. Culms erect; 100–200 cm long. Culm-internodes distally glabrous. Culm-nodes brown; glabrous. Lateral branches lacking. Leaf-sheaths outer margin hairy. Leaf-sheath oral hairs ciliate. Ligule a fringe of hairs; 0.3 mm long. Leaf-blades 40 cm long; 5 mm wide. Leaf-blade surface glabrous. Leaf-blade margins scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong; 15–20 cm long. Primary panicle branches ascending.

Spikelets in threes. Fertile spikelets pedicelled; 3 in the cluster. Pedicels filiform; subequal; 5–40 mm long.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; compressed slightly; 30–35 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident.

GLUMES Glumes persistent; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 0.5–0.6 length of upper glume; chartaceous; dark brown; without keels. Lower glume surface setose; hairy on veins; with tubercle-based hairs. Lower glume apex acuminate. Upper glume lanceolate; chartaceous; dark brown; without keels. Upper glume surface glabrous. Upper glume apex acuminate.

FLORETS Basal sterile florets male; with palea; separately deciduous. Lemma of lower sterile floret similar to upper glume; lanceolate; chartaceous; acuminate. Fertile lemma elliptic; 10–10.1 mm long; 1.5 mm wide; coriaceous; without keel. Lemma surface villous. Lemma margins involute; interlocking with palea keels. Lemma apex lobed; 2 -fid; with lobes 2–2.5 mm long; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 65 mm long overall; with twisted column; deciduous; abscissing from top of lemma. Column of lemma awn 14–34 mm long; hispidulous. Palea 2 -veined. Palea keels approximate; thickened.

FLOWER Anthers 2; 4–6 mm long.

FRUIT Caryopsis with adherent pericarp; glabrous.

DISTRIBUTION North America: Mexico.

NOTES Arundinelleae. Guzman 2004.

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