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Descriptions

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

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

Arundinella goeringii

HABIT Perennial; caespitose. Culms erect, or geniculately ascending; 25–125 cm long. Culm-internodes smooth; distally glabrous. Leaf-sheaths pilose; with tubercle-based hairs. Ligule a ciliate membrane. Leaf-blades 3.5–26 cm long; 4–15 mm wide; mid-green. Leaf-blade surface smooth; pilose; hairy on both sides; with tubercle-based hairs. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle; bearing juvenile spikelets at emergence.

Panicle open, or contracted; lanceolate; equilateral, or nodding; 5–35 cm long. Panicle axis scabrous. Panicle branches angular.

Spikelets solitary, or in pairs. Fertile spikelets pedicelled; 1 in the cluster, or 2 in the cluster. Pedicels angular; 0.5–6.5 mm long.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 4.5–5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose; obtuse.

GLUMES Glumes persistent; dissimilar; exceeding apex of florets; thinner than fertile lemma. Lower glume ovate; 2.75–3.75 mm long; 0.66 length of upper glume; membranous; purple; 1-keeled; 5 -veined. Lower glume surface glabrous, or pilose. Lower glume apex acute; muticous, or mucronate. Upper glume ovate; 4.5–5.5 length of adjacent fertile lemma; membranous; purple; 1-keeled; 5 -veined. Upper glume surface glabrous, or pilose. Upper glume apex acute.

FLORETS Basal sterile florets male; with palea; persisting on inflorescence. Lemma of lower sterile floret similar to upper glume; ovate; 2.75–3.75 mm long; membranous; 1-keeled; 5 -veined; acute. Fertile lemma ovate; dorsally compressed; 2–2.25 mm long; coriaceous; without keel; 5 -veined. Lemma lateral veins obscure. Lemma surface asperulous. Lemma margins involute; interlocking with palea keels. Lemma apex entire; awned; 1 -awned. Principal lemma awn geniculate; 4.5–7 mm long overall; with twisted column. Palea with auriculate flaps; 1 length of lemma; coriaceous; 2 -veined. Palea surface asperulous.

FLOWER Lodicules 2; cuneate; fleshy. Anthers 3. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-tropical: Malesia.

NOTES Arundinelleae. Fl Java 1997.

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