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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Filgueirasia arenicola
HABIT Perennial. Rhizomes short; pachymorph. Culms 50–110 cm long; 2–3 mm diam.; woody. Culm-internodes terete; hollow; distally glabrous. Culm-nodes glabrous. Lateral branches dendroid. Branch complement several; in a horizontal line; with subequal branches; thinner than stem. Culm-sheaths deciduous. Leaf-sheaths scaberulous; glabrous on surface; outer margin hairy. Leaf-sheath oral hairs setose. Ligule a ciliolate membrane. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.1 cm long; petiole pubescent. Leaf-blades linear; 5–9 cm long; 1 mm wide.
INFLORESCENCE Synflorescence simple. Inflorescence composed of racemes; subtended by an unspecialized leaf-sheath; embraced at base by subtending leaf; with 1–3 peduncles per sheath.
Racemes 1; single; bearing few fertile spikelets; bearing 1–4 fertile spikelets on each.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 4–6 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 30–40 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes elongated between glumes and elongated below proximal fertile floret; curved; 2–3 mm long; glabrous, or pubescent.
GLUMES Glumes two, or several; (1–)2(–3) empty glumes. Lower glume lanceolate; 10 mm long; 1-keeled; 9–11 -veined. Lower glume apex acute, or acuminate; awned; 1 -awned. Lower glume awn 1–1.5 mm long. Upper glume lanceolate; 12 mm long; 9–11 -veined. Upper glume apex acute, or acuminate; awned; 1 -awned. Upper glume awn 1–1.5 mm long.
FLORETS Fertile lemma lanceolate; 12–13 mm long; chartaceous; keeled; 11–13 -veined. Lemma margins ciliate. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn 0.5–1 mm long overall. Palea 9 -veined. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.
FLOWER Lodicules 3; membranous; veined. Anthers 3; 6 mm long. Stigmas 2.
FRUIT Caryopsis with adherent pericarp.
DISTRIBUTION South America: Brazil.
NOTES Bambuseae. MacClure 1995.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
