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Descriptions

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

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

Myriocladus involutus

HABIT Perennial; caespitose; clumped densely. Rhizomes short; pachymorph. Culms erect; 50–100 cm long. Culm-internodes terete; 2.5–8 cm long; distally glabrous. Lateral branches ample; arising from upper culm. Leaf-sheaths longer than adjacent culm internode; without keel, or keeled; smooth; glabrous on surface. Leaf-sheath oral hairs setose; 3–5 mm long. Ligule an eciliate membrane; 0.1 mm long. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.1 cm long. Leaf-blades ascending; deciduous at the ligule; linear; involute; 4.5–6.5 cm long; 0.7–1.5 mm wide; coriaceous; glaucous. Leaf-blade surface glabrous. Leaf-blade apex obtuse.

INFLORESCENCE Inflorescence composed of racemes; axillary.

Racemes 1; single; 2.5–3.5 cm long; bearing few fertile spikelets; bearing 4–7 fertile spikelets on each. Rhachis angular; scabrous on surface; glabrous on surface.

Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels oblong.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 2 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 7–8 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma. Lower glume lanceolate, or oblong; 2–2.5 mm long. Lower glume apex obtuse, or acute. Upper glume lanceolate; 3.2–5.5 mm long; membranous; without keels; 1(–3) -veined. Upper glume primary vein conspicuous. Upper glume lateral veins absent, or obscure. Upper glume apex acute; mucronate.

FLORETS Basal sterile florets barren; without significant palea; persisting on inflorescence. Lemma of lower sterile floret similar to fertile lemma; lanceolate; 4.5–5 mm long; membranous. Fertile lemma lanceolate; 6–7 mm long; coriaceous; without keel. Rhachilla extension 2 mm long. Apical sterile florets 1 in number; ovate; 3 mm long.

FLOWER Lodicules 3. Anthers 3. Stigmas 2.

FRUIT Caryopsis with adherent pericarp; ovoid; isodiametric; purple; acute. Embryo 0.15 length of caryopsis. Hilum linear.

DISTRIBUTION South America: northern South America.

NOTES Bambuseae. Jud. & Dav. 2001.

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