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Descriptions

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

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

Panicum adenorhachis

HABIT Perennial. Culms rambling. Culm-internodes terete; distally glabrous. Culm-nodes brown; glabrous, or pubescent. Lateral branches sparse. Leaf-sheaths deciduous; glandular; striately veined; glabrous on surface; outer margin hairy. Ligule a ciliate membrane; 0.2–0.6 mm long. Collar pubescent. Leaf-blade base broadly rounded. Leaf-blades lanceolate; 4–6 cm long; 3–5 mm wide; glandular (beneath). Leaf-blade surface scabrous; rough adaxially. Leaf-blade margins scabrous; tuberculate-ciliate; hairy at base.

INFLORESCENCE Inflorescence a panicle; terminal and axillary.

Panicle open; ovate; effuse; 5–7 cm long; 4–5 cm wide; bearing few spikelets. Primary panicle branches spreading; 1 -nate. Panicle branches glandular; scabrous; bearded in axils.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels clavate; pubescent.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; with a barren rhachilla extension. Spikelets elliptic; dorsally compressed; acuminate; 2.7–3 mm long; 0.9 mm wide; falling entire.

GLUMES Glumes dissimilar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 0.7–0.8 mm long; 0.25–0.33 length of spikelet; hyaline; without keels; 0–1 -veined. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume elliptic; 1 length of spikelet; membranous; without keels; 9 -veined. Upper glume surface hispidulous. Upper glume apex acute.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret similar to upper glume; elliptic; 1 length of spikelet; membranous; 9 -veined; hispidulous; acute. Palea of lower sterile floret 0.66 length of lemma. Fertile lemma elliptic; dorsally compressed; 2.3 mm long; 0.8 mm wide; indurate; light brown; without keel. Lemma surface papillose. Lemma margins involute. Lemma apex acute; mucronate. Palea embraced by lemma; involute; indurate.

FRUIT Caryopsis ellipsoid; 1.5 mm long; light brown. Embryo 0.4–0.5 length of caryopsis.

DISTRIBUTION South America: Brazil.

NOTES Paniceae. Zuloaga 1994.

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