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Descriptions

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

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

Pariana obtusa

HABIT Perennial. Culms erect; 45 cm long. Leaves cauline. Leaf-sheaths glabrous on surface to pubescent. Leaf-sheath oral hairs setose; 10 mm long. Ligule an eciliate membrane; 1.5 mm long. Leaf-blade base cuneate, or broadly rounded; with a brief petiole-like connection to sheath. Leaf-blades lanceolate, or ovate; 16–19.5 cm long; 5–5.5 mm wide. Leaf-blade surface glabrous. Leaf-blade apex acuminate.

INFLORESCENCE Monoecious; with male and female spikelets in the same inflorescence. Synflorescence on a separate leafless culm. Inflorescence composed of racemes.

Racemes 1; single; erect; multilateral; 8.5 cm long. Rhachis fragile at the nodes; terminating in a spikelet. Rhachis internodes linear.

Sexes mixed (in a cluster at each node). Spikelets subtended by an involucre. Fertile spikelets sessile; 1 in the cluster. Male spikelets pedicelled; 5 in a cluster. Involucre composed of imperfect spikelets (male); with pedicels forming a cup; oblong. Pedicels fused to each other; united along margins; oblong; flattened; 1.7–3.5 mm long; pubescent; tip rectangular.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets ovate; laterally compressed; compressed slightly; 5.7–6.4 mm long; falling entire; deciduous with accessory branch structures.

GLUMES Glumes similar; exceeding apex of florets; thinner than fertile lemma. Lower glume ovate; 5.7–6.4 mm long; 1 length of upper glume; chartaceous; 1-keeled. Lower glume apex acute. Upper glume ovate; 5.7–6.4 mm long; chartaceous; 1-keeled. Upper glume apex acute.

FLORETS Fertile florets female. Fertile lemma ovate; 5–5.7 mm long; coriaceous; without keel. Lemma apex acute. Palea coriaceous.

FLOWER Lodicules 3. Anthers 15–18. Stigmas 2.

MALE Male spikelets distinct from female; 1 flowered; deciduous with the fertile; ovate; 4–5.7 mm long; glabrous; acute. Male spikelet glumes 2; triangular; 1.1–3.7 mm long; muticous. Male spikelet lemma 4–5.7 mm long; muticous.

DISTRIBUTION South America: northern South America and western South America.

NOTES Parianeae. Gr Bolivia 1997.

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