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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 setosa

HABIT Perennial. Rhizomes short. Culms erect; 80–120 cm long. Leaves cauline. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 2 mm long; brown. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.8 cm long. Leaf-blades lanceolate; 20–30 cm long; 30–58 mm wide. Leaf-blade surface glabrous. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

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

Racemes 1; single; erect; multilateral; 15–20 cm long. Rhachis fragile at the nodes. 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; with pedicels forming a cup; oblong. Pedicels fused to each other; united along margins; oblong; flattened; tip rectangular.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets ovate; laterally compressed; compressed slightly; 7–8 mm long; falling entire; deciduous with accessory branch structures.

GLUMES Glumes similar; exceeding apex of florets; thinner than fertile lemma. Lower glume ovate; 7–8 mm long; 1 length of upper glume; chartaceous; 1-keeled. Lower glume apex acute. Upper glume ovate; 7–8 mm long; 1.2–1.4 length of adjacent fertile lemma; chartaceous; 1-keeled. Upper glume apex acute.

FLORETS Fertile florets female. Fertile lemma ovate; 5.5 mm long; coriaceous; without keel. Lemma apex acute. Palea coriaceous; without keels.

FLOWER Lodicules 3. Stigmas 2.

MALE Male spikelets distinct from female; 1 flowered; deciduous with the fertile; ovate; 6–8 mm long; hairy (glume margins). Male spikelet glumes 2; linear; 6–8 mm long. Male spikelet lemma 6–8 mm long; with cross-veins.

DISTRIBUTION South America: western South America.

NOTES Parianeae. Gr Peru 1995.

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