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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 sociata

HABIT Perennial. Rhizomes short. Culms geniculately ascending; 40–60 cm long. Leaves cauline. Leaf-sheaths keeled. Leaf-sheath oral hairs setose. Ligule an eciliate membrane; 0.5 mm long; truncate. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.1 cm long; petiole pubescent. Leaf-blades elliptic; 8.5–12 cm long; 17–35 mm wide. Leaf-blade surface scaberulous; rough adaxially; puberulous; hairy abaxially. Leaf-blade margins serrulate. 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; 7–8 cm long; 10–13 mm wide. 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; 4 mm long; pubescent; tip rectangular.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets ovate; laterally compressed; compressed slightly; 6 mm long; falling entire; deciduous with accessory branch structures.

GLUMES Glumes similar; exceeding apex of florets; thinner than fertile lemma. Lower glume ovate; 6 mm long; 1 length of upper glume; chartaceous; 1-keeled; 3 -veined. Lower glume surface pubescent. Lower glume apex acute. Upper glume ovate; 6 mm long; 1.2 length of adjacent fertile lemma; chartaceous; 1-keeled; 3 -veined. Upper glume surface pubescent. Upper glume apex acute.

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

FLOWER Lodicules 3. Anthers 2 mm long. Stigmas 2.

MALE Male spikelets distinct from female; 1 flowered; deciduous with the fertile; ovate; 5 mm long; hairy. Male spikelet glumes 2; 2–3 mm long. Male spikelet lemma 5 mm long.

DISTRIBUTION South America: western South America and Brazil.

NOTES Parianeae. Gr Peru 1995.

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