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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 modesta

HABIT Perennial. Rhizomes short. Culms geniculately ascending; slender; 15–35 cm long. Culm-internodes distally glabrous. Leaves cauline. Leaf-sheaths mostly shorter than adjacent culm internode. Leaf-sheath oral hairs setose. Ligule an eciliate membrane; membranous. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades lanceolate; 3–7.6 cm long; 5–14 mm wide. Leaf-blade surface scaberulous; rough adaxially; pubescent (sometimes obscure). Leaf-blade margins serrulate. Leaf-blade apex acuminate.

INFLORESCENCE Monoecious; with male and female spikelets in the same inflorescence. Synflorescence on a specialized culm bearing a single leaf-blade. Inflorescence composed of racemes; subtended by an inflated leaf-sheath.

Racemes 1; single; erect; multilateral; 3–4 cm long; 6–8 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; falling entire; deciduous with accessory branch structures.

GLUMES Glumes similar; exceeding apex of florets; thinner than fertile lemma. Lower glume ovate; 3–4 mm long; 1 length of upper glume; chartaceous; 1-keeled; 3 -veined. Lower glume surface pubescent. Lower glume apex acute. Upper glume ovate; 3–4 mm long; 1 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 surface scaberulous. Lemma apex acute. Palea 1–1.2 length of lemma; coriaceous; without keels. Palea apex acute.

FLOWER Lodicules 3. Anthers 15–25. Stigmas 2.

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

DISTRIBUTION South America: Brazil.

NOTES Parianeae. Swallen 2000.

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