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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 nervata

HABIT Perennial. Rhizomes short. Culms erect; 90–130 cm long. Lateral branches lacking. Leaves cauline. Leaf-sheaths longer than adjacent culm internode; glabrous on surface, or pilose. Leaf-sheath oral hairs scanty. Leaf-sheath auricles erect. Ligule an eciliate membrane; 3 mm long; truncate. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades oblong; 15–26 cm long; 40–60 mm wide. Leaf-blade surface scabrous; rough abaxially. 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; drooping; oblong; multilateral; 20 cm long; 13 mm wide. Rhachis fragile at the nodes. Spikelet packing crowded.

Sexes mixed (in a cluster at each node). Spikelets appressed; 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; cuneate; flattened; 3 mm long; puberulous; tip rectangular.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 8 mm long; falling entire; deciduous with accessory branch structures.

GLUMES Glumes similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 8 mm long; chartaceous; without keels; 3 -veined. Lower glume lateral veins with cross-veins. Lower glume surface asperulous. Lower glume apex acute. Upper glume ovate; 8 mm long; chartaceous; 3 -veined. Upper glume lateral veins with cross-veins. Upper glume surface asperulous. Upper glume apex acute.

FLORETS Fertile florets female. Fertile lemma ovate; 6 mm long; coriaceous; without keel. Lemma surface scaberulous; rough above. Lemma apex acute. Palea 1 length of lemma; coriaceous; without keels.

FLOWER Lodicules 3. Stigmas 2.

MALE Male spikelets distinct from female; 1 flowered; deciduous with the fertile; ovate; 6.5–8 mm long; hairy (glume margins). Male spikelet glumes 2; ovate; 5–6 mm long; 2–3 -veined. Male spikelet lemma 6.5–8 mm long; 5 -veined.

DISTRIBUTION South America: Brazil.

NOTES Parianeae. Swallen 2001.

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