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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 pallida

HABIT Perennial. Culms erect; 30–60 cm long. Lateral branches lacking. Leaves cauline; 10 per branch. Leaf-sheaths longer than adjacent culm internode; glandular (below throat); pubescent. Leaf-sheath oral hairs scanty. Ligule an eciliate membrane. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.3 cm long; petiole pubescent. Leaf-blades oblong; 17–18 cm long; 30–43 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; oblong; multilateral; 6 cm long. 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; 2.5 mm long; puberulous; hairy at base; tip rectangular.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 5 mm long; falling entire; deciduous with accessory branch structures.

GLUMES Glumes similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; chartaceous; without keels; 1–2 -veined. Lower glume lateral veins absent, or obscure. Lower glume apex acute. Upper glume ovate; chartaceous. Upper glume apex acute.

FLORETS Fertile florets female. Fertile lemma ovate; 4 mm long; coriaceous; without keel. 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; 4.5–5 mm long. Male spikelet glumes 2; ovate; 5–6 mm long; 1–2 -veined. Male spikelet lemma 4.5–5 mm long; with cross-veins.

DISTRIBUTION South America: northern South America.

NOTES Parianeae. Swallen 2001.

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