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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Olyra amapana

HABIT Perennial; caespitose. Culms erect; 45–50 cm long; woody. Culm-internodes hollow; distally pubescent. Culm-nodes brown; pubescent. Leaves cauline. Leaf-sheaths ribbed; pubescent. Ligule an eciliate membrane; 0.5–0.7 mm long. Leaf-blade base broadly rounded; asymmetrical; with a brief petiole-like connection to sheath; petiole 0.3–0.4 cm long; petiole pubescent. Leaf-blades lanceolate; 14.5–17 cm long; 35–42 mm wide. Leaf-blade venation parallel.

INFLORESCENCE Monoecious; with male and female spikelets in the same inflorescence. Inflorescence a panicle; terminal and axillary.

Panicle contracted; linear; 2.7–4 cm long; 1–1.5 cm wide; bearing few spikelets (1–4 female). Primary panicle branches bearing spikelets almost to the base.

Sexes segregated; on unisexual branches; with male below. Spikelets solitary. Fertile spikelets pedicelled. Male spikelets pedicelled. Pedicels (female) clavate; angular.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 11 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume elliptic; 11 mm long; 1 length of upper glume; herbaceous; without keels; 7 -veined. Lower glume apex caudate; awned; 1 -awned. Lower glume awn 3–20 mm long. Upper glume elliptic; 10.3 mm long; 1.1 length of adjacent fertile lemma; herbaceous; without keels; 7 -veined. Upper glume surface asperulous; rough above. Upper glume apex acuminate.

FLORETS Fertile florets female. Fertile lemma elliptic; dorsally compressed; 9.7 mm long; indurate; pallid; shiny; without keel; 7 -veined. Lemma surface smooth; pubescent; hairy all along. Lemma margins involute. Lemma apex acute. Palea indurate; without keels.

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

FRUIT Disseminule comprising a floret.

MALE Male spikelets distinct from female; 1 flowered; lanceolate; 4–6.6 mm long; hairy. Male spikelet glumes absent. Male spikelet lemma 3–5 -veined; muticous.

DISTRIBUTION South America: Brazil.

NOTES Olyreae. Sod & Zuol.

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