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Descriptions

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

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

Rehia nervata

HABIT Perennial. Culms erect, or geniculately ascending; 12–19 cm long; swollen at the base; forming an elongated corm. Culm-internodes retrorsely scabrous. Culm-nodes pubescent. Leaves cauline. Leaf-sheaths retrorsely scabrous. Ligule an eciliate membrane. Leaf-blade base broadly rounded; with a brief petiole-like connection to sheath. Leaf-blades oblong; 2–4.5 cm long; 7–16 mm wide. Leaf-blade apex acute.

INFLORESCENCE Monoecious; with male and female spikelets in the same inflorescence. Inflorescence composed of racemes; terminal and axillary; embraced at base by subtending leaf. Axillary inflorescences similar to terminal.

Racemes 1; single; 1–2 cm long; bearing few fertile spikelets; bearing 2–5 fertile spikelets on each.

Sexes mixed. Spikelets in pairs. Fertile spikelets pedicelled; 1 in the cluster. Male spikelets pedicelled; 1 in a cluster. Pedicels filiform (male), or cuneate (female).

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 7–8 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes deciduous; similar; with lower wider than upper; exceeding apex of florets; thinner than fertile lemma. Lower glume ovate; 7–8 mm long; 1.1 length of upper glume; chartaceous; without keels; 9 -veined. Lower glume apex acuminate. Upper glume ovate; 6–7 mm long; 1.2 length of adjacent fertile lemma; chartaceous; without keels; 7 -veined. Upper glume apex acute.

FLORETS Fertile florets female. Fertile lemma elliptic; 5.5 mm long; indurate; without keel. Lemma surface pubescent. Lemma margins involute; covering most of palea. Lemma apex acute. Palea indurate.

FLOWER Lodicules 3. Anthers 3.

MALE Male spikelets distinct from female; 1 flowered; separately deciduous; lanceolate; 5 mm long; glabrous. Male spikelet glumes absent. Male spikelet lemma 5 -veined; muticous.

DISTRIBUTION South America: northern South America and Brazil.

NOTES Olyreae. WDC.

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