Poaceae
Raddia

Raddia megaphylla R.P.Oliveira & Longhi-Wagner

First published in Pl. Syst. Evol. 270: 173 (2008)
This species is accepted
The native range of this species is Brazil (Bahia, Espírito Santo). It is a herbaceous bamboo and grows primarily in the wet tropical biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Rhizomes short. Culms erect; 40-65 cm long; 0.4-1 mm diam. Culm-internodes distally glabrous. Culm-nodes brown; pubescent. Lateral branches lacking. Leaves cauline; 1-2 per branch. Leaf-sheaths pilose. Ligule a ciliolate membrane; 0.2-0.4 mm long. Leaf-blade base asymmetrical; with a brief petiole-like connection to sheath; petiole (0.1-)0.15-0.33(-0.47) cm long; petiole pubescent. Leaf-blades lanceolate, or ovate; (7.2-)9-24.5 cm long; (20-)31-58 mm wide. Leaf-blade midrib conspicuous. Leaf-blade surface glabrous, or hirsute; hairy abaxially. Leaf-blade apex acute; asymmetrical.
Morphology Reproductive morphology Inflorescences
Monoecious; with male and female spikelets in different inflorescences. Inflorescence a panicle; comprising (5-)11-31(-42) fertile spikelets; axillary; with 1-3 peduncles per sheath. Peduncle (1-)7.8-15 cm long. Panicle open; ovate; (1.4-)2.4-5(-5.5) cm long; (0.4-)2-3.5 cm wide. Panicle axis pubescent. Spikelets solitary. Fertile spikelets pedicelled. Male spikelets pedicelled. Pedicels filiform (male), or cuneate (female); ciliate. Male inflorescence terminal; unlike female; a panicle (3-9cm). Male spikelets distinct from female; 1 flowered; separately deciduous; lanceolate; 3.5-5.2 mm long; glabrous. Male spikelet glumes absent. Male spikelet lemma 3 -veined; awned; with 0.5-0.7 mm long awn.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate, or ovate; dorsally compressed; (4-)5-9.2 mm long; (1-)1.4-2.2 mm wide; breaking up at maturity; disarticulating below each fertile floret.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate, or ovate; dorsally compressed; (4-)5-9.2 mm long; (1-)1.4-2.2 mm wide; breaking up at maturity; disarticulating below each fertile floret.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes deciduous; similar; reaching apex of florets; thinner than fertile lemma. Lower glume lanceolate, or ovate; 4-10 mm long; chartaceous; much thinner on margins; without keels; 3-5 -veined. Lower glume apex acuminate; mucronate, or awned; 1 -awned. Lower glume awn 0.7-5 mm long. Upper glume lanceolate, or ovate; 4-10 mm long; chartaceous; with cartilaginous margins; without keels; 3-5 -veined. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile florets female. Fertile lemma lanceolate; (3.2-)4.5-5.1 mm long; (0.8-)1-1.9 mm wide; coriaceous; without keel. Lemma margins involute. Lemma apex obtuse. Palea coriaceous.
Morphology Reproductive morphology Flowers
Lodicules 3. Anthers 3.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; 3 mm long; light brown. Hilum linear; 1 length of caryopsis.
sex Male
Male inflorescence terminal; unlike female; a panicle (3-9cm). Male spikelets distinct from female; 1 flowered; separately deciduous; lanceolate; 3.5-5.2 mm long; glabrous. Male spikelet glumes absent. Male spikelet lemma 3 -veined; awned; with 0.5-0.7 mm long awn.
Distribution
South America: Brazil.
Reference
Olyreae. Oliveira & L-Wagner 2009.
[GB]

Sources

  • GrassBase - The Online World Grass Flora

    • Clayton, W.D., Vorontsova, M.S., Harman, K.T. and Williamson, H. (2006 onwards). GrassBase - The Online World Grass Flora.
    • http://creativecommons.org/licenses/by-nc-sa/3.0

  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2023. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0

  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2023. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0