Poaceae
Raddia

Raddia soderstromii R.P.Oliveira, L.G.Clark & Judz.

First published in Pl. Syst. Evol. 270: 178 (2008)
This species is accepted
The native range of this species is E. Brazil. It is a herbaceous bamboo and grows primarily in the seasonally dry tropical biome.

Descriptions

Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E. https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.19592

Conservation
Predicted extinction risk: not threatened. Confidence: low confidence
[AERP]

Morphology General Habit
Perennial; caespitose. Rhizomes elongated. Culms erect; (20-)35-78(-100) cm long; (1.5-)2-3 mm diam. Culm-internodes distally glabrous. Culm-nodes brown; pubescent. Lateral branches lacking. Leaves cauline; (2-)3-9(-10) per branch. Leaf-sheaths pubescent. Ligule a ciliolate membrane; 0.4-0.7 mm long. Leaf-blade base broadly rounded; asymmetrical; with a brief petiole-like connection to sheath; petiole 0.06-0.2(-0.4) cm long; petiole pubescent. Leaf-blades elliptic, or ovate; (4.5-)6-13.5 cm long; (22-)27-37 mm wide. Leaf-blade surface pilose; hairy abaxially, or on both sides. Leaf-blade margins scabrous. Leaf-blade apex obtuse; asymmetrical and apiculate.
Morphology Reproductive morphology Inflorescences
Monoecious; with male and female spikelets in different inflorescences. Inflorescence composed of racemes; axillary; with 1-4(-6) peduncles per sheath. Peduncle 1.7-7 cm long. Racemes 1; single; 1.8-3.9 cm long; 2-4(-7) mm wide; bearing few fertile spikelets; bearing 4-10(-18) fertile spikelets on each. Rhachis angular; pubescent on surface. Spikelets solitary. Fertile spikelets pedicelled. Male spikelets pedicelled. Pedicels filiform (male), or cuneate (female); ciliate. Male inflorescence terminal; unlike female; a panicle (2.5-9.5cm). Male spikelets distinct from female; 1 flowered; separately deciduous; lanceolate; 4-5.5 mm long; hairy. Male spikelet glumes absent. Male spikelet lemma 3 -veined; muticous, or awned; with 1-1.5 mm long awn.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate, or ovate; dorsally compressed; 5-9(-10) mm long; 1-2 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; 5-9(-10) mm long; 1-2 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; 4.8-9(-10) mm long; chartaceous; much thinner on margins; without keels; 3-5 -veined. Lower glume apex acuminate; muticous, or mucronate, or awned; 1 -awned. Lower glume awn (0.6-)1-4(-6) mm long. Upper glume lanceolate, or ovate; 4.8-9(-10) mm long; chartaceous; with cartilaginous margins; without keels; 3-5 -veined. Upper glume apex acuminate; muticous, or mucronate, or awned; 1 -awned. Upper glume awn (0.6-)1-4(-6) mm long.
Morphology Reproductive morphology Flowers Florets
Fertile florets female. Fertile lemma ovate; 4-5.2 mm long; 0.7-1.5 mm wide; coriaceous; without keel. Lemma margins involute. Lemma apex obtuse. Palea coriaceous.
Morphology Reproductive morphology Flowers
Lodicules 3. Anthers 3.
sex Male
Male inflorescence terminal; unlike female; a panicle (2.5-9.5cm). Male spikelets distinct from female; 1 flowered; separately deciduous; lanceolate; 4-5.5 mm long; hairy. Male spikelet glumes absent. Male spikelet lemma 3 -veined; muticous, or awned; with 1-1.5 mm long awn.
Distribution
South America: Brazil.
Reference
Olyreae. Oliveira & L-Wagner 2009.
[GB]

Sources

  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0

  • 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

  • Herbarium Catalogue Specimens

    • Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 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 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0