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

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

  • 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 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