Poaceae
Raddia

Raddia monophylla (Soderstr.) J.R.Grande

First published in Bol. Centro Invest. Biol. Univ. Zulia 50: 35 (2016)
This species is accepted
The native range of this species is Brazil (Bahia). It is a herbaceous bamboo and grows primarily in the wet tropical biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Rhizomes short. Culms 50-100 cm long; without nodal roots. Culm-nodes black. Lateral branches lacking. Leaves cauline; 1 per branch. Ligule absent. Leaf-blade base with a false petiole. Leaf-blades elliptic; 20-38 cm long; 40-100 mm wide. Leaf-blade venation with distinct cross veins. Leaf-blade apex acute.
Morphology Reproductive morphology Inflorescences
Monoecious; with male and female spikelets in the same inflorescence. Synflorescence on a specialized culm bearing a single leaf-blade, or on a separate leafless culm. Inflorescence a panicle. Peduncle pilose above. Panicle open; pyramidal; 8-17 cm long; 8-10 cm wide. Primary panicle branches whorled at lower nodes; 5-10 cm long. Panicle branches pubescent. Sexes segregated; on bisexual branches; with male below. Spikelets solitary. Fertile spikelets pedicelled. Male spikelets pedicelled. Pedicels linear; tip pyriform.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 6.5-8.5 mm long; breaking up at maturity; disarticulating below each fertile floret.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes deciduous; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume ovate; 1 length of upper glume; membranous; firmer on margins; without keels; 5 -veined. Lower glume lateral veins with cross-veins. Lower glume surface concave. Lower glume apex acuminate; awned. Lower glume awn 2 mm long. Upper glume ovate; 1.25 length of adjacent fertile lemma; membranous; with cartilaginous margins; without keels; 3 -veined. Upper glume lateral veins with cross-veins. Upper glume surface pubescent. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile florets female. Fertile lemma elliptic; 5.7 mm long; indurate; pallid; without keel; 5 -veined. Lemma surface punctate. Lemma margins covering most of palea. Lemma apex acute. Palea 1.1 length of lemma; indurate; without keels.
Morphology Reproductive morphology Flowers
Lodicules 3; cuneate; 1 mm long; veined. Anthers 3; 4 mm long.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp. Hilum linear. Endosperm farinose.
Morphology Reproductive morphology Inflorescences Spikelets
Male spikelets distinct from female; 1 flowered; separately deciduous; linear; 5-7 mm long. Male spikelet glumes absent. Male spikelet lemma 3 -veined; awned. Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 6.5-8.5 mm long; breaking up at maturity; disarticulating below each fertile floret.
sex Male
Male spikelets distinct from female; 1 flowered; separately deciduous; linear; 5-7 mm long. Male spikelet glumes absent. Male spikelet lemma 3 -veined; awned.
Distribution
South America: Brazil.
Reference
Olyreae. WDC.
[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