Poaceae
Raddia

Raddia maculata (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 E. Brazil. It is a herbaceous bamboo and grows primarily in the wet tropical biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Cataphylls evident. Rhizomes short. Culms erect; 35 cm long; without nodal roots. Culm-internodes ridged. Culm-nodes constricted; brown, or black; glabrous to pubescent. Leaves cauline; 4-8 per branch. Leaf-sheaths narrower than blade at the collar; ribbed; papillose; pilose. Ligule a ciliate membrane; 0.2 mm long. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades ascending to drooping; triangular, or ovate; 6-7 cm long; 2-2.5 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 pubescent above. Panicle open; pyramidal; loose; 15 cm long; 5 cm wide. Primary panicle branches whorled at lower nodes; 7-8 cm long. Panicle branches hispid. Sexes segregated; on bisexual branches; with male below. Spikelets solitary to in pairs. Fertile spikelets pedicelled. Male spikelets pedicelled. Pedicels ciliate (short).
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 10 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 to similar to fertile lemma in texture. Lower glume ovate; 9-10 mm long; 1 length of upper glume; firmer on margins (cartilaginous); without keels; 5 -veined. Lower glume lateral veins with cross-veins. Lower glume surface pubescent. Lower glume margins eciliate. Lower glume apex acuminate; awned (awn tip); 1 -awned. Upper glume ovate; 1 mm long; 1.2 length of adjacent fertile lemma; with cartilaginous margins; without keels; 3 -veined. Upper glume lateral veins with cross-veins. Upper glume surface pubescent. Upper glume apex attenuate.
Morphology Reproductive morphology Flowers Florets
Fertile florets bisexual. Fertile lemma elliptic to ovate; 7 mm long; herbaceous to indurate; without keel; 5 -veined. Lemma lateral veins with cross-veins. Lemma surface pitted. Lemma margins covering most of palea. Palea 0.9-1 length of lemma; membranous, or indurate; 2 -veined; without keels.
Morphology Reproductive morphology Flowers
Lodicules 3; cuneate. Stigmas 2.
Morphology Reproductive morphology Fruits
Hilum linear.
Morphology Reproductive morphology Inflorescences Spikelets
Male spikelets distinct from female; linear; 7-10 mm long; glabrous. Male spikelet glumes absent. Male spikelet lemma 3 -veined; muticous to awned. Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 10 mm long; breaking up at maturity; disarticulating below each fertile floret.
sex Male
Male spikelets distinct from female; linear; 7-10 mm long; glabrous. Male spikelet glumes absent. Male spikelet lemma 3 -veined; muticous to awned.
Distribution
South America: Brazil.
Reference
Olyreae. TB.
[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

  • Neotropikey

    • Milliken, W., Klitgard, B. and Baracat, A. (2009 onwards), Neotropikey - Interactive key and information resources for flowering plants of the Neotropics.
    • http://creativecommons.org/licenses/by/3.0