Poaceae
Raddia

Raddia angustifolia Soderstr. & Zuloaga

First published in Brittonia 37: 32 (1985)
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. Culms erect; 25-30 cm long; wiry. Lateral branches lacking. Leaves cauline; 6-9 per branch. Leaf-sheaths ribbed; pilose. Ligule a ciliolate membrane; 0.8-1 mm long. Leaf-blade base broadly rounded; with a brief petiole-like connection to sheath; petiole 0.1 cm long; petiole pubescent. Leaf-blades linear, or lanceolate; 3-5 cm long; 2-4 mm wide. Leaf-blade margins scabrous. Leaf-blade apex acute.
Morphology Reproductive morphology Inflorescences
Monoecious; with male and female spikelets in different inflorescences. Inflorescence composed of racemes; axillary; embraced at base by subtending leaf. Axillary inflorescences present in lower axils. Racemes 1; single; bearing few fertile spikelets; bearing 2-3 fertile spikelets on each. Rhachis angular. Spikelets solitary. Fertile spikelets pedicelled. Male spikelets sessile and pedicelled; 1 in a cluster, or 2 in a cluster. Pedicels filiform (male), or cuneate (female). Male inflorescence terminal; unlike female; a panicle, or of few spikelets (5-15). Male spikelets distinct from female; 1 flowered; separately deciduous; linear; 4.5 mm long; glabrous. Male spikelet glumes absent. Male spikelet lemma 3 -veined.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 3.2-4.5 mm long; breaking up at maturity; disarticulating below each fertile floret.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 3.2-4.5 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 lanceolate; 3-3.8 mm long; 0.8-1 length of upper glume; chartaceous; firmer on margins; pallid; without keels; 5 -veined. Lower glume surface asperulous; rough at apex; glabrous. Lower glume apex acuminate. Upper glume lanceolate; 3.2-4.5 mm long; 1.2-1.7 length of adjacent fertile lemma; chartaceous; with cartilaginous margins; pallid; without keels; 3 -veined. Upper glume surface asperulous; rough at apex. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile florets female. Fertile lemma elliptic; 2.6 mm long; coriaceous; without keel; 5 -veined. Lemma margins involute. Lemma apex obtuse. Palea coriaceous; 2 -veined.
Morphology Reproductive morphology Flowers
Lodicules 3. Anthers 3; 2.2-3 mm long.
sex Male
Male inflorescence terminal; unlike female; a panicle, or of few spikelets (5-15). Male spikelets distinct from female; 1 flowered; separately deciduous; linear; 4.5 mm long; glabrous. Male spikelet glumes absent. Male spikelet lemma 3 -veined.
Distribution
South America: Brazil.
Reference
Olyreae. Soderstrom.
Diagnostic
1 female inflorescence per node.
[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