Digitaria megasthenes Goetgh.

First published in Bull. Jard. Bot. Natl. Belg. 45: 413 (1975)
This species is accepted
The native range of this species is Mozambique. It is a perennial and grows primarily in the seasonally dry tropical biome.

Descriptions

Gramineae, W. D. Clayton. Flora Zambesiaca 10:3. 1989

Morphology General Habit
A caespitose perennial on a very short rhizome, base surrounded by cataphylls.
Morphology Culms
Culms 70–110 cm., erect or ascending, glabrous, nodes dark and glabrous.
Morphology Leaves Leaf sheaths
Leaf sheaths scabrous, glabrous.
Morphology Leaves Ligules
Ligule up to 3 mm. long, triangular or truncate, shortly ciliate.
Morphology Leaves Leaf lamina
Leaf laminae 4–15 × 0.2–0.7 mm. long, linear, flat, scabrous and glabrous on both surfaces, scabrous along the margins.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of 5–11 racemes, 4–12 cm. long, erect, whorled or sometimes partly solitary along a short common axis.
Morphology Leaves Rachis
Rhachis triquetrous, winged, up to 0.5 mm. broad, smooth to scaberulous, scabrous at the margins.
Morphology Reproductive morphology Flowers Pedicel
Pedicels 2-nate, 0.2–1.5 mm. long, triangular, scabrous, somewhat broadened at the apex.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets 1.9–2.5 mm. long, oblong-lanceolate.
Morphology Reproductive morphology Inflorescences Bracts Glume
Superior glume 1/5–1/3(1/2) of the spikelet, ovate to triangular, often bifid, 0(3)-nerved, scabrous. Inferior glume very short, ovate to triangular, often truncate.
Inferior
Inferior lemma as long as the spikelet, oblong-lanceolate, 7(9)-nerved, scabrous, central zone often broad and sulcate, glabrous or with scattered bristles. Inferior glume very short, ovate to triangular, often truncate.
Morphology Reproductive morphology Inflorescences Bracts Lemma
Superior lemma as long as the spikelet, oblong-lanceolate, acute to slightly acuminate, pale yellow, often purplish tinged. Inferior lemma as long as the spikelet, oblong-lanceolate, 7(9)-nerved, scabrous, central zone often broad and sulcate, glabrous or with scattered bristles.
Superior
Superior lemma as long as the spikelet, oblong-lanceolate, acute to slightly acuminate, pale yellow, often purplish tinged. Superior glume 1/5–1/3(1/2) of the spikelet, ovate to triangular, often bifid, 0(3)-nerved, scabrous.
[FZ]

IUCN Red List of Threatened Species https://www.iucnredlist.org/species/141800425/141800435

Conservation
EN - endangered
[IUCN]

Morphology General Habit
Perennial; caespitose. Cataphylls evident. Rhizomes short. Culms erect, or geniculately ascending; 70-110 cm long. Culm-nodes brown; glabrous. Leaf-sheaths antrorsely scabrous. Ligule a ciliolate membrane; 2-3 mm long. Leaf-blades 4-15 cm long; 2-7 mm wide. Leaf-blade surface scabrous; rough on both sides. Leaf-blade margins scabrous.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes. Racemes 5-11; digitate; in several whorls; erect; unilateral; 4-12 cm long. Rhachis broadly winged; with sharp-edged midrib; 0.5 mm wide; smooth on surface, or scabrous on surface; scabrous on margins. Spikelets in pairs. Fertile spikelets pedicelled; 2 in the cluster. Pedicels angular; unequal; 0.5-1.5 mm long; scabrous; tip widened.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; dorsally compressed; 1.9-2.5 mm long; falling entire.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; dorsally compressed; 1.9-2.5 mm long; falling entire.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes two; dissimilar; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 0.1 length of spikelet; hyaline; without keels; 0 -veined. Lower glume lateral veins absent. Lower glume apex truncate, or acute. Upper glume ovate; 0.2-0.5 length of spikelet; membranous; without keels; 0-3 -veined. Upper glume surface scabrous; rough generally; glabrous. Upper glume apex entire, or dentate; 2 -fid; acute.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; 1 length of spikelet; membranous; 7(-9) -veined; without grooves, or sulcate; scabrous; rough throughout; glabrous, or setose; acute. Fertile lemma oblong; 1.9-2.5 mm long; cartilaginous; much thinner on margins; yellow; without keel. Lemma margins flat; covering most of palea. Lemma apex acute. Palea cartilaginous.
Distribution
Africa: southern tropical.
Reference
Paniceae. FZ.
[GB]

Sources

  • Flora Zambesiaca

    • Flora Zambesiaca
    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • 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/
  • IUCN Categories

    • IUCN Red List of Threatened Species
    • http://creativecommons.org/licenses/by-nc-sa/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