Digitaria arushae Clayton

First published in Kew Bull. 29: 518 (1974)
This species is accepted
The native range of this species is Ethiopia to Tanzania. It is a perennial and grows primarily in the seasonally dry tropical biome.

Descriptions

Gramineae, W. D. Clayton, S. M. Phillips & S. A. Renvoize. Flora of Tropical East Africa. 1974

Morphology General Habit
Perennial with a knotty rootstock clad in tomentose scales; culms 50–100 cm. high, hard, almost cane-like, geniculately ascending.
Morphology Leaves
Leaf-blades broadly linear to narrowly lanceolate, 3–15 cm. long, 3–9 mm. wide.
Morphology Reproductive morphology Inflorescences
Inflorescence lanceolate, 8–20 cm. long, of numerous short spreading racemes arranged in untidy whorls on a long central axis; racemes 2–6 cm. long, the spikelets paired on a triquetrous rhachis sparsely adorned (especially towards the base) with long glistening hairs.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets narrowly elliptic, 1.8–2.2 mm. long; lower glume absent; upper glume 3/4–4/5 as long as the spikelet, 3-nerved, pubescent; lower lemma as long as the spikelet, 7-nerved, appressedly pubescent; fruit ellipsoid, light brown.
Habitat
Open places in deciduous bushland; 1000–2000 m.
Distribution
K4 T1 T2
[FTEA]

Morphology General Habit
Perennial. Rootstock evident. Cataphylls evident. Butt sheaths pubescent. Culms geniculately ascending; 50-100 cm long; woody. Ligule an eciliate membrane. Leaf-blades linear, or lanceolate; 3-15 cm long; 3-9 mm wide.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes. Racemes numerous; borne along a central axis; in several whorls; spreading; unilateral; 2-6 cm long. Central inflorescence axis 8-20 cm long. Rhachis wingless; angular; with scattered hairs. Spikelets in pairs. Fertile spikelets pedicelled; 2 in the cluster. Pedicels unequal.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 1.8-2.2 mm long; falling entire.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 1.8-2.2 mm long; falling entire.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes one the lower absent or obscure; shorter than spikelet; thinner than fertile lemma. Upper glume elliptic; 0.75-0.8 length of spikelet; membranous; without keels; 3 -veined. Upper glume surface pubescent. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets barren; without significant palea. Lemma of lower sterile floret elliptic; 1 length of spikelet; membranous; 7 -veined; pubescent; acute. Fertile lemma elliptic; 1.8-2.2 mm long; cartilaginous; much thinner on margins; light brown; without keel. Lemma margins flat; covering most of palea. Lemma apex acute. Palea cartilaginous.
Distribution
Africa: east tropical.
Reference
Paniceae. FTEA.
[GB]

Sources

  • Flora of Tropical East Africa

    • Flora of Tropical East Africa
    • 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/
  • 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