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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Digitaria porrecta
HABIT Perennial. Cataphylls evident. Rhizomes elongated. Culms erect; 40–70 cm long; 4–7 -noded. Culm-nodes glabrous. Leaf-sheaths without keel; smooth, or antrorsely scabrous; glabrous on surface; outer margin glabrous. Leaf-sheath auricles erect. Ligule an eciliate membrane; 2.2–3 mm long; erose; obtuse. Leaf-blades 6–15 cm long; 2.8–4 mm wide. Leaf-blade surface glabrous, or pilose. Leaf-blade margins smooth.
INFLORESCENCE Inflorescence composed of racemes.
Racemes 2–3; digitate; spreading; unilateral; 12–27 cm long; bearing 10–20 fertile spikelets on each; secondarily branched. Central inflorescence axis 0.5–2 cm long. Rhachis angular; smooth on margins. Spikelet packing lax.
Spikelets solitary, or in pairs. Fertile spikelets pedicelled; 1–2 in the cluster. Pedicels 1–2 mm long; scabrous; glabrous; tip cupuliform.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 5.2–6.9 mm long; 0.9–1 mm wide; falling entire. Rhachilla internodes elongated between glumes.
GLUMES Glumes shorter than spikelet; thinner than fertile lemma. Lower glume oblong; 1.1–1.6 mm long; 0.2 length of spikelet; membranous; 0 -veined. Lower glume lateral veins absent. Lower glume apex truncate, or obtuse. Upper glume lanceolate, or elliptic; 4.6–6.5 mm long; 0.8–0.9 length of spikelet; membranous; without keels; 5 -veined. Upper glume surface pubescent. Upper glume margins eciliate, or ciliate. Upper glume apex acute.
FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret lanceolate, or elliptic; 4.5–6.1 mm long; 1 length of spikelet; membranous; 7 -veined; without cross-veins; pilose; hairy between veins, or between veins but central interspaces glabrous; acute, or acuminate. Fertile lemma elliptic; 4.5–5.5 mm long; cartilaginous; much thinner on margins; without keel. Lemma surface reticulate. Lemma margins flat; covering most of palea. Lemma apex acute, or acuminate. Palea cartilaginous.
DISTRIBUTION Australasia: Australia.
NOTES Paniceae. Webster 1993.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
