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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Acroceras chaseae

HABIT Perennial. Culms decumbent; 50–100 cm long; rooting from lower nodes. Leaf-sheaths 2–4 cm long; pilose. Ligule an eciliate membrane, or a ciliolate membrane; 2–4 mm long. Leaf-blade base broadly rounded; symmetrical, or asymmetrical. Leaf-blades lanceolate; 8–12 cm long; 12–20 mm wide. Leaf-blade surface glabrous, or pilose.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 3–8; borne along a central axis; unilateral; 1.5–7 cm long; secondarily branched. Rhachis angular. Spikelet packing distant; irregular.

Spikelets ascending; solitary, or in pairs. Fertile spikelets pedicelled; 1 in the cluster, or 2 in the cluster. Pedicels linear; angular; unequal; 2–7 mm long.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 4.2–4.7 mm long; 1.4–1.6 mm wide; falling entire. Spikelet callus square; glabrous; base truncate. Rhachilla internodes elongated between glumes.

GLUMES Glumes dissimilar; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 2.1–2.5 mm long; 0.5 length of spikelet; herbaceous; without keels; 3–5 -veined. Lower glume surface pilose; hairy at apex. Lower glume apex obtuse. Upper glume elliptic; 3.6–4 mm long; 0.8–0.9 length of spikelet; herbaceous; 5 -veined. Upper glume surface pilose; hairy at apex. Upper glume apex obtuse.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret similar to upper glume; ovate; 1 length of spikelet; herbaceous; 5 -veined; pilose; hairy at apex; obtuse. Fertile lemma elliptic; dorsally compressed; 3.5–4 mm long; 1.2–1.4 mm wide; indurate; pallid. Lemma margins involute. Lemma apex acute; pubescent and with a little green crest. Palea reflexed at apex; elliptic; involute; 1 length of lemma; indurate; 2 -veined. Palea apex pubescent and with green spots.

FRUIT Disseminule comprising a spikelet.

DISTRIBUTION South America: Brazil.

NOTES Paniceae. Zuloaga.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.