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Descriptions

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

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

Paspalum phaeotrichum

HABIT Annual. Culms erect, or geniculately ascending, or decumbent; 18–28 cm long; 0.8–0.9 mm diam.; rooting from lower nodes. Culm-internodes distally glabrous. Culm-nodes purple; glabrous. Leaf-sheaths 1–6 cm long; keeled; striately veined; glabrous on surface. Leaf-sheath oral hairs ciliate. Ligule an eciliate membrane; 0.5–0.7 mm long; erose; acute. Leaf-blades lanceolate; 4.5–5.5 cm long; 2 mm wide. Leaf-blade surface ribbed; grooved adaxially. Leaf-blade margins ciliate; hairy at base. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes. Peduncle 4.5–9 cm long; glabrous.

Racemes 2; paired; flexuous; unilateral; 2–4 cm long. Rhachis narrowly winged; angular; 0.4 mm wide; glabrous on surface. Spikelet packing abaxial; lax; 2 -rowed. Raceme-bases hirsute.

Spikelets solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; plano-convex; acute; 4–4.1 mm long; 1.1–1.4 mm wide; falling entire.

GLUMES Glumes one the lower absent or obscure; reaching apex of florets; thinner than fertile lemma. Upper glume ovate; 4–4.1 mm long; 1 length of spikelet; membranous; without keels; 7 -veined. Upper glume surface pilose; hairy below. Upper glume margins ciliate. Upper glume hairs tawny; 1–3 mm long. Upper glume apex acute.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret ovate; 4 mm long; 1 length of spikelet; membranous; 5 -veined; pilose; hairy below; acute. Fertile lemma elliptic; 3.1–3.3 mm long; 1–1.1 mm wide; cartilaginous; pallid; without keel; 5 -veined. Lemma surface glabrous. Lemma margins involute. Palea separating from lemma above; involute; coriaceous.

FLOWER Lodicules 2. Anthers 3; 2.1–2.2 mm long; yellow.

FRUIT Caryopsis with adherent pericarp; obovoid; dorsally compressed; plano-convex; 1.8 mm long; pallid; emarginate. Hilum elliptic, or linear; 0.5 length of caryopsis.

DISTRIBUTION South America: Brazil.

NOTES Paniceae. Valls et al 2009.

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