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Descriptions

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

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

Panicum peristypum

HABIT Perennial. Rhizomes short. Culms decumbent; 80 cm long; rooting from lower nodes. Culm-internodes elliptical in section; 7–12 cm long; distally glabrous. Culm-nodes constricted; brown; glabrous. Leaf-sheaths 5–9 cm long; glabrous on surface; outer margin hairy. Ligule a ciliate membrane; 0.3 mm long. Collar pubescent. Leaf-blade base amplexicaul. Leaf-blades lanceolate, or oblong; 7–15 cm long; 15–30 mm wide. Leaf-blade surface pubescent. Leaf-blade margins ciliate. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; effuse; 1.5 cm long; 8 cm wide. Primary panicle branches not whorled. Panicle axis eglandular; with scattered hairs. Panicle branches flexuous; scabrous; pubescent in axils.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels clavate; flexuous; scaberulous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 2.4–2.5 mm long; 1 mm wide; falling entire.

GLUMES Glumes dissimilar; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; not clasping; 1.2–1.4 mm long; 0.5 length of spikelet; membranous; without keels; 1–3 -veined. Lower glume apex acute. Upper glume elliptic; 1.9–2.3 mm long; 0.8–0.9 length of spikelet; membranous; without keels; (7–)9 -veined. Upper glume lateral veins distinct. Upper glume apex acute.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret similar to upper glume; elliptic; 1 length of spikelet; membranous; 9 -veined; acute. Palea of lower sterile floret 1.7 mm long; 0.8 length of lemma. Fertile lemma elliptic; dorsally compressed; 2.2 mm long; 0.8 mm wide; indurate; without keel. Lemma surface scaberulous; rough above. Lemma margins involute. Lemma apex acute; laterally pinched (slightly). Palea involute; indurate.

FLOWER Anthers 3; 1.4 mm long.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: Brazil.

NOTES Paniceae. Zuloaga 1994.

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