GrassBase - The Online World Grass Flora


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

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

Panicum surrectum

HABIT Perennial. Rhizomes short. Culms scandent; 45–120 cm long. Culm-internodes terete, or elliptical in section; 7–13 cm long; distally glabrous. Culm-nodes constricted; brown; glabrous. Lateral branches ample; arising from upper culm. Leaf-sheaths 4–10.5 cm long; glabrous on surface, or pilose; with tubercle-based hairs; outer margin hairy. Ligule a ciliate membrane; 0.2 mm long. Collar pubescent. Leaf-blades linear, or lanceolate; 5–12 cm long; 6–10 mm wide. Leaf-blade midrib conspicuous. Leaf-blade surface glabrous, or pubescent. Leaf-blade margins scabrous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; effuse; 3.5–15 cm long; 3–10 cm wide. Primary panicle branches whorled at lower nodes. Panicle axis eglandular, or glandular; glabrous. Panicle branches flexuous; eglandular, or glandular; glabrous; glabrous in axils.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels eglandular, or glandular; glabrous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 1.8–2.8 mm long; 0.8 mm wide; falling entire.

GLUMES Glumes dissimilar; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; not clasping; 0.9–1.3 mm long; 0.33–0.5(–0.75) length of spikelet; membranous; without keels; (1–)3 -veined. Lower glume lateral veins absent, or obscure. Lower glume apex acute. Upper glume elliptic; 1.6–2 mm long; 0.9 length of spikelet; membranous; without keels; 9 -veined. Upper glume apex acute.

FLORETS Basal sterile florets male, or 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 1.5–1.8 mm long; pilose (at tip). Fertile lemma elliptic; dorsally compressed; 1.6–1.8 mm long; indurate; without keel. Lemma surface papillose. Lemma margins involute. Lemma apex apiculate; laterally pinched and pubescent. Palea involute; indurate.

FLOWER Anthers 3; 1–1.2 mm long.

FRUIT Caryopsis with adherent pericarp; ovoid; 1.3 mm long. Embryo 0.25 length of caryopsis. Hilum punctiform.

DISTRIBUTION South America: Brazil and southern South America.

NOTES Paniceae. Zuloaga 1994.

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