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 sabulorum

HABIT Perennial. Rhizomes short. Culms 50–100 cm long; without nodal roots, or rooting from lower nodes. Culm-internodes distally hirsute. Culm-nodes black; glabrous, or pubescent. Lateral branches ample; arising from lower culm and upper culm. Leaves heterophyllous (narrow on older culms). Leaf-sheaths 2.5–6 cm long; eglandular, or glandular; glabrous on surface to hirsute; outer margin hairy. Ligule a ciliate membrane; 0.4–1.1 mm long. Leaf-blade base amplexicaul. Leaf-blades filiform; 1–9 cm long; 2–14 mm wide; stiff, or firm. Leaf-blade midrib indistinct. Leaf-blade surface glabrous, or hispid. Leaf-blade margins scabrous; ciliate; hairy at base. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle; terminal and axillary. Axillary inflorescences similar to terminal.

Panicle open; ovate; effuse; 2–10 cm long; 2–8 cm wide. Panicle axis eglandular, or glandular; glabrous, or pilose. Panicle branches eglandular, or glandular; glabrous, or pilose.

Spikelets solitary, or in pairs. Fertile spikelets pedicelled. Pedicels clavate; eglandular, or glandular; ciliate.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets obovate; dorsally compressed; 1.9–3 mm long; 0.9–1.4 mm wide; falling entire.

GLUMES Glumes similar; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; clasping; 0.5–0.75 length of spikelet; membranous; without keels; 3–5 -veined. Lower glume apex obtuse, or acute. Upper glume elliptic; 0.9 length of spikelet; membranous; without keels; 7–9 -veined. Upper glume surface glabrous, or pilose. Upper glume apex obtuse.

FLORETS Basal sterile florets male, or barren; with palea. Lemma of lower sterile floret similar to upper glume; elliptic; 1 length of spikelet; membranous; 7–9 -veined; glabrous, or pilose; acute. Palea of lower sterile floret 1.6 mm long; pilose; adorned on flanks. Fertile lemma elliptic; dorsally compressed; 1.8–2.5 mm long; 0.7–1.2 mm wide; indurate; yellow; shiny; without keel. Lemma margins involute. Lemma apex apiculate. Palea involute; indurate.

FRUIT Caryopsis with adherent pericarp; ellipsoid; 1.5 mm long. Embryo 0.5 length of caryopsis. Hilum punctiform.

DISTRIBUTION North America: northeast USA and southeast USA. South America: western 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.