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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Panicum soderstromii
HABIT Perennial; caespitose. Cataphylls evident. Glands sunken crateriform. Culms erect; robust; 45–95 cm long. Culm-internodes terete; hollow, or solid; striate; distally pilose. Culm-nodes constricted; brown; pubescent. Lateral branches ample; arising from mid culm and upper culm. Leaf-sheaths tight; longer than adjacent culm internode; pilose; with tubercle-based hairs. Ligule a ciliate membrane; 0.5 mm long. Collar dark; pubescent. Leaf-blade base broadly rounded; with a brief petiole-like connection to sheath. Leaf-blades lanceolate; 2–13 cm long; 7–13 mm wide; stiff. Leaf-blade midrib indistinct. Leaf-blade surface pubescent; hairy on both sides. Leaf-blade apex attenuate.
INFLORESCENCE Inflorescence composed of racemes.
Racemes numerous; borne along a central axis; ascending; unilateral; 1–5 cm long. Central inflorescence axis 8–18 cm long; puberulous. Rhachis angular. Raceme-bases pilose.
Spikelets in pairs. Fertile spikelets pedicelled. Pedicels unequal; bearing a few hairs; hairy at tip.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 2–2.8 mm long; 1–1.5 mm wide; falling entire.
GLUMES Glumes similar; shorter than spikelet; thinner than fertile lemma; gaping. Lower glume ovate; 0.5–0.75 length of spikelet; membranous; without keels; 3 -veined. Lower glume surface asperulous; pilose; hairy at apex. Lower glume apex acute. Upper glume ovate; 0.9 length of spikelet; membranous; without keels; 3–5 -veined. Upper glume surface asperulous. Upper glume margins ciliate. Upper glume apex acute.
FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret similar to upper glume; ovate; 1 length of spikelet; membranous; glandular (2–4 glands); 5 -veined; scaberulous; ciliate on margins; acute. Palea of lower sterile floret pilose (at tip). Fertile lemma ovate; dorsally compressed; 1.1–1.4 mm long; 0.4–0.7 mm wide; indurate; yellow, or dark brown; shiny; without keel. Lemma margins involute. Palea involute; indurate.
FLOWER Anthers 3; 0.8–1.1 mm long.
FRUIT Caryopsis with adherent pericarp; ovoid; 1.5 mm long; yellow. Embryo 0.33 length of caryopsis. Hilum elliptic.
DISTRIBUTION South America: Brazil.
NOTES Paniceae. Zuloaga 1996.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
