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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 parviglume

HABIT Perennial. Rootstock evident. Culms decumbent; 100–120 cm long; 1.5 mm diam.; rooting from lower nodes. Culm-internodes distally pilose; with tubercle-based hairs. Culm-nodes constricted; pubescent. Leaf-sheaths pilose; with tubercle-based hairs; outer margin hairy. Ligule a ciliolate membrane; 0.7–1 mm long. Collar bearded. Leaf-blade base broadly rounded; asymmetrical. Leaf-blades ovate; 8–20 cm long; 15–25 mm wide. Leaf-blade midrib prominent beneath. Leaf-blade surface hispid; sparsely hairy; with tubercle-based hairs. Leaf-blade margins cartilaginous; scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; pyramidal; 20 cm long; 10 cm wide. Panicle axis scabrous. Panicle branches scabrous.

Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels 1–2 length of fertile spikelet; scabrous; 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; compressed strongly; subacute; 2.2–2.5 mm long; falling entire.

GLUMES Glumes dissimilar; reaching apex of florets; thinner than fertile lemma. Lower glume oblate; 0.3–0.5 mm long; 0.2 length of spikelet; membranous; without keels; 0 -veined. Lower glume lateral veins absent. Lower glume apex obtuse. Upper glume ovate; 2.2–2.3 mm long; 1 length of spikelet; membranous; without keels; 5 -veined. Upper glume apex acute.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; ovate; 2.2–2.3 mm long; 1 length of spikelet; membranous; 5 -veined; acute. Fertile lemma ovate; dorsally compressed; 2 mm long; indurate; shiny; without keel. Lemma surface striate. Lemma margins involute. Lemma apex obtuse. Palea involute; indurate.

FLOWER Anthers 3; 1 mm long; yellow.

DISTRIBUTION North America: Mexico. South America: Mesoamericana.

NOTES Paniceae. Fl Costa Rica 1994.

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