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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.
Arundinella deppeana
HABIT Perennial. Rootstock evident. Culms erect, or geniculately ascending; robust; 100–400 cm long; 3–7 mm diam. Culm-internodes hollow. Culm-nodes pubescent. Leaf-sheaths hispid; with tubercle-based hairs; outer margin hairy. Ligule a ciliolate membrane; 0.2–0.3 mm long. Leaf-blades 25–50 cm long; 8–25 mm wide. Leaf-blade surface hispid; hairy on both sides.
INFLORESCENCE Inflorescence a panicle; bearing juvenile spikelets at emergence. Peduncle 4–30 cm long; glabrous.
Panicle open; lanceolate; dense; 20–60 cm long; contracted about primary branches.
Spikelets in pairs. Fertile spikelets pedicelled; 2 in the cluster. Pedicels glabrous.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 3.8–4.8 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose; obtuse.
GLUMES Glumes persistent; dissimilar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 2.8–3.2 mm long; 0.75 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume apex attenuate. Upper glume lanceolate; 2.5 length of adjacent fertile lemma; 1 length of spikelet; membranous; 1-keeled; 5 -veined. Upper glume apex attenuate.
FLORETS Basal sterile florets male; with palea; persisting on inflorescence. Lemma of lower sterile floret similar to upper glume; lanceolate; 2.3–2.5 mm long; membranous; 1-keeled; 3 -veined; acute. Fertile lemma lanceolate; 1.5 mm long; coriaceous; without keel; 3 -veined. Lemma lateral veins obscure. Lemma surface asperulous. Lemma margins involute; interlocking with palea keels. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 10–13 mm long overall; with a straight or slightly twisted column. Palea with auriculate flaps; coriaceous; 2 -veined. Palea surface asperulous.
FLOWER Lodicules 2; cuneate; fleshy. Anthers 3; 0.7–1 mm long. Stigmas 2.
FRUIT Caryopsis with adherent pericarp. Hilum punctiform.
DISTRIBUTION North America: Mexico. South America: Mesoamericana, Caribbean, Brazil, and southern South America.
NOTES Arundinelleae. Fl Costa Rica 1993.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
