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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.
Hymenachne donacifolia
HABIT Perennial. Culms decumbent; robust; 300–400 cm long; 4–6 mm diam.; rooting from lower nodes. Culm-internodes solid. Lateral branches lacking. Leaf-sheaths glabrous on surface; outer margin hairy. Ligule an eciliate membrane; 0.4–0.5 mm long. Leaf-blade base cordate, or amplexicaul. Leaf-blades lanceolate; 25–27 cm long; 27–40 mm wide. Leaf-blade margins scabrous. Leaf-blade apex acuminate.
INFLORESCENCE Inflorescence a panicle.
Panicle contracted; linear, or lanceolate; 20–50 cm long; contracted about primary branches. Primary panicle branches appressed; 1–6 cm long; bearing spikelets almost to the base.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels linear.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; acuminate; 2.5–2.9 mm long; falling entire.
GLUMES Glumes dissimilar; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; clasping; 0.9–1.1 mm long; 0.3–0.4 length of spikelet; hyaline; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 2–2.1 mm long; 0.7–0.8 length of spikelet; membranous; without keels; 3 -veined. Upper glume apex acute; awned; 1 -awned. Upper glume awn 0.5 mm long.
FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; lanceolate; 2.3–2.6 mm long; 1 length of spikelet; membranous; 3 -veined; caudate. Fertile lemma ovate; 2–2.2 mm long; cartilaginous; pallid; without keel; 3 -veined. Lemma margins involute. Lemma apex acuminate. Palea separating from lemma above; involute; 1 length of lemma; cartilaginous; 2 -veined; without keels. Palea apex acuminate.
FLOWER Anthers 3; 0.5 mm long.
DISTRIBUTION South America: Mesoamericana, Caribbean, northern South America, western South America, Brazil, and southern South America.
NOTES Paniceae. Fl Costa Rica.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
