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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 amplexicaulis
HABIT Perennial. Culms decumbent; robust; 200–350 cm long; spongy; rooting from lower nodes. Culm-internodes solid. Culm-nodes glabrous. Leaf-sheaths glabrous on surface; outer margin glabrous, or hairy. Ligule an eciliate membrane; 1–2.5 mm long. Leaf-blade base amplexicaul. Leaf-blades lanceolate; 15–33 cm long; 12–28 mm wide. Leaf-blade surface glabrous. Leaf-blade margins scabrous; tuberculate-ciliate; hairy at base. Leaf-blade apex acuminate.
INFLORESCENCE Inflorescence a panicle.
Panicle spiciform; linear; 10–40 cm long; 1–2 cm wide.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels oblong.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; acuminate; 3.5–5.5 mm long; falling entire.
GLUMES Glumes dissimilar; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 1–1.7 mm long; 0.3 length of spikelet; hyaline; without keels; 3 -veined. Lower glume apex cuspidate. Upper glume lanceolate; 2.8–3.9 mm long; 0.7–0.8 length of spikelet; membranous; without keels; 5 -veined. Upper glume apex caudate; 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; 3.6–4.6 mm long; 1 length of spikelet; membranous; 5 -veined; caudate. Fertile lemma lanceolate; 2.5–3.5 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; 1.1–1.2 mm long.
FRUIT Caryopsis ellipsoid.
DISTRIBUTION Africa: west tropical. Asia-temperate: China and eastern Asia. Asia-tropical: India, Indo-China, Malesia, and Papuasia. Australasia: Australia. North America: Mexico. 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.
