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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Isachne hoi

HABIT Perennial; caespitose. Butt sheaths glabrous, or pilose. Culms decumbent; 45–85 cm long; rooting from lower nodes. Culm-internodes 3–15 cm long; distally glabrous. Culm-nodes glabrous. Lateral branches lacking, or sparse. Leaf-sheaths 2–7 cm long; mostly shorter than adjacent culm internode; glabrous on surface; outer margin hairy. Leaf-sheath oral hairs ciliate. Ligule a fringe of hairs; 2 mm long. Leaf-blade base broadly rounded. Leaf-blades lanceolate; 4.5–13.5 cm long; 8–18 mm wide. Leaf-blade midrib indistinct. Leaf-blade surface scabrous; pubescent; hairy on both sides; with tubercle-based hairs. Leaf-blade margins cartilaginous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle; terminal, or terminal and axillary.

Panicle open; ovate; effuse; 10–20 cm long; 10–15 cm wide. Primary panicle branches 1 -nate; 8–10 cm long. Panicle axis glandular; scaberulous. Panicle branches straight, or flexuous; glandular; scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 2 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes deciduous; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume ovate; 2 mm long; 1.1–1.3 length of spikelet; herbaceous; much thinner on margins; mid-green and purple; without keels; 7–9 -veined. Lower glume surface pubescent; hairy above. Lower glume apex obtuse. Upper glume ovate; 2 mm long; 1.1–1.3 length of spikelet; herbaceous; with hyaline margins; mid-green and purple; without keels; 7–9 -veined. Upper glume surface pubescent; hairy above. Upper glume apex obtuse.

FLORETS Fertile florets alike but female above. Fertile lemma orbicular; 1.5–1.8 mm long; cartilaginous; light brown; without keel. Lemma surface puberulous. Lemma margins involute. Lemma apex obtuse. Palea cartilaginous.

FLOWER Anthers 3; 1 mm long; brown.

FRUIT Caryopsis with adherent pericarp; ellipsoid, or orbicular; laterally compressed; 1.2 mm long; dark brown.

DISTRIBUTION Asia-temperate: China.

NOTES Isachneae. Keng 1996.

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