Isachne hirtiglumis

HABIT Annual. Culms decumbent; 10–35 cm long. Leaf-sheaths glabrous on surface, or pilose; outer margin hairy. Ligule a fringe of hairs. Leaf-blades linear, or lanceolate; (1.8–)2–4.5 cm long; 3–4(–5) mm wide. Leaf-blade surface pilose; sparsely hairy; hairy on both sides.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong; 1–4(–8) cm long. Panicle branches capillary.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels glandular.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets orbicular; dorsally compressed; (1.5–)1.8–2 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes deciduous; similar; shorter than spikelet; thinner than fertile lemma. Lower glume lanceolate, or elliptic; 1.2–1.5 mm long; 0.66–0.75 length of spikelet; membranous; without keels; 7 -veined. Lower glume surface hirsute. Lower glume hairs 0.7–0.8 mm long. Lower glume apex acute. Upper glume lanceolate, or elliptic; 1.2–1.3 length of adjacent fertile lemma; 0.66 length of spikelet; membranous; without keels; 7 -veined. Upper glume surface hirsute. Upper glume hairs 0.7–0.8 mm long. Upper glume apex acute.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret oblong; 1.7–1.8 mm long; 1 length of spikelet; coriaceous; yellow; scaberulous; rough above. Fertile lemma orbicular; 1.2–1.3 mm long; 0.8 mm wide; coriaceous; yellow; without keel. Lemma surface pubescent. Lemma margins involute.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: Brazil.

NOTES Isachneae. Longhi-Wagner & Welker 2015.

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