Diplachne fusca (L.) P.Beauv. ex Roem. & Schult.

Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E. https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.19592

Conservation

Predicted extinction risk: not threatened. Confidence: confident

Bernal, R., Gradstein, S.R. & Celis, M. (eds.). 2015. Catálogo de plantas y líquenes de Colombia. Instituto de Ciencias Naturales, Universidad Nacional de Colombia, Bogotá. http://catalogoplantasdecolombia.unal.edu.co

Distribution

Nativa en Colombia; Alt. 0 - 500 m.; Llanura del Caribe, Sierra Nevada de Santa Marta.

Morphology General Habit

Hierba

Conservation

No Evaluada

M. Thulin et al. Flora of Somalia, Vol. 1-4 [updated 2008] https://plants.jstor.org/collection/FLOS

Morphology General Habit

Densely tufted aquatic or semi-aquatic perennial up to 1.5 m high, rooting and branching from the lower nodes; leaves linear, finely tapered

Morphology Reproductive morphology Inflorescences

Inflorescence 20–35 cm long, composed of 10–30 racemes each 7–15 cm long and bearing loosely arranged, indistinctly secund spikelets

Morphology Reproductive morphology Inflorescences Spikelets

Spikelets 6–15 mm long, 7- to 11-flowered, subterete; lower glume 1.4–2.2 mm long; upper glume 2–3.4 mm long; lemma 2.2–4 mm long, rounded on the back, pilose on the nerves below, tipped with a short mucro 0.1–0.3 mm long

Morphology Reproductive morphology Fruits

Caryopsis dorsally compressed.

Distribution

C2 tropical and subtropical Old World.

Ecology

Altitude c. 600 m.

Note

The single collection from Somalia cited by Chiovenda (1929) has not been seen and the record needs confirmation.

IUCN Red List of Threatened Species https://www.iucnredlist.org/species/164100/120214516

Conservation

LC - least concern

Morphology General Habit

Perennial. Culms decumbent; 60-150 cm long; rooting from lower nodes. Ligule an eciliate membrane; 3-8 mm long; acute. Leaf-blades flat, or convolute; 25-55 cm long; 3-5 mm wide; stiff; mid-green and grey-green. Leaf-blade midrib widened. Leaf-blade surface scabrous. Leaf-blade apex attenuate.

Morphology Reproductive morphology Inflorescences

Inflorescence composed of racemes. Racemes 10-30; borne along a central axis; erect; straight; unilateral; 7-15 cm long. Central inflorescence axis 15-30 cm long. Rhachis semiterete. Spikelet packing broadside to rhachis; lax. Spikelets solitary. Fertile spikelets pedicelled, or sessile. Pedicels filiform; 0.5-1.5 mm long.

Morphology Reproductive morphology Inflorescences Spikelets

Spikelets comprising 6-11 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; compressed slightly; 8-15 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes eventually visible between lemmas. Floret callus evident; pubescent; obtuse; disarticulating obliquely.

Fertile

Spikelets comprising 6-11 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; compressed slightly; 8-15 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes eventually visible between lemmas. Floret callus evident; pubescent; obtuse; disarticulating obliquely.

Morphology Reproductive morphology Inflorescences Bracts Glume

Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 2.1-4.6 mm long; 0.6-0.7 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute, or acuminate. Upper glume oblong; 3.3-7.4 mm long; 1-1.3 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume apex obtuse, or acute; mucronate.

Morphology Reproductive morphology Flowers Florets

Fertile lemma oblong; 3.2-5.9 mm long; membranous; dark green, or grey; without keel; 3 -veined. Lemma midvein ciliate; hairy below. Lemma lateral veins close to margins. Lemma margins pilose; hairy below. Lemma apex dentate; 2 -fid; mucronate, or awned; 1 -awned. Principal lemma awn from a sinus; 0.3-1.6 mm long overall. Palea 2 -veined. Palea keels scabrous. Palea surface pubescent; hairy on flanks. Apical sterile florets resembling fertile though underdeveloped.

Morphology Reproductive morphology Flowers

Lodicules 2; cuneate; fleshy. Anthers 3; 0.2-2.7 mm long.

Morphology Reproductive morphology Fruits

Caryopsis with adherent pericarp; ellipsoid; flattened; concavo-convex; 1.6-1.8 mm long.

Distribution

Africa: north, west tropical, west-central tropical, northeast tropical, east tropical, southern tropical, south, and western Indian ocean. Asia-temperate: western Asia, Arabia, China, and eastern Asia. Asia-tropical: India, Indo-China, Malesia, and Papuasia. Australasia: Australia. Pacific: southwestern and north-central. North America: northwest USA, north-central USA, northeast USA, southwest USA, south-central USA, southeast USA, and Mexico. South America: Mesoamericana, Caribbean, northern South America, western South America, Brazil, and southern South America.

Reference

Eragrostideae. =Diplachne fusca. FTEA.

Gramineae, T. Cope. Flora Zambesiaca 10:2. 1999

Morphology General Habit

Aquatic or semi-aquatic rhizomatous perennial up to 200 cm tall, rooting and branching from the lower nodes; ligule a pointed membrane; leaf lamina 25–55 cm × 2–5 mm, tough, linear, involute, greyish-green with a broad white central nerve, tapering to a fine point.

Morphology Reproductive morphology Inflorescences

Inflorescence 20–35 cm long, compact and cylindrical at first, later more open; racemes numerous, slender, 7–15 cm long, ± straight.

Morphology Reproductive morphology Inflorescences Spikelets

Spikelets 6–11-flowered, 8–15 mm long, narrowly elliptic to elliptic, slightly overlapping; glumes unequal, keeled, the inferior 2–4.5 mm long, lanceolate to narrowly lanceolate, acute or acuminate, the superior 3.3–7.5 mm long, narrowly oblong, acute or obtuse and minutely mucronate; lemmas 3.2–5.9 mm long, narrowly oblong, dorsally rounded, pilose on the nerves below, 2- or more toothed at the apex and mucronate or shortly awned.

Morphology Reproductive morphology Fruits

Caryopsis 1.6–1.8 mm long, elliptic-oblong, dorsiventrally flattened.