Sporobolus coromandelianus (Retz.) Kunth

Indian whorled dropseed


Info

Subfamily: Chloridoideae
Genus etymology: Sporobolus = "seed thrower" referring to the seed being ejected from the pericarp
Species etymology: coromandelianus = from the Coromandel region in south-eastern India
Photosynthetic type: C4 (warm season)
Nativity: naturalized - accidental
First recorded in Hawaiʻi: 2022

Map

 Distribution of Sporobolus coromandelianus in Hawaiʻi.

Inflorescence

Sporobolus coromandelianus Inflorescence
Sporobolus coromandelianus Inflorescence
Sporobolus coromandelianus Inflorescence
Sporobolus coromandelianus Inflorescence
Sporobolus coromandelianus Inflorescence
Sporobolus coromandelianus Inflorescence
Sporobolus coromandelianus Inflorescence
Sporobolus coromandelianus Inflorescence
Sporobolus coromandelianus Inflorescence
Sporobolus coromandelianus Inflorescence

Plant

Sporobolus coromandelianus Plant

Habit

Sporobolus coromandelianus Habit
Sporobolus coromandelianus Habit
Sporobolus coromandelianus Habit

Spikelets

Sporobolus coromandelianus Spikelets
Sporobolus coromandelianus Spikelets
Sporobolus coromandelianus Spikelets
Sporobolus coromandelianus Spikelets
Sporobolus coromandelianus Spikelets
Sporobolus coromandelianus Spikelets

Description

Tufted annual; culms 7–20 cm. high, erect or ascending. Leaf-blades broadly linear, 2–10 cm. long, 2–4 mm. wide, the margins scabrid or with a few long stiff hairs near the base. Panicle ovate, 2–8 cm. long; primary branches in whorls, spreading horizontally soon after emergence from the uppermost leaf-sheath. Spikelets 1–1.4 mm. long, glabrous or scaberulous, greyish green; lower glume a little oblong scale, 0.1–0.5 mm. long; upper glume oblong-elliptic, as long as the spikelet; lemma similar, but a little shorter; anthers 3, 0.2–0.3 mm. long. Grain obovate, 0.7–0.8 mm. long.
(Description source: Clayton, W.D. 1970. Flora of Tropical East Africa. Gramineae (Part 1). Crown Agents for Oversea Governments and Administrations, London. 176 pp. )

Annual up to 20 cm high; leaves flat, 2–4 mm wide. Panicle ovate, 2–8 cm long; primary branches in whorls, the lowest never barren. Spikelets 1–1.4 mm long; lower glume oblong, 0.1–0.5 mm long; upper glume oblong-elliptic, as long as the spikelet; lemma similar to the upper glume but a little shorter; anthers 3, 0.2–0.3 mm long. Grain obovate, 0.7–0.8 mm long.
(Description source: Cope, T.A, (1995) Flora Somalia, Vol 4. Royal Botanical Gardens, Kew, London. 312 pp. )

Caespitose annual; culms up to 25 cm tall, erect or ascending, branched or unbranched; leaf sheaths chartaceous, usually glabrous, sometimes with tubercle-based hairs near the margins above, lightly compressed; leaf laminas 2–10 cm × 2–4 mm, flat, glabrous or scattered tuberculate-pilose on the surface, scabrid on the margins or with a few long stiff tubercle-based hairs below, acute or subacute at the apex.Panicle 2–8 cm long, ovate; branches in a succession of whorls, smooth, with numerous elongated viscid glandular patches, the spikelets 2–3 on secondary branchlets, these ± confined to the distal part of the primary branches.Spikelets (1)1.2–1.4(1.6) mm long, greyish-green; inferior glume 1/4–1/3 the length of the spikelet, oblong, nerveless, glabrous, obtuse at the apex; superior glume as long as the spikelet, oblong-elliptic, 1-nerved, glabrous to scaberulous or minutely asperulous, acute at the apex; lemma as long as the spikelet or almost so, oblong-elliptic; anthers 3, (0.2)0.3–0.55 mm long.Grain obovate, 0.7–0.8 mm long, terete or lightly laterally compressed.
(Description source: Pope, G.V. (ed). 1999. Flora Zambesiaca. Volume 10. Part 2. Kew, London. 261 pp. )

Caespitose annual; culms up to 25 cm tall, erect or ascending, branched or unbranched; leaf sheaths chartaceous, usually glabrous, sometimes with tubercle based hairs near the margins above, lightly compressed; leaf laminas 2–10 cm × 2–4 mm, flat, glabrous or scattered tuberculate-pilose on the surface, scabrid on the margins or with a few long stiff tubercle-based hairs below, acute or subacute at the apex. Panicle 2–8 cm long, ovate; branches in a succession of whorls, smooth, with numerous elongated viscid glandular patches, the spikelets 2–3 on secondary branchlets, these ± confined to the distal part of the primary branches. Spikelets (1)1.2–1.4(1.6) mm long, greyish-green; inferior glume 1/4–1/3 the length of the spikelet, oblong, nerveless, glabrous, obtuse at the apex; superior glume as long as the spikelet, oblong-elliptic, 1-nerved, glabrous to scaberulous or minutely asperulous, acute at the apex; lemma as long as the spikelet or almost so, oblong-elliptic; anthers 3, (0.2)0.3–0.55 mm long. Grain obovate, 0.7–0.8 mm long, terete or lightly laterally compressed.
(Description source: Pope, G.V. (ed). 1999. Flora Zambesiaca. Volume 10. Part 2. Kew, London. 261 pp. )