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Dallis grass, sticky heads

coconut paspalum

Habit Plants perennial; cespitose, rhizomatous, rhizomes short (less than 1 cm), forming a knotty base. Plants perennial; cespitose to short rhizomatous.
Culms

50-175 cm, erect;

nodes glabrous.

80-110 cm, erect;

nodes glabrous.

Sheaths

glabrous or pubescent, lower sheaths more frequently pubescent than the upper sheaths;

ligules 1.5-3.8 mm;

blades to 35 cm long, 2-16.5 mm wide, flat, mostly glabrous, adaxial surfaces with a few long hairs near the base.

glabrous, sparsely pubescent apically;

ligules 1-2.9 mm;

blades 9-41 cm long, 3-7 mm wide, mostly involute, pubescent above, glabrous below.

Panicles

terminal, with 2-7 racemosely arranged branches;

branches 1.5-12 cm, racemose, divergent;

branch axes 0.7-1.4 mm wide, winged, glabrous, margins scabrous, terminating in a spikelet.

terminal, with 1-5(10) racemosely arranged branches;

branches 1.9-11.4 cm, erect to divergent, terminating in a spikelet;

branch axes 0.4-0.7 mm wide, very narrowly winged, scabrous.

Spikelets

2.3-4 mm long, 1.7-2.5 mm wide, paired, appressed to the branch axes, ovate, tapering to an acute apex, stramineous (rarely purple).

1.6-2.2 mm long, 1.1-1.3 mm wide, paired, imbricate, appressed to the branch axes, elliptic-obovate to ovate.

Caryopses

2-2.3 mm, white to brown.

Lower

glumes absent;

upper glumes and lower lemmas 5-7-veined, margins pilose;

upper florets stramineous.

glumes absent;

upper glumes shortly pubescent, 5-veined, margins entire;

lower lemmas glabrous or shortly pubescent, lacking ribs over the veins, 3-veined, margins entire;

upper florets 1.4-2 mm, white to stramineous.

2n

= 20, 40, 50-63.

= 60.

Paspalum dilatatum

Paspalum laxum

Distribution
from FNA
AL; AR; AZ; CA; CO; DC; FL; GA; IL; KY; LA; MD; MO; MS; NC; NJ; NM; OK; OR; SC; TN; TX; VA; WV; HI; PR
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[BONAP county map]
from FNA
FL; PR; Virgin Islands
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Discussion

Paspalum dilatatum is native to Brazil and Argentina. It is now well established in the Flora region, generally as a weed in waste places. It is also used as a turf grass.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Paspalum laxum grows in hammocks and along roads, often in sandy or limestone soils. It used to be common in coconut groves, hence the English-language name. It grows in southern Florida, the Antilles, and Belize.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 25, p. 579. FNA vol. 25, p. 592.
Parent taxa Poaceae > subfam. Panicoideae > tribe Paniceae > Paspalum Poaceae > subfam. Panicoideae > tribe Paniceae > Paspalum
Sibling taxa
P. acuminatum, P. almum, P. bifidum, P. blodgettii, P. boscianum, P. caespitosum, P. conjugatum, P. conspersum, P. convexum, P. coryphaeum, P. dissectum, P. distichum, P. fimbriatum, P. floridanum, P. hartwegianum, P. intermedium, P. laeve, P. langei, P. laxum, P. lividum, P. malacophyllum, P. minus, P. modestum, P. monostachyum, P. nicorae, P. notatum, P. paniculatum, P. pleostachyum, P. plicatulum, P. praecox, P. pubiflorum, P. quadrifarium, P. racemosum, P. repens, P. scrobiculatum, P. setaceum, P. unispicatum, P. urvillei, P. vaginatum, P. virgatum, P. virletii, P. wrightii
P. acuminatum, P. almum, P. bifidum, P. blodgettii, P. boscianum, P. caespitosum, P. conjugatum, P. conspersum, P. convexum, P. coryphaeum, P. dilatatum, P. dissectum, P. distichum, P. fimbriatum, P. floridanum, P. hartwegianum, P. intermedium, P. laeve, P. langei, P. lividum, P. malacophyllum, P. minus, P. modestum, P. monostachyum, P. nicorae, P. notatum, P. paniculatum, P. pleostachyum, P. plicatulum, P. praecox, P. pubiflorum, P. quadrifarium, P. racemosum, P. repens, P. scrobiculatum, P. setaceum, P. unispicatum, P. urvillei, P. vaginatum, P. virgatum, P. virletii, P. wrightii
Name authority Poir. Lam.
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