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bitter beachgrass, bitter panicgrass, bitter panicum

aquatic panicum, Chesapeake panicgrass

Habit Plants perennial; rhizomatous, rhizomes stout, glabrous and glaucous throughout. Plants perennial; more or less cespitose, rhizomatous or stoloniferous, free-floating or rooting in shallow water.
Culms

20-250 cm tall, 3-10 mm thick, erect or decumbent, simple or branched from the lower nodes;

nodes glabrous;

internodes glabrous, glaucous.

30-150 cm tall, 3-7 mm thick, compressed, spongy, glabrous, decumbent and rooting at the lower nodes in shallow water;

nodes glabrous;

internodes glabrous, smooth.

Sheaths

shorter or longer than the internodes, not keeled, glabrous;

collars often glaucous and purplish;

ligules 1-5 mm;

blades 7-50 cm long, 2-13 mm wide, erect or ascending, firm, thick, flat basally, more or less involute towards the apices.

usually shorter than the internodes, not keeled, glabrous or sparsely hispid distally;

ligules 1-4 mm;

blades 10-40 cm long, 5-15 mm wide, flat, glabrous, contracted basally, attenuate distally, apices acute.

Panicles

10-80 cm long, 2-17 cm wide, contracted, slightly nodding;

primary branches whorled or opposite, strongly ascending to appressed;

pedicels 0.5-15 mm, appressed to slightly divergent.

10-25 cm long, 5-17 cm wide, shortly exserted or included basally;

primary branches 4-12 cm, ascending to spreading, secondary and higher order branches confined to the distal 2/3, pedicels 1-4 mm, sharply 3-angled, ascending to appressed.

Spikelets

4-7.7 mm long, 1.5-2 mm wide, narrowly ovoid, glabrous, acuminate;

lower florets staminate.

3-4 mm long, 0.8-2 mm wide, lanceolate.

Glumes

and lower lemmas relatively thick;

lower glumes 2.8-4 mm, 1/2 - 4/5 as long as the spikelets, 3-9-veined, apices of the midveins sometimes scabridulous;

upper glumes and lower lemmas extending 1.5-3 mm beyond the upper florets, apices stiffly gaping;

upper glumes 3.9-7.6 mm, 5-9-veined;

lower lemmas slightly shorter than the upper glumes, 7-9-veined, lower paleas 3-7 mm, oblong-hastate, folded over the anthers;

lower florets staminate;

upper florets 2.4-3.9 mm long, 1-1.8 mm wide, narrowly ovoid to oblong, glabrous, smooth, shiny, lemma margins clasping the paleas only at the base.

Lower

glumes 0.5-0.9 mm, 1/5 – 1/3 as long as the spikelets, rounded, glabrous, truncate, weakly 1-3-veined;

upper glumes and lemmas subequal, glabrous, 9-11-veined, veins prominent, apices acute to accuminate;

lower paleas about 2/3 as long as the lower lemmas;

lower florets sterile;

upper florets 2-2.7 mm, narrowly ellipsoid, smooth, shiny, yellowish.

2n

= 36, 54.

= 54.

Panicum amarum

Panicum paludosum

Distribution
from FNA
AL; CT; DE; FL; GA; LA; MA; MD; MS; NC; NJ; NM; NY; PA; RI; SC; TX; VA; WV
[WildflowerSearch map]
[BONAP county map]
from FNA
MD
[BONAP county map]
Discussion

Panicum amarum grows in the coastal dunes, wet sandy soils, and the margins of swamps, along the Atlantic Ocean and the Gulf of Mexico from Connecticut to northeastern Mexico. It is also known, as an introduction, from a few inland locations in New Mexico, North Carolina, and West Virginia, as well as in the Bahamas and Cuba.

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

Panicum paludosum is an Asian species that grows in shallow water. It has been found in Baltimore, Maryland, but may not be established there.

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

Key
1. Rhizomes short or ascending; culms often bunched and decumbent, usually more than 120 cm tall; lower glumes with 3-5 less evident veins, the midvein smooth distally; spikelet density high; panicles with 2 or more main branches per node; spikelets 4-5.9 mm long
subsp. amarulum
1. Rhizomes horizontally elongate; culms mostly solitary, less than 150 cm tall; lower glumes with 7-9 prominent veins, the midvein scabridulous distally; spikelet density moderate; panicles with 1 or 2 main branches per node; spikelets 4.7-7.7 mm long
subsp. amarum
Source FNA vol. 25, p. 472. FNA vol. 25, p. 470.
Parent taxa Poaceae > subfam. Panicoideae > tribe Paniceae > Panicum > subg. Panicum > sect. Repentia Poaceae > subfam. Panicoideae > tribe Paniceae > Panicum > subg. Panicum > sect. Dichotomiflora
Sibling taxa
P. anceps, P. antidotale, P. bergii, P. bisulcatum, P. brachyanthum, P. bulbosum, P. capillare, P. capillarioides, P. coloratum, P. dichotomiflorum, P. diffusum, P. flexile, P. ghiesbreghtii, P. gymnocarpon, P. hallii, P. hemitomon, P. hirsutum, P. hirticaule, P. lacustre, P. miliaceum, P. mohavense, P. obtusum, P. paludosum, P. philadelphicum, P. plenum, P. psilopodium, P. repens, P. rigidulum, P. tenerum, P. trichoides, P. urvilleanum, P. verrucosum, P. virgatum
P. amarum, P. anceps, P. antidotale, P. bergii, P. bisulcatum, P. brachyanthum, P. bulbosum, P. capillare, P. capillarioides, P. coloratum, P. dichotomiflorum, P. diffusum, P. flexile, P. ghiesbreghtii, P. gymnocarpon, P. hallii, P. hemitomon, P. hirsutum, P. hirticaule, P. lacustre, P. miliaceum, P. mohavense, P. obtusum, P. philadelphicum, P. plenum, P. psilopodium, P. repens, P. rigidulum, P. tenerum, P. trichoides, P. urvilleanum, P. verrucosum, P. virgatum
Subordinate taxa
P. amarum subsp. amarulum, P. amarum subsp. amarum
Name authority Elliott Roxb.
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