Panicum lacustre

Hitchc. & Ekman
Common names: Cypress-swamp panicum
Treatment appears in FNA Volume 25. Treatment on page 467.

Plants perennial; emergent aquatic or terrestrial, rooting at the lower nodes. Culms 100-150 cm, erect, succulent, with short innovations; nodes glabrous; internodes glabrous. Sheaths compressed, not keeled, overlapping but narrow, exposing the nodes, bladeless and glabrous or sparsely pilose below the water; ligules 1-2 mm, membranous, ciliate; blades 1-30 cm long, 2-4 mm wide, narrow, linear, flat or folded, abaxial surfaces sparsely pubescent, adaxial surfaces sparsely pilose. Panicles 10-30 cm, open, with many spikelets; primary branches fascicled at the base of the panicles, solitary and distant distally; pedicels 1-4 mm, sharply 3-angled, appressed. Spikelets 2-2.2 mm, glabrous. Lower glumes truncate to broadly triangular, 1/4 as long as the spikelets, 3-veined; lower paleas absent; upper glumes and lower lemmas equal, slightly exceeding the upper florets, 5-veined or 7-veined, pointed; lower florets sterile; upper florets relatively thin, smooth. 2n = unknown.

Discussion

Panicum lacustre grows in shallow water or wet soil at the edge of cypress ponds in the Everglades of southern Florida. It also grows in Cuba.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number."-11-veined" is not declared as a valid unit of measurement for this property."thin" is not a number.

... more about "Panicum lacustre"
puberulent +
acute +, obtuse +, rounded +  and attenuate +
anatomy +  and kranz +
Robert W. Freckmann +  and Michel G. Lelong +
Hitchc. & Ekman +
1 (?) +  and 3 (?) +
keeled +  and rounded +
divergent +  and parallel +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
membranous +
disarticulating +  and pseudopetiolate +
non-radiate +  and radiate +
1 cm10 mm <br />0.01 m <br /> (30 cm300 mm <br />0.3 m <br />) +
pubescent +  and glabrous +
folded +, flat +  and linear +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
spikelike +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
not developed +
terete +  and compressed +
thick-walled +
sometimes longer +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Cypress-swamp panicum +
small green +
branched +  and simple +
compressed +
100 cm1,000 mm <br />1 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
succulent +
capillary +
germination +
pistillate +  and staminate +
sometimes longer +
compressed +  and terete +
shorter or longer +
subtending +
pubescent +  and glabrous +
tuberculate +
unequal +
membranous +
well-developed +
papillose-based +
uncinate +
Oval (?) +  and Round (?) +
bracteate +  and ebracteate +
hollow +  and solid +
coriaceous +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
membranous +
inconspicuous +
truncate +  and broadly triangular +
terrestrial +  and aquatic +
complex +  and simple +
concealed +  and prominent +
2 +  and 1 +
subterranean +
pyramidal +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
simple +  and compound +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
dry +  and fleshy +
pilose +  and glabrous +
not keeled +  and compressed +
in triplets +  and paired +
unisexual +  and bisexual +
pointed +, ellipsoid +  and lanceoloid +
0.2 cm2 mm <br />0.002 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
1 +  and 3 +
compound +  and simple +
fused +  and free +
2 +  and 3 +
dome--shaped +  and triangular +
Gramineae +
Panicum lacustre +
Panicum sect. Dichotomiflora +
species +
membranous +
stipitate +  and sessile +
7-veined +  and 5-veined +
pubescent +  and glabrous +
rugose +  and verrucose +
chartaceous-indurate +  and rigid +
7-veined +  and 5-veined +
dioecious +, monoecious +  and synoecious +