Najas wrightiana

A. Braun

Sitzungsber. Ges. Naturf., Freunde Berlin. 1868:17. 1868.

WeedyIntroduced
Treatment appears in FNA Volume 22.

Stems profusely branched proximally to distally, 9–45 cm × 0.3–1 mm; internodes 0.3–5.2 cm, without prickes abaxially. Leaves ascending with age, 0.5–2.6 cm, stiff in age; sheath 0.7–2.8 mm wide, apex rounded; blade 0.2–1.3 mm wide, margins conspicuously serrulate, teeth 8–22 per side, apex acute, with 1 tooth, teeth multicellular; midvein without prickles abaxially. Flowers 1–2 per axil, staminate and pistillate on same plant. Staminate flowers in distal axils, 1.2–1.9 mm; involucral beaks 2-lobed, 0.3–0.5 mm; anther 4-loculed,1 mm. Pistillate flowers in proximal axils, 2 mm; styles to 0.7 mm; stigmas 4-lobed. Seeds not recurved, whitish, fusiform, 0.7–1.5 × 0.3–0.5 mm, apex with style situated at center; testa dull, 3 cell-layers thick, pitted; aeroleareoles regularly arranged in 20 longitudinal rows, not ladderlike, 4–5-angled, longer than broad, end walls raised. Chromosome number unknown not available.


Phenology: Flowering late spring–fall.
Habitat: Slow moving streams and ponds
Elevation: 0–100 m

Distribution

V22 191-distribution-map.jpg

Introduced; Fla., Mexico, Central America (Guatemala), Central America (Belize), Central America (Honduras), West Indies (Cuba)

Discussion

Lower Taxa

None.

"elongating" is not a number.

... more about "Najas wrightiana"
1 cm10 mm <br />0.01 m <br /> (?) +
acute +  and rounded +
Robert R. Haynes +
A. Braun +
involucral +
2-lobed +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
armed +  and 1-veined +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
sharp-tipped +
short-pedunculate +  and sessile +
Fla. +, Mexico +, Central America (Guatemala) +, Central America (Belize) +, Central America (Honduras) +  and West Indies (Cuba) +
0–100 m +
pistillate +  and staminate +
1 +  and 2 +
2 cm20 mm <br />0.02 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
Slow moving streams and ponds +
0.3 cm3 mm <br />0.003 m <br /> (5.2 cm52 mm <br />0.052 m <br />) +
light green +  and brown +
red-purple +  and purple +
whorled +, appearing +  and opposite +
submersed +
0.5 cm5 mm <br />0.005 m <br /> (2.6 cm26 mm <br />0.026 m <br />) +
serrate to minutely +
Flowering late spring–fall. +
not stipitate +
Sitzungsber. Ges. Naturf., Freunde Berlin. +
davenport1980a +  and les1995a +
longer than broad +
4-5-angled +  and not ladderlike +
auriculate +  and not auriculate +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
not recurved +
fusiform +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
not persisting +
variously--shaped +
0.7mm;2.8mm +
Weedy +  and Introduced +
9 cm90 mm <br />0.09 m <br /> (45 cm450 mm <br />0.45 m <br />) +
slender +
0.3mm;1mm +
2-4-branched +
0 cm0 mm <br />0 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
Najas wrightiana +
species +
multicellular +
caulescent +  and not rhizomatous +
perennial +  and annual +