Ludwigia curtissii

Chapman

Fl. South. U.S. ed. 2, 621. 1883.

Common names: Curtiss’s primrose-willow
Synonyms: Ludwigia spathulifolia Small
Treatment appears in FNA Volume 10.
Revision as of 20:01, 7 June 2022 by imported>Volume Importer
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Herbs rarely creeping and rooting at nodes, stolons usu­ally absent. Stems erect or ascending at base, very rarely prostrate, unbranched to well branched, branches sometimes very slender, 15–75 cm, gla­brous, with slightly raised lines decurrent from leaf-axils. Leaves alternate; stipules reddish purple, narrowly ovate, 0.2–0.3 × 0.1–0.3 mm, succulent; petiole winged, 0.3–1.2 cm, blade usually oblanceolate-spatulate to spatulate or oblanceolate, rarely sublinear, 1–2.5 (–3) × 0.1–0.8 cm, base attenuate, margins subentire with hydathodal glands, apex acute or mucronate, surfaces glabrous; bracts not reduced. Inflorescences usually not congested, leafy racemes or spikes, flowers solitary in leaf-axils; bracteoles attached in opposite pairs near base of ovary, narrowly lanceolate, lanceolate-elliptic, or oblong-linear, 1.5–3.5 (–4) × 0.4–0.8 mm, swollen at base, apex acuminate. Flowers: sepals ascending, green fading to white near base, ovate-deltate, 1.5–3 × 1.2–2 mm, margins entire, apex narrowly acute or acuminate, surfaces glabrous; petals 0 (–3), narrowly elliptic or spatulate, 1–2.5 × 0.5–1 mm, base attenuate, apex obtuse; filaments pale-yellow, 0.8–1 (–1.3) mm, anthers 0.3–0.6 × 0.3–0.5 mm; pollen shed singly; ovary obovate-obpyramidal, 2–2.5 × 1.8–2.3 mm, glabrous; nectary disc elevated 0.3–0.4 mm on ovary apex, green, 0.9–1.6 mm diam., prominently 4-lobed, glabrous; style pale green, 0.4–0.7 mm, glabrous, stigma pale-yellow, subglobose, 0.3–0.4 × 0.2–0.4 mm, not exserted beyond anthers. Capsules obconic, obscurely 4-angled, (2–) 2.5–4 (–4.7) × 2–3 (–3.5) mm, hard-walled, dehiscent by loculicidal slits, pedicel 0.1–0.5 mm. Seeds light-brown, ellipsoid, 0.4–0.6 × 0.3–0.4 mm, surface cells transversely elongate, glabrous or, sometimes, with surface wax that mimics appressed hairs. 2n = 64.


Phenology: Flowering Mar–Nov (year-round).
Habitat: Pine savannas and flatwoods, marshes, edges of ponds and streams, sandy or peaty swales, limestone prairies, solution pits on limestone.
Elevation: 0–50 m.

Distribution

Fla., West Indies (Bahamas)

Discussion

Ludwigia curtissii is the only octoploid (n = 32) in sect. Isnardia, and is restricted to peninsular Florida and the Bahamas. It and L. simpsonii they are the only members of the section that do not form true stolons; instead they simply sprout new shoots from the base. The two species are similar in many ways and appear to share three genomes (C. I. Peng 1988).

Selected References

None.

Lower Taxa

None.
... more about "Ludwigia curtissii"
3(-5)-aperturate +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
obtuse +, acuminate +, acute +  and mucronate +
Peter C. Hoch +
Chapman +
attenuate +
Isnardia +
indehiscent +  and loculicidal +
2.5 cm25 mm <br />0.025 m <br /> (3 cm30 mm <br />0.03 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
lobed +, toothed +  and entire +
sublinear +, usually oblanceolate-spatulate +  and spatulate or oblanceolate +
reduced +
0.1 cm1 mm <br />0.001 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
not reduced +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
dark red +  and black +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
swollen +  and lanceolate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
slender +
15 cm150 mm <br />0.15 m <br /> (75 cm750 mm <br />0.75 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.47 cm4.7 mm <br />0.0047 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
straight +  and slightly curved +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
spreading +  and erect +
4-angled +  and obconic +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Curtiss’s primrose-willow +
Fla. +  and West Indies (Bahamas) +
0–50 m. +
0.1 cm1 mm <br />0.001 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
basifixed +  and versatile +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
long-pedicellate +  and subsessile +
straight +  and slightly curved +
by a terminal pore +  and dehiscent +
spreading +  and erect +
cylindric +  and clavate turbinate obpyramidal or globose +
Pine savannas and flatwoods, marshes, edges of ponds and streams, sandy or peaty swales, limestone prairies, solution pits on limestone. +
perennial +
glandular-puberulent +, hirtellous +, villous +  and strigillose +
deciduous +
decurrent +
subentire +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
obovate-obpyramidal +
1.8mm +  and 2.3mm +
numerous +  and 1 +
submerged +
swollen +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
1mm +  and 2.5mm +
5 +  and 4 +
spatulate +  and elliptic +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Flowering Mar–Nov (year-round). +
Fl. South. U.S. ed. +
paired +, solitary +  and cluster +
ascending +, decumbent +  and erect +
inconspicuous +
expanded +
basal +  and cauline +
clavate +  and globose +
light-brown +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
50 +  and 400 +
pitted +  and smooth +
ellipsoid +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
green fading +  and white +
persistent +
post-anthesis +
5 +  and 4 +
ovate-deltate +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
parenchymatous +
parietal +, axile +  and placentation +
2 +  and 1 +
unequal +  and subequal +
2 times as many as sepals +
aquatic +, amphibious +  and terrestrial +
loculicidal +
lenticular +
2 times as many as sepals +
branched +  and unbranched to well +
ascending +  and erect +
ridged +, subterete +  and terete +
pale-yellow +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
subglobose +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
sessile +  and petiolate +
reddish purple +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
intrapetiolar +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
aquatic +, amphibious +  and terrestrial +
, +  and glabrous +
papillate +
Ludwigia spathulifolia +
Ludwigia curtissii +
Ludwigia sect. Isnardia +
species +
3(-5)-aperturate +