Contains 30 accepted taxa overall.
Characteristics
Classification
Citation
LUDWIGIA Linnaeus, Sp. Pl. 188. 1753 (Ludvigia); corr. Linnaeus, Gen. Pl., ed. 5. 55. 1754.
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TYPE: Ludwigia alternifolia Linnaeus Lectotypified by Britton & A. Brown, Ill. Fl. N. U.S., ed. 2. 2: 586. 1913.
Species
| Scientific Name | Common Name | Herbarium Specimens | Status | Photos |
|---|---|---|---|---|
| Ludwigia alata | WINGED PRIMROSEWILLOW | Native OBL (NWPL) OBL (DEP) | ||
| Ludwigia alternifolia | SEEDBOX | Native OBL (NWPL) OBL (DEP) | ||
| Ludwigia arcuata | PIEDMONT PRIMROSEWILLOW | Native OBL (NWPL) OBL (DEP) | ||
| Ludwigia bonariensis | CAROLINA PRIMROSEWILLOW | Not Native OBL (NWPL) OBL (DEP) | ||
| Ludwigia brevipes | LONG BEACH PRIMROSEWILLOW | Native OBL (NWPL) | ||
| Ludwigia curtissii | CURTISS' PRIMROSEWILLOW | Native OBL (NWPL) OBL (DEP) | ||
| Ludwigia decurrens | WINGLEAF PRIMROSEWILLOW | Native OBL (NWPL) OBL (DEP) | ||
| Ludwigia erecta | YERBA DE JICOTEA | Native OBL (NWPL) OBL (DEP) | ||
| Ludwigia glandulosa | CYLINDRICFRUIT PRIMROSEWILLOW | Native OBL (NWPL) OBL (DEP) | ||
| Ludwigia grandiflora | LARGEFLOWER PRIMROSEWILLOW | Not Native OBL (NWPL) OBL (DEP) | ||
| Ludwigia hirtella | SPINDLEROOT | Native FACW (NWPL) FACW (DEP) | ||
| Ludwigia lanceolata | LANCELEAF PRIMROSEWILLOW | Native OBL (NWPL) OBL (DEP) | ||
| Ludwigia leptocarpa | ANGLESTEM PRIMROSEWILLOW | Native OBL (NWPL) OBL (DEP) | ||
| Ludwigia linearis | NARROWLEAF PRIMROSEWILLOW | Native OBL (NWPL) OBL (DEP) | ||
| Ludwigia linifolia | SOUTHEASTERN PRIMROSEWILLOW | Native OBL (NWPL) OBL (DEP) | ||
| Ludwigia longifolia | LONGLEAF PRIMROSEWILLOW | Not Native OBL (DEP) | ||
| Ludwigia maritima | SEASIDE PRIMROSEWILLOW | Native FACW (NWPL) FACW (DEP) | ||
| Ludwigia microcarpa | SMALLFRUIT PRIMROSEWILLOW | Native OBL (NWPL) OBL (DEP) | ||
| Ludwigia octovalvis | MEXICAN PRIMROSEWILLOW | Native OBL (NWPL) OBL (DEP) | ||
| Ludwigia palustris | MARSH SEEDBOX | Native OBL (NWPL) OBL (DEP) | ||
| Ludwigia peploides subsp. glabrescens | FLOATING PRIMROSEWILLOW | Native OBL (NWPL) OBL (DEP) | ||
| Ludwigia peruviana | PERUVIAN PRIMROSEWILLOW | Not Native FACW (NWPL) Y OD (WAP) OBL (DEP) | ||
| Ludwigia pilosa | HAIRY PRIMROSEWILLOW | Native OBL (NWPL) OBL (DEP) | ||
| Ludwigia ravenii | RAVEN'S PRIMROSEWILLOW | Native OBL (DEP) | ||
| Ludwigia repens | CREEPING PRIMROSEWILLOW | Native OBL (NWPL) OBL (DEP) | ||
| Ludwigia spathulata | SPOON PRIMROSEWILLOW | Native OBL (NWPL) OBL (DEP) | ||
| Ludwigia sphaerocarpa | GLOBEFRUIT PRIMROSEWILLOW | Native OBL (NWPL) OBL (DEP) | ||
| Ludwigia suffruticosa | SHRUBBY PRIMROSEWILLOW | Native OBL (NWPL) FACW (DEP) | ||
| Ludwigia virgata | SAVANNAH PRIMROSEWILLOW | Native OBL (NWPL) FACW (DEP) | ||
| Ludwigia x simulata | Native OBL (DEP) |
Identification Key
1. Leaves opposite
1. Leaves alternate
2
2. Stamens 4-5 per flower, as many as the sepals
2. Stamens 8-10 per flower, twice the number of sepals
3
3. Sepals 5(-7)
3. Sepals 4
1. (Key A) Pedicels 6-45 mm long
2
1. Pedicels 0-2(-5) mm long
3
2. Pedicel mostly subequal to shorter than the subtending leaf; petals 4-5 mm long
2. Pedicel usually much longer than the subtending leaf; petals 7-11 mm long
3. Plant densely strigulose
3. Plant glabrate
4
4. Sepals 1-2.1 mm long; petals absent; anthers 0.2-0.4 mm long, the pollen shed as monads; faces of fruit with a longitudinal band or obscure line running down from the sepal midrib, the appearing dissimilar from the corners
4. Sepals 1.8-5 mm long; petals present but often quickly deciduous; anthers 0.4-0.9 mm long, the pollen sheds as tetrads; fruit faces and corners similar in appearance
1. (Key B) Fruit much longer than wide
2
1. Fruit about as long as wide
4
2. Leaf blades elliptic, lanceolate, ovate, to oblanceolate, larger ones 4-12 mm wide; petals absent; fruit with a groove descending from the middle of the calyx lobe
2. Leaf blades linear to linear-oblanceolate, larger ones 1-4 mm wide; petals present; fruit without a groove
3
3. Calyx lobes 2-3 mm long, much shorter than the quadrangular fruit
3. Calyx lobes 5-6 mm long, ca. 0.6-1 times longer than the subcylindric fruit
4. Pedicel apparent, 3-20 mm long
5
4. Pedicel scarcely evident, 0-2 mm long
8
5. Leaf blade base cuneate-attenuate
5. Leaf blade base rounded to obtuse
6
6. Proximal leaf blades glabrous; style 7-10 mm long, longer than the sepals
6. Proximal leaf blades pubescent; styles to 3 mm long, shorter than the sepals
7
7. Plant hirsute
7. Plant pubescent to puberulent
8. Flowers several in a densely congested in a terminal spike with bract-like leaves
8. Flowers mostly separated along a leafy racemes or interrupted spike, or few in a congested, bracteate terminal spike
9
9. Plant hirtellous
10
9. Plant glabrous to strigillose
11
10. Sepals whitish along the upper surface and often tinged pink along the midvein and edge, the apex long-acuminate to subcuspidate and reflexed; anther 0.6-1.3 mm long, filament 0.7-1.1 mm long; style glabrous, 0.25-0.5 mm long; nectary disc hirtellous between the lobes
10. Sepals greenish on the upper surface, the apex acuminate and ascending; anther ca. 0.3 mm long, filament 1.5-2.5 mm long; style hirtellous, 1-2 mm long; nectary disc glabrous
11. Capsule quadrangular or winged
12
11. Capsule not angular, not winged
13
12. Stem usually ridged or winged; sepals whitish and subequal to the fruit
12. Stems usually smooth to obscurely ridged; sepals greenish, ca. ½ as long as the fruit
13. Sepals 1-2 mm long; fruit 1-1.5 mm long; seeds reddish brown
13. Sepals 2-4 mm long; fruit 1.5-7 mm long; seeds tan to yellowish
14
14. Leaf blades obovate, spatulate, to oblanceolate
14. Leaf blades linear-lanceolate to oblong-elliptic
1. (Key C) Stems prostrate to decumbent, rooting
2
1. Stems erect to ascending, not rooting at least distally
3
2. Bracteoles below hypanthium lanceolate; hypanthium subequal to shorter than the sepals
2. Bracteoles below hypanthium deltoid to ovate; hypanthium longer than the sepals
3. Fruit cylindric, 3-5 cm long (much longer than the pedicel), 2-4 mm wide
3. Fruit obconic, quadrangular, 1-3 cm long (subequal to the pedicel), 5-10 mm wide
1. (Key D) Stem conspicuously 4-winged
2
1. Stem without wings or slightly ridged on the angles
3
2. Leaf blades lanceolate, ovate-lanceolate, to elliptic
2. Leaf blades linear-lanceolate
3. Stems hirsute to villous
4
3. Stems glabrate
5
4. Fruit more than twice as long as the sepals, with a distinct ridge descending from the sepal midvein
4. Fruit subequal to slightly longer than the sepals, without a ridge continuous with the sepal midvein
5. Calyx lobes 3-4 mm long; petals 4-5 mm long
5. Calyx lobes (5-)10-15 mm long; petals (10-)15-30 mm long
6
6. Pedicel shorter than the hypanthium; hypanthium subequal to slightly longer than the sepals
6. Pedicel longer than the hypanthium; hypanthium more than twice as long as the sepals
Genus Synonyms
| Synonym | Full Citation | Basionym | Type |
|---|---|---|---|
| Adenola | Adenola Rafinesque, Autik. Bot. 36. 1840. | TYPE: Adenola grandiflora (Michaux) Rafinesque 1840. (Jussiaea grandiflora Michaux 1803.) Typified by Pennell, Bull. Torrey Bot. Club 48: 93. 1921. | |
| Corynostigma | Corynostigma C. Presl, Epimel. Bot. 218. 1851. | TYPE: Corynostigma jussiaeoides C. Presl | |
| Cubospermum | Cubospermum Loureiro, Fl. Cochinch. 258, 275. 1790. | TYPE: Cubospermum palustre Loureiro | |
| Dantia | Dantia Boehmer, in Ludwig, Def. Gen. Pl., ed. 3. 388. 1760. | TYPE: = Isnardia Linnaeus 1753. | |
| Diplandra | Diplandra Rafinesque, Autik. Bot. 35. 1840, non Bertero 1829, nec Hooker & Arnott 1838. | TYPE: Diplandra decurrens (Walter) Rafinesque (Ludwigia decurrens Walter) Lectotypified by Pennell, Bull. Torrey Bot. Club 48: 92. 1921. | |
| Isnardia | Isnardia Linnaeus, Sp. Pl. 120. 1753. | TYPE: Isnardia palustris Linnaeus | |
| Jussia | Adanson, Fam. Pl. 2: 85, 565. 1763. | TYPE: = Jussiaea Linnaeus 1753. | |
| Jussiaea | Jussiaea Linnaeus, Sp. Pl. 388. 1753. | TYPE: Jussiaea repens Linnaeus Lectotypified by Britton & A. Brown, Ill. Fl. N. U.S., ed. 2. 2: 589. 1913. | |
| Ludwigiantha | Ludwigiantha (Torrey & A. Gray) Small, Bull. Torrey Bot. Club 24: 178. 1897. | BASIONYM: Ludwigia Linnaeus, sect. Ludwigiantha Torrey & A. Gray, Fl. N. Amer. 1: 526. 1840. | TYPE: Lidwigiantha arcuata (Walter) Small (Ludwigia arcuata Walter) |
| Nematopyxis | Nematopyxis Miquel, Fl. Ned. Ind. 1(1): 626, 630. 1856 ("1855"). | TYPE: Non designatus. | |
| Oocarpon | Oocarpon Micheli, Flora 57: 303. 1874. | TYPE: Oocarpon jussiaeoides Micheli (Jussiaea oocarpa C. Wright ex Grisebach) | |
| Prieurea | Preiurea de Candolle, Prodr. 3: 58. 1828. | TYPE: Prieurea senegalensis de Candolle | |
| Quadricosta | Quadricosta Dulac, Fl. Hautes-Pyrénées 329. 1867. | TYPE: = Isnardia Linnaeus 1753. | |
| Tiphogeton | Tiphogeton Ehrhart, Beitr. Naturk. 4: 146. 1789. | TYPE: Isnardia palustris Linnaeus 1753. = Isnardia Linnaeus 1753. |