Ludwigia


 
The Genus Ludwigia (Onagraceae) in India by I.C. Barua- Rheedea Vol. 20 (1) 59-70 2010 (pdf available in this efi thread)-
Abstract- The genus Ludwigia L. consists of seven species and one infraspecific taxon in India, of which L. decurrens forms the first report for India. This revision provides a key to species, descriptions and illustrations along with data on phenology, distribution and notes on ecology. 
List as below:
Ludwigia adscendens (L.) H. Hara
Ludwigia decurrens Walt.
Ludwigia linifolia (Vahl) R.S. Rao (syn: Ludwigia hyssopifolia (G. Don) Exell)
Ludwigia octovalvis (Jacq.) Raven 
   Ludwigia octovalvis (Jacq.) Raven subsp. octovalvis 
   Ludwigia octovalvis (Jacq.) Raven subsp. sessiliflora (Mich.) Raven 
Ludwigia perennis L. 
Ludwigia peruviana (L.) H. Hara 
Ludwigia prostrata Roxb.

Key to the species
1. Plants prostrate; adventitious roots present; leaves rounded or subacute at apex; flowers 5-merous; petals white ………...............….. L. adscendens
1. Plants erect or semi-erect; adventitious roots absent; leaves acute or acuminate at apex; flowers 4-(rarely 5)-merous; petals yellow....2
2. Stems and leaves pubescent to villous ………...............................................3
2. Stems and leaves glabrous or puberulous .................................................... 4
3. Capsules terete; raphe nearly equal to seed …..... .............…........................L. octovalvis
3. Capsules 4-angled; raphe much smaller than seed ………........................… L. peruviana
4. Stems woody below; stamens 8; ovary glabrous ……….............……………. 5
4. Stems herbaceous throughout; stamens 4; ovary puberulous or pubescent...6
5. Flowers 1.5 – 2 cm across; capsules 4-angular ………………..................….. L. decurrens
5. Flowers under 1 cm across; capsules terete ………..……….......................... L. linifolia
6. Stems winged, well-branched; capsules 4-angular; seeds uniseriate ............ L. prostrata
6. Stems not winged, scarcely branched; capsules terete; seeds pluriseriate.... L. perennis



Ludwigia adscendens (L.) H. Hara
 
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Binomial Habit Notes References Distribution
Ludwigia adscendens (L.) Hara HerbPlains, AquaticFlora of Tamil Nadu, VOL. I, 1983All districts
Ludwigia hyssopifolia (G. Don) ExellShrubPlains, Marsh Localities Flora of Tamil Nadu, VOL. I, 1983; Matthew, 1983Coimbatore, Cuddalore, Madurai, Nilgiri, Salem, Tirunelveli, Tiruchchirappalli, Tiruvannamalai, Vellore,  Viluppuram
Ludwigia octovalvis (Jacq.) Raven subsp. sessiliflora (Mich.) RavenHerbMid to  High Altitude, Marsh Localities Flora of Tamil Nadu, VOL. I, 1983; Matthew, 1983Coimbatore, Dharmapuri, Dindigul,   Nilgiri,  Salem, Theni,  Tiruchchirappalli, Tiruvannamalai, Viluppuram
Ludwigia perennis L.HerbPlains to Low Altitude, Marsh Localities Flora of Tamil Nadu, VOL. I, 1983All districts
Ludwigia peruviana (L.) HaraShrubPlains, AquaticFlora of Tamil Nadu, VOL. I, 1983Coimbatore, Dharmapuri, Nilgiri, Salem
Ludwigia prostrasta Roxb.HerbPlains, Marsh LocalitiesFlora of Tamil Nadu, VOL. I, 1983; Raven, 1963Coimbatore

  

 
 
Botanical nameSynonymsFamilyCommon name
Ludwigia adscendens Jussiaea repens, Jussiaea adscendens Onagraceae Water Primrose
Ludwigia hyssopifolia Jussiaea hyssopifolia, Ludwigia micrantha Onagraceae Hyssop-Leaved Water Primrose
Ludwigia octovalvis Ludwigia octovalvis subsp. sessiliflora, Ludwigia angustifolia Onagraceae Willow Primrose
Ludwigia perennis Ludwigia parviflora, Ludwigia multiflora, Ludwigia caryophyllea Onagraceae Perennial Water Primrose
Ludwigia sedioides Jussiaea sedoides Onagraceae Mosaic Flower

 
 
 
 
Forest Plants of Eastern India By Amal Bhusan Chaudhuri (1993)-
 
Flora of Davanagere District, Karnataka, India By B. K. Manjunatha, V. Krishna, T. Pullaiah (2004)- Details with keys-
 
An Excursion Flora of Central Tamilnadu, India By K. M. Matthew (1995)- Details with keys-
 
Flora of Medak District, Andhra Pradesh, India By T. Pullaiah, Chintala Prabhakar, B. Ravi Prasad Rao (1998)- Details with keys-
 
Flora of Ranga Reddi District Andhra Pradesh, India By T. Pullaiah, M. Silar Mohammed (2000)- Details with keys-
 
Flora of Eastern Ghats: Hill Ranges of South East India, Volume 3 By T. Pullaiah, K. Sri Ramamurthy (2007)- Details-
 
 
Encyclopaedia of world medicinal plants, Volume 1 By T. Pullaiah (2006)- Details-
 
Flora of Madhya Pradesh: Chhatarpur and Damoh By G. P. Roy, B. K. Shukla, Bhaskar Datt (1992)-Details with keys-
 
Ludwigia (Onagraceae) : 1 post by 1 author.

I have updated eFI (efloraofindia) page on Ludwigia (Pl. click).

Attempts have been made to incorporate most of the species available in India & nearby areas with details & keys directly or through links as far as possible. It’s quite possible that there may be some discrepancy in the accepted names & synonyms taken from other links.

Species discussed so far in efloraofindia are given at the bottom of the page in the form of links against Subpages. On clicking them one can see all the details.

If someone can provide complete list of Indian species with source references it will be wonderful.

Any comments/ corrections are welcome.


 

Pl. go through Ludwigia ‎(Onagraceae‎‎) page with images of species in efloraofindia.

If you find any incorrect identification, pl. let us know. If anybody can send images of other species of this genera (for incorporation in the website), if any, or can identify unidentified images, it will be really nice.