Conyza bonariensis (L.) Cronquist (Images by Gurcharan Singh & (Bhagyashri Ranade – Id by Vijayasankar Raman))

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Conyza canadensis (L.) Cronquist (Images by Gurcharan Singh , (NIdhan Singh – validation by Gurcharan Singh) & Prashant Awale)

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(Images by (Satish Phadke – validation by Nidhan Singh), Gurucharan Singh, Prashant Awale & Dinesh Valke

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Conyza sumatrensis (Retz.) E. Walker (Images by Gurcharan Singh & (Bhagyashri Ranade – Id by Gurcharan Singh)) 

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1a. Plants usually shorter than 50 cm; lateral branches equalling or overtopping main axis; heads 5-8 mm across; ray corolla shorter than 0.3 mm; fruiting head 8-10 mm across, pappus 3-4 mm long; lower leaves linear-lanceolate, upper linear……………….Conyza bonariensis
1b. Plants usually taller than 50 cm; lateral branches shorter than main axis; heads less than 6 mm across; lower leaves lanceolate or oblanceolate, upper linear-lanceolate….. (2)
2a. Ray corolla shorter than 0.3 mm; heads 4-6 mm across; fruiting head 7-8 mm across, pappus 3-4 mm long; lower leaves oblanceolate, upper linear-lanceolate; plants densely hairy, phyllaries short hairy…….Conyza sumatrensis
2b. Ray corolla 0.3-1 mm long; heads 2-4 mm across; fruiting head 5-6 mm across, pappus 2-3 mm long; leaves lanceolate; plants sparsely hairy; phyllaries with few long hairs………Conyza canadensis   

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Binomial Habit Notes Ref. Distrib.
Conyza aegyptiaca (L.) Ait.  Herb Dry Evergreen
to Dry Deciduous Forests
Flora of Tamil
Nadu, VOL. II, 1987
Coimbatore,
Dharmapuri, Nilgiri
Conyza bonariensis (L.) Cronquist Herb Plains
to  High Altitude, Naturalized, Native
of Tropical America
Flora
of Tamil Nadu, VOL. II, 1987
All
districts
Conyza japonica (Thunb.) Less. Herb Western
Ghats & Eastern Ghats, Moist Deciduous to
Evergreen Forests  
Flora
of Tamil Nadu, VOL. II, 1987
Coimbatore,
Dindigul, Nilgiri, Tiruchchira ppalli, Tirunelveli
Conyza leucantha (D.Don) Ludlow & Raven Herb Western
Ghats & Eastern Ghats, Moist Deciduous to
Evergreen Forests  
Flora
of Tamil Nadu, VOL. II, 1987; Gamble 1957, Matthew 1983
Coimbatore,  Dharmapuri, Nilgiri,  Salem, Tirunelveli
Conyza stricta Willd. Herb Western
Ghats & Eastern Ghats, Moist Deciduous to
Evergreen Forests
Flora
of Tamil Nadu, VOL. II, 1987; Matthew 1983
Coimbatore,
Dharmapuri, Dindigul, Nilgiri, Salem,
Theni, Virudhu nagar

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Conyza bonariensis Asteraceae Flaxleaf Fleabane
Conyza canadensis Asteraceae Canadian Horseweed
Conyza japonica Conyza veronicifolia, Conyza congesta, Blumea compactiflora Asteraceae Japanese Fleabane
Conyza leucantha Blumea leucantha, Erigeron leucanthum, Vernonia subsimplex Asteraceae White-Flowered Fleabane
Conyza stricta Asteraceae Erect Horseweed
Conyza sumatrensis Conyza floribunda, Erigeron albida Asteraceae Tall Fleabane


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An Excursion Flora of Central Tamilnadu, India By K. M. Matthew (1995- Details with Keys)-
Conyza leucantha (D.Don) Ludlow & Raven &
Conyza stricta

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Flora of Eastern Ghats: Hill Ranges of South East India, Volume 3 By T. Pullaiah, K. Sri Ramamurthy (2007- Details)-

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Flora of Davanagere District, Karnataka, India By B. K. Manjunatha, V. Krishna, T. Pullaiah (2004- Details with Keys)-
Conyza leucantha (D.Don) Ludlow & Raven &
Conyza stricta

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Conyza :  6 posts by 2 authors.
I have updated efi page on Conyza.
Attempts have been made to incorporate most of the species available in India & nearby areas with details & keys directly or through links.
Any comments are welcome.

If we are merging Conyza with Erigeron, there should be no Conyza page.
GRIN and Flora of China merge Conyza in Erigeron
The Plant List, Tropicos and Global Compositae List Treat them distinct and I would prefer following them

Thanks, …, What is the latest nomenclature ?

Is it as being followed by The Plant List or as being followed by GRIN ?


I would prefer keeping two separate.


Thanks, …, I have reverted back to Conyza sumatrensis


Funk, V. A. et al., eds. 2009. Systematics, evolution, and biogeography of Compositae. (Syst Evol Biog Comp) 611–612. ): recommend to treat Coynza as a synonym of Erigeron. This is likely to be followed.
As of now, GRIN restricts Conyza to a few African species (e.g., Madagascar species: Conyza ageratoides DC.).
As you know, GRIN and PLANTS List are taxonomic databases and rely upon recent molecular works.

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Pl. go through Conyza page (Asteraceae (Compositae)) with images of species in efloraofindia (done by Bhagyashri ji).

If you find any mis-identification, pl. let us know.
If anybody can send images of other species of this genera (for incorporation in the website), it will be really nice. Also, if anybody is interested to take up the activity of inserting images on efloraofindia pages from efloraofindia posts, pl. let us know.


 

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