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
Species with description & pictures in Flowers of India as on 2.1.14:
Species with distribution in annotated checklist of Flowering plants of Nepal :
Conyza bonariensis (L.) Cronquist
Conyza canadensis (L.) Cronquist
Conyza japonica (Thunb.) Less. ex DC.
Conyza leucantha (D. Don) Ludlow & Raven
Conyza stricta Willd.
Conyza stricta var. pinnatifida (D. Don) Kitam.
Conyza stricta var. stricta Willd.
Conyza sumatrensis (Retz.) E. Walker
An Excursion Flora of Central Tamilnadu, India By K. M. Matthew (1995- Details with Keys)-
Flora of Eastern Ghats: Hill Ranges of South East India, Volume 3 By T. Pullaiah, K. Sri Ramamurthy (2007- Details)-
Flora of Davanagere District, Karnataka, India By B. K. Manjunatha, V. Krishna, T. Pullaiah (2004- Details with Keys)-
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.
Conyza page (Asteraceae (Compositae)) with images of species in efloraofindia : 1 post by 1 author.
If you find any mis-identification, pl. let us know.