Asteraceae Fortnight Part 2-Discoid heads: Pluchea lanceolata from Delhi-GS11

[Gurcharan Singh]

Pluchea lanceolata (DC.) C. B. Clarke

Syn: Berthelotia lanceolata DC.

Photographed from Delhi.

While trying to identify species of Pluchea in India we must be looking at least at seven names. The two species earlier 

considered distinct with winged stem due to decurrent leaf bases (P. ovalis) or without winged stems but distinctly auricled

leaf bases (P. tomentosa) have now been merged into one P. ovalis. 

1. Heads solitary or few, 8-12 mm across,  not in corymbs; involucre bracts 

    subulate-lanceolate, rigid.................................................................................P. arguta Boiss.

1. Heads many in compound corymbs, less than 8 mm across; outer involucre 

   bracts not rigid.................................................................................................(2)     

2. Leaves sessile, decurrent on stem (to make it winged) or auricled at base; outer

    involucre bracts acute.........................................................................................P. ovalis DC.

2. Leaves sessile or subsessile, neither auricled at base, nor decurrent on stem........(3)

3. Plants of salt marshes; leaves subsessile, obovate or oblanceolate, subserrate, 

    often gland-dotted; outer involucre bracts rounded at tip; disc florets less than 7;

    pappus white......................................................................................................P. indica Less.

3. Plants terrestrial; leaves not gland-dotted; disc florets more than 10.......................(4)   

4. Leaves 12-20 cm long, linear with recurved margin, nerves obscure..........................P. linearifolia Cl.

4. Leaves shorter than 10 cm long, not linear, flat, nerves distinct................................(5)

5. Tall shrub up to 2 m tall; leaves elliptic to obovate-oblong, faintly toothed, tips

    not pungent; outer involucre bracts ovate, acute....................................................P. wallichiana DC.

5. Low shrub mostly less than 1 m tall; leaves oblong to oblanceolate, mostly 

    entire, tip mucronate and pungent; outer involucre bracts oblong, obtuse, 

    purple at tip.......................................................................................................P. lanceolata (DC.) Cl.

   

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Dr. Gurcharan Singh

Retired  Associate Professor
SGTB Khalsa College, University of Delhi, Delhi-110007
Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018.
Phone: 011-25518297  Mob: 9810359089

http://www.gurcharanfamily.com/ 
http://people.du.ac.in/~singhg45/

[D.S Rawat]

Conyza paniculata Willd. is now Pluchea paniculata (Willd.) Karthik and Moorthy; which makes it another species in this genus.

DSRawat Pantnagar

[Ushadi Micromini]

Key words for easy retrieval later on  by non botanists including me :
pluchea key Gurcharan Singh


usha di

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Usha di
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[J.M. Garg]

Thanks, Singh ji.

I have made changes accordingly.

If we follow Global Compositae Checklist, then in India we have only Pluchea tomentosa & no Pluchea ovalis as per the following links:

http://dixon.iplantcollaborative.org/CompositaeWeb/default.aspx?Page=NameDetails&TabNum=0&NameId=2af40355-415c-4fab-95ff-43186bbc20dc (Pluchea tomentosa)

http://dixon.iplantcollaborative.org/CompositaeWeb/default.aspx?Page=NameDetails&TabNum=0&NameId=58d3e6a0-b0fd-4118-b13a-9436feb09435 (Pluchea ovalis)

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J.M.Garg

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[J.M. Garg]

Hi, Rawat ji.

As per GCC, there are two species of Conyza paniculata

Conyza paniculata Synonym of Blumea axillaris (Lam.) DC. &

Conyza paniculata Desf. Synonym of Conyza fastigiata Willd. (only this one in The Plant List Ver 1.1)

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[D.S Rawat]

Garg Ji

Karthikeyan et al.(2009) shifted a species (originally published as Conyza paniculata Willd.) to Pluchea genus but this was not accepted by GCC. Rather, GCC accept the shifting of this species to Blumea genus by M.R.Almeida in 2001 thus making it as Blumea paniculata (Willd.) M.R.Almeida. TPL 2013 also accepts the same shifting.

Obviously Pluchea paniculata (Willd.) is not an accepted species in this genus.

DSRawat Pantnagar

Dr D.S.Rawat

Department of Biological Sciences, G.B. Pant University of Agriculture & Technology Pantnagar-263 145 Uttarakhand, INDIA

[amitsetiya09]

Hello Sir

Happy to see Pluchea lanceolata growing wild and that too as a weed. As per our study in central India, it has been estimated as near threatened. For further study, we need seeds of these plant and some exact GPS locations. So, asking for the help herewith. 

Your reply is solicited!

Regards

amit..

Amit Vijay Setiya

Department of Botany,

Government Science College, Gadchiorli. M.S. India

9422153515