Spilanthes calva DC (?) from Kamrup district (Rural), Assam

[Karuna Das]

Dear All,
Are the attached images Spilanthes calva DC ? Please confirm the ID.

Date :08/11/12
Location: Mirza [Dist- Kamrup(Rural)Assam]
Habitat: Grows on bank of pond
Habit :Herb
Family : Asteraceae
Genus & Species : Spilanthes calva DC (?)
Inflorescence : Large, Yellow in colour

With regards
Karuna Kanta Das
Guwahati 781012

Catch India as it happens with the Rediff News App. To download it for FREE, click here

[Gurcharan Singh]

Most species of Spilanthes have been transferred to Acmella, A. calva typically has discoid heads but radiate heads are also known. A. uliginosa looks very similar in leaves and heads but has tetramerous flowers. Pl. check this if you have close up of head.

    Achenes are very important for this genus.

-- 

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/ 

 

--
 
 
 

[jmgarg1]

Forwarding again for Id confirmation or otherwise please.

Some earlier relevant feedback:      

Most species of Spilanthes have been transferred to Acmella, A. calva typically has discoid heads but radiate heads are also known. A. uliginosa looks very similar in leaves and heads but has tetramerous flowers. Pl. check this if you have close up of head. Achenes are very important for this genus. -- Dr. Gurcharan Singh

--
 
 
 

--

With regards,
J.M.Garg

http://en.wikipedia.org/wiki/User:Jmgarg1

'Creating awareness of Indian Flora & Fauna'
The whole world uses my Image Resource of more than a thousand species & eight thousand images of Birds, Butterflies, Plants etc. (arranged alphabetically & place-wise): http://commons.wikimedia.org/wiki/Category:J.M.Garg. You can also use them for free as per Creative Commons license attached with each image.

For identification, learning, discussion & documentation of Indian Flora, please visit/ join our Efloraofindia Google e-group: http://groups.google.co.in/group/indiantreepix (more than 2000 members & 1,37,000 messages on 31/10/12) or Efloraofindia website: https://sites.google.com/site/efloraofindia/ (with a species database of more than 7500 species).

Also author of 'A Photoguide to the Birds of Kolkata & Common Birds of India'. 

[jmgarg1]

Forwarding again for Id confirmation or otherwise please.

Some earlier relevant feedback:

	Most species of Spilanthes have been transferred to Acmella, A. calva typically has discoid heads but radiate heads are also known. A. uliginosa looks very similar in leaves and heads but has tetramerous flowers. Pl. check this if you have close up of head. Achenes are very important for this genus. -- Dr. Gurcharan Singh

---------- Forwarded message ----------
From: Karuna Das <kd_...@rediffmail.com>
Date: 12 November 2012 22:24
Subject: [efloraofindia:138211] Spilanthes calva DC (?) from Kamrup district (Rural), Assam
To: indian...@googlegroups.com
Cc: kd_...@rediffmail.com

--
 
 
 

[Saroj Kumar Kasaju]

Acmella calva (DC.) R.K.Jansen looks close

Thank you

Saroj Kasaju

[J.M. Garg]

--
With regards,
J. M. Garg

--
You received this message because you are subscribed to the Google Groups "efloraofindia" group.
To unsubscribe from this group and stop receiving emails from it, send an email to indiantreepi...@googlegroups.com.
To view this discussion on the web, visit https://groups.google.com/d/msgid/indiantreepix/ab30e412-691d-436c-b28a-bde1a656c816n%40googlegroups.com.

[J.M. Garg]

Acmella calva (DC.) R.K.Jansen and  Acmella paniculata are very close and confusing.

Keys as per Acmella :

3a. Corolla white, greenish white or with purple tinge, 4-merous, pappus of 2-3 bristles …..Acmella radicans var. radicans

3b. Corolla pale yellow, yellow or orange yellow …(4)  

4a. Pappus absent; stems decumbent, rooting at nodes; leaves ovate, ahenes 1.7-2.2 mm, glabrous, if sparsely hairy then hairs hooked ….Acmella calva 

4b. Pappus of 2-3 bristles, achenes hairy, hairs straight, stems erect without nodal roots…..(5) 

5a. Mature achenes with cork-like margin; surface tuberculate …….Acmella paniculata

Flora of China gives:

4 (1)	Pappus absent; achenes glabrous.		2 A. calva
+	Pappus of 2 or 3 setae; achenes moderately to densely ciliate		(5)
5 (4)	Mature achenes with corklike margin.		5 A. paniculata

We have to decide between the two.

Going by images at research gate link, it appears more closer to A. paniculata. Stem does not appear to be decumbent with rooting at nodes. 

---------- Forwarded message ---------
From: Karuna Das <kd_...@rediffmail.com>
Date: Mon, 12 Nov 2012 at 22:24
Subject: [efloraofindia:138211] Spilanthes calva DC (?) from Kamrup district (Rural), Assam
To: <indian...@googlegroups.com>
Cc: <kd_...@rediffmail.com>

--
 
 
 

--

With regards,
J.M.Garg

[J.M. Garg]

On further review, I think it appears more closer to images and details at Acmella uliginosa

---------- Forwarded message ---------
From: Karuna Das <kd_...@rediffmail.com>
Date: Mon, 12 Nov 2012 at 22:24
Subject: [efloraofindia:138211] Spilanthes calva DC (?) from Kamrup district (Rural), Assam
To: <indian...@googlegroups.com>
Cc: <kd_...@rediffmail.com>

--
 
 
 

--

With regards,
J.M.Garg