Commelina diffusa ?;


Identification : 27 posts by 8 authors. Attachments (2)

Kindly identify this plant.
Date/Time- 10 SEP 2019
Location-Place, Altitude, GPS-  Savandurga Hill, Karnataka 562201, 12° 55′ 0.30” N 77° 17′ 56.36” E. Altitude 861
Habitat- Garden/ Urban/ Wild/ Type- Wild
Plant Habit-Tree/ Shrub/ Climber/ Herb- Herb
Height/Length- 30 cm.
Flower – Blue. Three petals, Two larger petals with claw.
Is this Commelina diffusa?

Properly oriented photos needed of flower front and side, spathe top and side, leaf, hairs on various parts and habit.
It is a commelina, C. diffusa or C. caroliniana ……best differentiating character is testa foveolate or reticulate and it will take time before seeds mature and dry.

Agree with …!

Very well presented with all the necessary details.  I think all of us should follow the format By …

written the request well but as … asked… pictures need more info

Which to follow? … ?? Confused !

All comments are complementing each other, highlighting what is required in the process of identification.

In practical examination at MBBS and above, we have cases of spot diagnosis where …..just look and tell. Fast. Then there are short cases where minimum of examination will reveal diagnosis. We had to look at slides under microscope , xrays etc with classical diagnostic features we had to identify. Then there is long case which we had to take history, do a thorough physical examination, come to a tentative diagnosis or set of diagnoses, and then we were grilled in discussion, proving or disproving them, or how to approach, which investigations to do, what we expected to find out.

The business of plant identification I find no different.
Some identifications will be quick, one look and bingo ! Some will need a little exploration, and some will need thorough examination, at times with a microscope.
We all are practising this, knowingly or unknowingly.
Vinay ji has provided good relevant data regarding habitat and plant.
Pictorial documentation needs be more elaborate yet specific, and it comes only by going through the key of given genus again and again.

Yes …!

I think … was referring to the write up. with DatE TIME LOCATION Habitai plant location etc in the original request. … was refering to what need to show in pics and … was referring to … writing of the original request where he ga all the prescribed information about the plant in question. its really simple and strait-forfarwad
Vinay followed the guidelines to the T
no confusion. I hope this makes it clear?

while I was typing the long paragraph above. … explained it. it should be quite clear now.

Well said … Coincidentally they have spoken what is in my mind. What is needed is a combination of both visual and text presentation to help the experts to ID the plant. I myself lack this quality & would like to improve in my future postings. Of course, It is easier said than done as old habits die hard !

its simple, …
you go to this url page
copy the format and paste in your submission (each time).
or make a format form in your word file and keep it handy

Done !

Thanks a lot.  I will definitely follow your guidelines in my future postings..

that’s good

Good … now if you could at your convenience make a table for differential diagnosis for all the species of acalypha in india?
based on your wonderfully detailed and some newer (or not published) observations that you tld us about?
take your time. no rush. but  a tabulation would help\ or a flow chart

…, all the species !!! Noooo !!! That will be a tall order for which neither I am qualified, nor capable.

Two and half years back I shifted to Surat city from outskirts and all I see now a days is Acalypha indica growing wild.
Of course, there are ornamental species more prevalent in private collections, like A. wilkesiana , A. hispida etc …….
they do not require any key. Four species of Acalypha ”I think I recognise” ……..indica. malabarica, lanceolata and ciliata…..
growing wild in Rural Surat I did record 4-5 years back,
and I have shared my images with key character in another thread. Whether I am right in my assumption or not, experts will tell.
I must disclose that my approach is hands-on rather than scientific, and  whatever plants I recognise  are mostly by visual cue, I bring in science later .
At times I have difficulty putting it to words what I see and feel. Learning slowly, being hopeful.
ThanQ for inspiring us novices, showing confidence in me !

whats in your experience is what I was referring to

I think it may not be possible to id, based on these images, except for experts on this genus.

It is very difficult to ID with these pictures, rightly suggested perhaps as C. diffusa.

It seems to be an Commelina communis

Catalogue of Life mentions three species with this name.

It certainly is not Commelina communis, since odd petal is pretty big and concolorous. I read about it, wikipedia says it is distributed in India too ……..I wonder why it is not represented in EFI or FOI !

Catalogue of Life mentions four species with this name.
Only Commelina communis Engelm. ex Kunth, nom. illeg. ambiguous synonym for Commelina diffusa subsp. diffusa is distributed in India.

Sir, Let us ask … about this confusion. To me, presence or absence of prominent concolorous odd petal seems an important character.

Commelina diffusa is often misidentified as C. caroliniana and with C. communis L., as they shares similar habit. Also called C. nudiflora, frequently.
You will also find C. communis Vell. (non L.) in synonymy of C. diffusa.
All the mentioned species has distinct elliptic to orbicular medial petal, which is inconspicuous (or rarely absent) in some Commelina species. For the precise identification I’ll prefer spathe and capsule characters, which is missing in the posted picture, therefore tentative ID can be made which is more close to C. diffusa.

21st July, 2009: CEC Land, South Gate, Sanjay Gandhi National Park, Mumbai; Gandologi – Commelina diffusa – indiantreepix | Google Groups


MS/ID/DEC/2020/2- ID of the plant: 6 images.
I request the members to kindly help me to ID the  herb.  Photographs are attached herewith.

Pl. check comparative images at Commelina

Check with ensifolia

It’s either Commelina diffusa or Commelina caroliniana. Not ensifolia, as it has free spathe!