Citrus japonica from Delhi-GS29102025-1

[Gurcharan Singh]

Citrus japonica Thunb., Nova Acta Regiae Soc. Sci. Upsal., ser. 2, 3: 208 (1780)

Syn: Citrus madurensis Lour., Citrus x aurantium subsp. japonica (Thunb.) Engl. 

  Common Name: Round Kumquat, 

Small shrub or small tree barely 2-3 m tall. Leaves  with very narrowly winged petiole less than 1 cm long, obovate, elliptic to broadly ovate, obtuse with crenulate margin. Flower usually solitary or up to 3 in a fascicle, subsessile, petals about 5 mm long, fruit usually less than 3 cm, globose with thin rind, 4-6 chambered, orange yellow when ripe.

Clicked from Vikas Puri, Delhi

Dr. Gurcharan Singh

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

https://www.gurcharanfamily.com/

[Gurcharan Singh]

Some more images

Dr. Gurcharan Singh

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

https://www.gurcharanfamily.com/

[Gurcharan Singh]

One more image

[Gurcharan Singh]

one more image

[Gurcharan Singh]

It would be interesting to know whether this plant is round Kumquat (Citrus japonica Lour.) or Calamondin, Calamansi (Citrus x microcarpa Bunge).

eFlora of Pakistan treats Citrus microcarpa Bunge as synonym of C. madurensis Lour, with fruits 30 x 27 mm. eFlora of China however, treats C. madurensis Lour. as synonym of C. japonica Thunb. (also followed by POWO) but records fruit size 9-10 mm. 

In our plant fruits are mostly 25 to 40 mm in size.

Please help in resolving. The tree is still is fruit, so I can verify any feature. 

[Gurcharan Singh]

I am now convinced it is Citrus x microcarpa

https://www.gardenia.net/plant/citrus-microcarpa

https://en.wikipedia.org/wiki/Calamansi

 and not Citrus japonica

https://en.wikipedia.org/wiki/Kumquat

[Gurcharan Singh]

One more confirmation

Today Dr Vijay Sulladmath Retired Principal Scientist, Fruit Crops, identified it as Citrus x mitis Blanco

Luckily for me, it is synonym of C. x microcarpa according to POWO

[Gurcharan Singh]

Fresh images today

[Gurcharan Singh]

More images

[J.M. Garg]

Thanks, Singh ji,

What about other observations at 
https://efloraofindia.com/efi/citrus-japonica/?

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With regards,
J.M.Garg, 
https://efloraofindia.com/

[Gurcharan Singh]

Garg ji, I have given my comments on all posts on that page

I have been working on this small tree growing just below our flat. Initially I also thought it as C. japonica. My description resembled Citrus madurensis Lour as described in eFlora of Pakistan (Fruit size 3 cm x 2.7 cm), with C. microcarpa Bunge as its synonym. eFlora of China considered C. madurensis as synonym of C. japonica Thunb. (but silent on C. microcarpa). that led me to my earlier identification as japonica.

Now after a lot of studies I have concluded that fruits of C. japonica would have fruits smaller than 1.5 cm, 3-4 chambered with 3-4 seeded mature fruit, skin smooth shining.

C. x microcarpa Bunge on the other hand has larger fruits 2-4 cm, more look of mandarin, especially when young (because it is hybrid between mandarin-Citrus reticulata and C. japonica: that is why size is larger than japonica and smaller than mandarin. more important fruit is more than 5 chambered and more than 6 seeds (see my cut fruit), young fruit and mature fruit for comparison.

 

   

Dr. Gurcharan Singh

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

https://www.gurcharanfamily.com/

[J.M. Garg]

Thanks a lot, Singh ji

[Gurcharan Singh]

Typical images of C. japonica

https://www.alamy.com/kumquat-fruit-citrus-japonica-image465935152.html

Dr. Gurcharan Singh

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

https://www.gurcharanfamily.com/

[Gurcharan Singh]

Comparative fruit differences

Citrus japonica, Kumquat

https://en.wikipedia.org/wiki/Kumquat

Citrus microcarpa, Calamansi, Calamondin

https://en.wikipedia.org/wiki/Calamansi  

Dr. Gurcharan Singh

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

https://www.gurcharanfamily.com/