Senegalia chundra (Roxb. ex Rottler) Maslin (syn: Acacia catechu var. sundra (Roxb.) Kurz);

If leaflets, young branches and calyx is hairy tomentose, then it is S. catechu. If these organs are glabrous, it is S. chundra.
Naturally, S. catechu is found in northern part of India, north of Maharashtra, while S. chundra is found in South of Maharashtra. However, S. catechu is being cultivated for extraction of tannins.
The characters ‘number of pinnae and number of leaflet’ are overlapping. Therefore, it is sometimes difficult to identify based on herbarium specimens. 
Place of collection will give basic idea whether the species is S. catechu or S. chundra. Senegalia polyacantha is distributed almost every state of India except northeast and temperate regions. To confirm the identity, it is important to observe bark, young stem, calyx. Pods of S. catechu and S. chundra are similar. They are reddish brown to brown at maturity while S. polyacantha showed light brown pods.  Also, please observe prickles are brown, smaller, about 2-4 mm in S. catechu and S. chundra while prickles are light brown, husk coloured and longer, about 3-8 mm in S. polyacantha.

That means key in the attachment at efi thread (Kshirsagar – 2012 – Observations and taxonomic assessment of Acacia catechu willd. complex (Mimosaceae) in India.pdf) w.r.t. number of pinnae more than 20 in Senegalia polyacantha (Willd.) Seigler & Ebinger & upto 20 in S. catechu & S. chundra is not correct.

I am very much sure that Senegalia catechuSenegalia polyacantha as well as Senegalia chundra are distinct species.  
The calyx of S. catechu and S. polyacantha are hairy (sometimes sparsely hairy in S. polyacantha); while calyx is completely glabrous in S. chundra
Bark of S. catechu and S. chundra is very similar. Grey white when immature while dark brown to black, fissured when matureS. polyacantha bark is white, papery, peeling out and armed with several, individual, prickles even on main trunk (probably the name is because of this feature: poly-a-cantha). Leaves of S. polyacantha are larger than other two species. Prickles in S. polyacantha is yellowish brown, recurved or straight, and about 0.5-1.0 cm long, while prickles in other two species are brown to black, mostly recurved and about 0.3 cm long. 


Images by tspkumar

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TSPNOV2015-32: Images of Senegalia catechu (Fabaceae) : 2 posts by 2 authors. Attachments (7)

It is my pleasure to share few images of Senegalia catechu….also called Acacia chundra (Fabaceae
Habit: Medium sized tree
Habitat: Wild  in scrub forest. .
Sighting: Konanakaval, Tumkur, Karnataka about 800 msl.
Date: 18-05-2015, 27-05-2014, 30-07-2014 and 07-09-2014  


I have images of this species but not as good as yours.


I think this should be Senegalia polyacantha (Willd.) Seigler & Ebinger as it has less than 20 pinnae as per keys in the attachment at efi thread 
As per details in efi thread & keys in the attachment:
I am very much sure that Senegalia catechuSenegalia polyacantha as well as Senegalia chundra are distinct species.  
The calyx of S. catechu and S. polyacantha are hairy (sometimes sparsely hairy in S. polyacantha); while calyx is completely glabrous in S. chundra
Bark of S. catechu and S. chundra is very similar. Grey white when immature while dark brown to black, fissured when mature. S. polyacantha bark is white, papery, peeling out and armed with several, individual, prickles even on main trunk (probably the name is because of this feature: poly-a-cantha). Leaves of S. polyacantha are larger than other two species. Prickles in S. polyacantha is yellowish brown, recurved or straight, and about 0.5-1.0 cm long, while prickles in other two species are brown to black, mostly recurved and about 0.3 cm long. 
Please find attached pdf of paper by Kshirsagar 2012. He differentiated all the three species based on morphology.  
1 attachment.


This is possibly S. chundra. If leaflets, young branches and calyx is hairy tomentose, then it is S. catechu. If these organs are glabrous, it is S. chundra.


Naturally, S. catechu is found in northern part of India, north of Maharashtra, while S. chundra is found in South of Maharashtra. However, S. catechu is being cultivated for extraction of tannins


Thanks, … That means keys in the attachment at efi thread (Kshirsagar – 2012 – Observations and taxonomic assessment of Acacia catechu willd. complex (Mimosaceae) in India.pdf) w.r.t. number of pinnae more than 20 in Senegalia polyacantha (Willd.) Seigler & Ebinger & upto 20 in S. catechu & S. chundra is not correct.
Pl. confirm.


The characters ‘number of pinnae and number of leaflet’ are overlapping. Therefore, it is sometimes difficult to identify based on herbarium specimens. 
Place of collection will give basic idea whether the species is S. catechu or S. chundra. Senegalia polyacantha is distributed almost every state of India except northeast and temperate regions. To confirm the identity, it is important to observe bark, young stem, calyx. Pods of S. catechu and S. chundra are similar. They are reddish brown to brown at maturity while S. polyacantha showed light brown pods. Please check the photographs which are attached in these mails. Also, please observe prickles are brown, smaller, about 2-4 mm in S. catechu and S. chundra while prickles are light brown, husk coloured and longer, about 3-8 mm in S. polyacantha.


Thanks a lot, …, for further clarifications.

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ID No. MS 290812-99- Acacia catechu: Attaching herewith photographs of Acacia catechu (Cutch tree) taken near the Shivanasamudra water falls in Kollegal district, Karnataka on 10.7.11. Reference for ID : Earlier link on eflora : photographs and description by … at, efi thread
I hope the ID is correct.


Affirmative … This is Khair [Acacia catechu]. My photographs for comparison are available at this link :
efi thread 


Yes it is Acacia catechu.


I think it may be Senegalia chundra as per discussions under TSPNOV2015-32: Images of Senegalia catechu (Fabaceae)


Ok, I will check. 


kindly validate this small tree. Is this Acacia chundra?
It has thorns.
Place: Satyamangalam RF; a scrub jungle.
Date: 08 Jan 2010


 

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Acacia chundra : 5 posts by 3 authors. Attachments (1)
Acacia chundra, (Fabaceae)
Place- Gadak, Karnataka, 2017, May


Just let me know as to how you will differentiate this species from A. catechu (Senegalia catechu) ?

Do you have any other images ?

As per … as per efi thread
After examining 600 herbarium specimens of Acacia catechu and A. chundra in various Indian herbaria, I conclude that the latter is a synonym of the former.

I think it may be Senegalia chundra as per discussions under TSPNOV2015-32: Images of Senegalia catechu (Fabaceae)


References:

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