Ziziphus xylopyra

Ziziphus xylopyra (Retz.) Willd., Sp. pl. 1(2):1104. 1798 (Syn: Rhamnus rotundifolia Pers.; Rhamnus xylopyrus Retz.; Ziziphus cuneata Wall.; Ziziphus elliptica Roxb.; Ziziphus heterogenea Russ. ex Wall.; Ziziphus orbicularis Roem. & Schult.; Ziziphus rotundifolia (Pers.) Roth; Ziziphus ruminata Buch.-Ham. ex Wall.) as per Catalogue of Life

India: In dry deciduous forests, but sometimes also found in Sal forests. Throughout, except E. India; Nepal and Sri Lanka as per BSI Flora of India;

Nepal, India (throughout), Sri Lanka as per Catalogue of Life

Keys available in BSI Flora of India;
Flora of Ranga Reddi District: Andhra Pradesh, India By Thammineni Pullaiah, M. Silar Mohammed (Keys- Ziziphus glabrata, mauritiana, oenoplia & xylopyrus & Description- 2000)  

Flora of Eastern Ghats: Hill Ranges of South East India, Volume 1 By Thammineni Pullaiah, D. Muralidhara Rao, K. Sri Ramamurthy (Keys- glabrata, horrida, mauritiana, nummularia, oenoplia, rugosa & xylopyrus & Description- 2002

Z.caracatta is an unarmed small shrub / small tree, with glabrous leaves and fruit.
Z.xylopyra is a small tree [which may or may not be armed with prickles] and has tomentose undersurface of leaves and fruit.

Trees, to 12 m high, bark thin, brownish-grey, exfoliating in small scales; branchlets tomentose, sparsely armed. Leaves simple, alternate, stipulate; petiole 5-12 mm, tomentose, slender; lamina 5-8 x 3-5 cm, ovate-oblong or suborbicular, base rounded; apex obtuse, apiculate, margin serrulate, glabrous above, tomentose beneath, coriaceous; 3-5-ribbed from base; lateral nerves many, puberulent beneath; intercostae reticulate, faint. Flowers bisexual, in axillary cymes, greenish-yellow, pubescent; peduncle 1.5 cm long; calyx 5 lobed, 1.5 mm radiating; petals 5, 2 mm, spathulate; disc 5 lobed; stamens 5, filaments subulate; ovary 3-celled, ovules solitary; styles 3; stigma trifid. Fruit a drupe, 1.5-2.5 cm across, globose, woolly; seeds 3.     
Flowering and fruiting: May-June 
Dry and moist deciduous forests 
India, Nepal and Sri Lanka

Ziziphus xylopyrus (Retz.) Willd. or Ziziphus xylopyrus Hochst. ex A.Rich. [Illegitimate]:
Ziziphus xylopyrus Hochst. ex A.Rich. [Illegitimate] is a syn. of Ziziphus abyssinica Hochst. ex A.Rich.as per The Plant List link: http://www.theplantlist.org/tpl/record/kew-2471070 . It's not found in GRIN.
Ziziphus xylopyrus (Retz.) Willd. is not mentioned in the Plant List.
However, it is an accepted name as per GRIN:
Which is the Indian species found i.e. Ziziphus xylopyrus Hochst. ex A.Rich. or Ziziphus xylopyrus (Retz.) Willd. ? Pl. assist in the matter pl.
See one thread in this regard:
Ziziphus xylopyrus (Rertz.) Willd. SN Feb - 12 Attachments (1).  2 posts by 2 authors.
Ziziphus xylopyrus (Rertz.) Willd. Fam: Rhamnaceae
medium sized tree, near Chennai scrub jungle, fruit hard
Common around Pune too.
Ziziphus xylopyrus (Retz.) Willd.SN 15Jan 32 : 4 posts by 3 authors. Attachments (2) 
Ziziphus xylopyrus (Retz.) Willd., wild tree from Manmad area of Nashik dt, Maharashtra
Yes, the fruits are inedible..
..., but I have eaten a some of the wild ber vars. from ruins in my childhood. And some of them look like one in this photo.  
The fruits are very hard , that is the meaning of Xylopyrus (wood like fruit), it is difficult to eat. Some other wild species are there. Fruits of them are edible.

Another Ziziphus Species seen growing wild.
Ziziphus nummularia!
Any chance Ziziphus xylopyrus ??
Both the Ziziphus plants were growing nearby.
This and the other I have posted which you have also identified as Ziziphus xylopyrus.
Is it, …
it is also xylopyrus,
Thanks a lot for the ids.
Found two more pictures clicked at the same location.
Kindly validate.
2 images.
Yes, it's ma'am, some times complete habit pic will help us to exact, 

Ziziphus Species seen growing wild.
No flowers or fruits.
Ziziphus xylopyrus
Thanks, … Is the id correct for posts at Ziziphus xylopyra ?

Hoping there are mixed images of Ziziphus glabrata and xylopyrus
Which one is Ziziphus glabrata ?
As per mine, the first two photos belongs to glabrata out three photos in the first set,

References ((Ziziphus xylopyrus Hochst. ex A.Rich.):