Annona

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Annona glabra L. (Images by Renee & Aarti Khale (Inserted by Bhagyashri Ranade & J.M.Garg))

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Annona muricata L. (Images by Aarti Khale & Raman Arunachalam (Inserted by Bhagyashri Ranade)) 

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Annona reticulata L. (Images by Surajit Koley, Dinesh Valke & Aarti Khale (Inserted by Bhagyashri Ranade)) 

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Annona squamosa L. (Images by Satish Phadke & Aarti Khale (Inserted by Bhagyashri Ranade)) 

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Annona × atemoya Mabb. (Images by Aarti Khale – Identified by Pudji Widodo (Inserted by Bhagyashri Ranade))

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BSI Flora of India with details & keys (Volume 1- 1993) (Distribution):

Annona cherimola Miller (India: Tamil Nadu, cultivated; Central America, S. America and West Indies)
Annona glabra L. (India: West Coast of peninsular India, common along backwaters of Kumarakom Bird Sanctury in Kerala, naturalised in Kerala; Native of tropical America and West Indies)
Annona muricata L. (India: Assam, Maharashtra, Andhra Pradesh, Karnataka, Tamil Nadu and Andaman and Nicobar Islands; Central America and West Indies)
Annona reticulata L. (India: Cultivated and often naturalised, up to 1200 m. Delhi, Uttar Pradesh, Bihar, West Bengal, Assam, Orissa, Madhya Pradesh, Maharashtra, Andhra Pradesh, Karnataka, Kerala and Tamil Nadu; Native of Central America and W. Indies)
Annona squamosa L. (India: Cultivated and almost naturalised. Delhi, Uttar Pradesh, Bihar, West Bengal, Assam, Orissa, Madhya Pradesh, Rajasthan, Gujarat, Maharashtra, Andhra Pradesh, Karnataka, Kerala and Tamil Nadu; Native of Central America and West Indies)
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A synopsis of Annonaceae in Indian subcontinent by SR KUNDU (pdf-23 pages)- Thaiszia – J. Bot., Košice, 16: 63-85, 2006. :
Annona cherimola Miller, Gard. Dict . ed. 8, no.5. 1768.: India, C & S America, West Indies. 
A. glabra L., Sp. Pl . 537. 1753. : India, Sri Lanka, Native of tropical America, West Indies , West Africa.
A. muricata L., Sp. Pl .1. : 536. 1753. : India, Central America, West Indies .
A. reticulata L., Sp. Pl .1 : 537. 1753. : India, Nepal , Bhutan, Central America, West Indies .
A. squamosa L., Sp. Pl .1 : 537. 1753. : India, Nepal, Central America, West Indies.
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From Floral Database of Tamilnadu :

Binomial Habit Notes References Distribution
Annona
cherimola Mill. 		 Tree Western Ghats
& Eastern Ghats, High Altitude, Cultivated, Native of Tropical
America   		 Flora of Tamil
Nadu, VOL. I, 1983		 Dindigul,
Nilgiri, Salem
Annona muricata L. Tree Eastern
Ghats, Cultivated, Native of Tropical America		 Flora
of Tamil Nadu, VOL. I, 1983		 Namakkal,
Viluppuram		  
Annona reticulata L. Tree Plains
to Mid Altitude, Cultivated, Native of Tropical America 		 Flora
of Tamil Nadu, VOL. I, 1983		 All
districts
Annona squamosa L. Tree Plains
to Low Altitude, Cultivated, Native of Tropical America		 Flora
of Tamil Nadu, VOL. I, 1983		 All
districts
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Species with description & pictures in Flowers of India as on 9.3.14:

Botanical name Synonyms Family Common name
Annona glabra Annonaceae Pond Apple
Annona reticulata Annona humboldtiana, Annona humboldtii Annonaceae Netted Custard Apple
Annona squamosa Annonaceae Sugar Apple
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Species with description & keys in Flora of Pakistan (Distribution):
Annona muricata L. (Widely cultivated in Old and New World tropics)
Annona reticulata L. (Widely cultivated in Old and New World tropics)
Annona squamosa L. (Widely cultivated in Old and New World tropics)

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Species with distribution in annotated checklist of Flowering plants of Nepal (Distribution):
Annona reticulata L. (West Indies. Cultivated throughout the tropics (Custard Apple))
Annona squamata L. (? Annona squamosa L.) (West Indies. Cultivated throughout the tropics)
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Some species found in India with description & keys from Flora of China [Distribution other than China] :
Annona cherimolia Miller [native to tropical America].
Annona glabra Linnaeus [native to tropical America].
Annona muricata Linnaeus [native to tropical America].
Annona reticulata Linnaeus [native to tropical America].
Annona squamosa Linnaeus [native to tropical America].

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The Encyclopedia of Fruit & Nuts edited by Jules Janick, Robert E. Paull (2008)- (p.43)- Details-

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Indigenous Drugs Of India By Chopra R N, I.C. Chopra- Brief details-

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Flora of Medak District, Andhra Pradesh, India By T. Pullaiah, Chintala Prabhakar, B. Ravi Prasad Rao (1998)- Details-
Annona squamosa

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Flora of Davanagere District, Karnataka, India By B. K. Manjunatha, V. Krishna, T. Pullaiah (2004)-
Annona : 1 post by 1 author.

I have updated eFI (efloraofindia) page on Annona

Attempts have been made to incorporate most of the species available in India & nearby areas with details & keys directly or through links as far as possible. It’s quite possible that there may be some discrepancy in the accepted names & synonyms taken from other links.

Species discussed so far in efloraofindia are given at the bottom of the page in the form of links against Subpages. On clicking them one can see all the details.

If someone can provide complete list of Indian species with source references it will be wonderful.

Any comments/ corrections are welcome.

Further updated eFI (efloraofindia) page on Annona

Pl. go through Annona (‎Annonaceae) page with images of species (mainly done by Bhagyashri ji) in efloraofindia.

If you find any mis-identification, pl. let us know. If anybody can send images of other species of this genera (for incorporation in the website), if any, it will be really nice.
Also, if anybody is interested to take up the activity of inserting images on efloraofindia pages from efloraofindia posts, pl. let us know.