In agricultural or botanical context,
pannicle=पुष्प गुच्छ (as defined in Consolidated glossary of technical terms. However, the glossary spells it as "panicle")

The pictures in these references make the meaning clear:

1)After 3 or 4 years, it produces a large pannicle of up to 80 white, five petaled flowers, 1/2 inch across.
http://www.mygardenguide.com/plant_detail.html?id=305

2)White pannicle flowers in spring and summer. Grows approx. 75cm-1m per year.
http://www.highwayhardware.com.au/gardening/feature_hedge.ht...



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Note added at 14 hrs (2006-02-03 00:50:43 GMT)
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For your context, it could be bajre ka pushp guchh (बाजरे का पुष्प-गुच्छ)

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Note added at 12 days (2006-02-14 16:35:24 GMT)
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Hi Mridula, Please have a look at this file and see whether it clarifies your doubts:

http://www.cahe.nmsu.edu/pubs/_a/A-414.pdf

There is another one at:
http://www.fao.org/documents/show_cdr.asp?url_file=/DOCREP/T...

and at:
http://www.syngentafoundation.org/what_is_pearl_millet.htm

These files are specifically related to pearl millet/other types of millet and you will find the word "panicle" mentioned in both of them.

This website has photographs of rice panicle:
http://www.gramene.org/oryza/rice_intro.html

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Note added at 12 days (2006-02-14 23:53:47 GMT)
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The online dictionary at www.shabdkosh.com also has this word. Try:
http://www.shabdkosh.com/cpnt/option,com_enghindi/e,panicle