Furcraea selloa K.Koch, Wochenschr. Vereines Beförd. Gartenbaues Königl. Preuss. Staaten 3: 22 1860 (Syn: Furcraea flavoviridis Hook.; Furcraea lindenii Jacobi);


Images
by Ranjini Kamath (Id by J.M.Garg) (Inserted by J.M.Garg) (For more images & complete details,
click on the links) 

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Agave?2 for id-180709-RK-2 : 4 posts by 3 authors. Attachments (3)
Request Id for this plant. These varieties are currently in bloom
everywhere & the tall spikes look stately & quite spectacular. Pic
taken in Lalbagh -12-07-09.


Somebody had posted this earlier too. I thing it is Agave filifera.
The bloom that you see forms roots and drops down to grow into another plant. Each flower ultimately turns out to be an independent plant. given below is a link. http://en.wikipedia.org/wiki/File:Agave_filifera01.jpg


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Hooghly-skMAY07/08 a Pitcairnioideae member? : 5 posts by 2 authors. Attachments (9)


It can very well be other bromeliad, or may even be something else. I simply don’t have any idea.


After my summer vacation ends I will check for flowers


Appears to be close to Furcraea selloa K.Koch as per comparative images & keys at Agave


References:
The Plant List Ver.1.1
 WCSP  IPNI  e-monocot  Fact sheet (Keys)  Dinesh Valke’s Flickr Post  India Biodiversity Portal (Observation) Dave’s Garden S M Growers Floriculture in India By Gurcharan Singh Randhawa, Amitabha Mukhopadhyay (1986- Details)