Thanks Ganesh ji for this link
This is the simple key I could build based on Hortus Third, Manual of Cultivated Plants this website and other sources. You may refine it if you like:
Key to the commonly cultivated species of Crocosmia
1a. Perianth tube twice or more as long as lobes..........................................................................(2)
1b. Perianth tube shorter or equalling lobes.................................................................................(4)
2a. Inflorescence many-flowered, unbranched, one-sided...............................................................C. masoniorum
2b. Inflorescence few-many flowered, branched.............................................................................(3)
3a. Inflorescence forking, 15-25 cm long; perianth bright orange-yellow, tinged ed..........................C. pottsii
3b. Inflorescence much-branched, with often brush-like clusters of flowers.....................................C. paniculata
4a. Flowers orange yellow...........................................................................................................C. aurea
4b. Flowers crimson to orange-crimson........................................................................................C. crocosmiiflora
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Dr. Gurcharan Singh
Retired Associate Professor
SGTB Khalsa College, University of Delhi, Delhi-110007
Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018.
Phone: 011-25518297 Mob: 9810359089
http://people.du.ac.in/~singhg45/
lobes