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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