Lilium davidii

Lilium davidii Duch. ex Elwes, Monogr. Lilium 1: t. 24 1877. (syn: Lilium biondii Baroni; Lilium cavaleriei H.Lév. & Vaniot; Lilium davidii var. davidii ; Lilium davidii f. macranthum Raffill ex Woodcock & Coutts; Lilium davidii var. macranthum (Raffill ex Woodcock & Coutts) Raffill; Lilium davidii var. schootii Bergmans; Lilium davidii var. unicolor (Hoog) Cotton; Lilium sutchuenense Franch.; Lilium thayerae E.H.Wilson; Lilium willmottiae var. unicolor Hoog);

Lilium davidii is an Asian species of plants in the lily family, native to mountainous areas of Assam, Manipur, Arunachal Pradesh, Tibet, Bhutan, Hubei, Shaanxi, Sichuan, Guizhou, and Yunnan.^[1][2][3]
Lilium davidii grows up to 1.5m high, and bears up to about 20 unscented flowers with recurved leaves (bent backwards), orange or reddish orange, from July to August.^[4]
The plant is cultivated for its edible bulb.^[4] It is a stem-rooting lily (adventitious roots emerging above the bulb) that also forms bulbils.
The species is named for French missionary and naturalist Armand David (1826-1900).(from Wikipedia on 19.2.16)

The lilium is an Asiatic hybrid of L. hansonii & L. martagon.

I could find a very good link regarding information on L.davidii, as below:
http://www.pfaf.org/database/plants.php?Lilium+davidii
http://en.wikipedia.org/wiki/Lilium_davidii

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References:
The Plant List Ver.1.1  WCSP  e-monocot  India Biodiversity Portal Wikipedia  PFAF  Pacific Bulb Society