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6. Colour. The colour of the leaves is a good character to many species. 

 We get with the aid of the leaves the following survey: 



A. Leaves of both young and adult plants quite green without colour 

 on the nerves: 



a. Peduncle central. 



a'. Leaves rounded at the base. Ligula with an auricle on both sides 

 of the base of the petiole {Paracurcuma), stem short; 

 a^. Auricle5 — 10 m.m. long; leaves very dark-green, spreading, short- 

 petioled. Bracts very pale-pink and light-green : C. ai/ra/z/mca. 

 b'. Auricles 2 — 3 mm. long. Flowering plant to '/a meter high. 

 Bracts all red purple: C. petiolata. 

 W. Leaves always acute at the base: auricles of the ligula not laterally 

 produced. Stem always more than '/a m- high: (Eucurcuma) 

 a^. Bracts of the coma snow-white. 



a^. Leaves narrow, not very large, light-green. C. domestica. 

 b^. Leaves large, broad, dark-geen (304 cod.) C. viridiflora. 

 b^. Bracts of the coma pink; sheath and ligula pubescent; leaves 

 broad (P = 2.5), light-green: C. soloensis 



C. Brog. 

 C ochrorhiza. 



b. Peduncle lateral. 



a'. Leaves with a very long-acuminate base, relatively narrow (P — 3 

 or more), ligula and sheath-edge ciliate: C. Mangga. 



b'. Leaves with a rather broad acute base, rather broad and firm 

 (P=:2.5); ligula nearly smooth: C. Heyneana. 



c'. Leaves very large and thick pale seagreen at the backside: 

 C. Lörzingii. 



B. Leaves with a red or purple cloud at least in the young plant: 



a. Peduncle central: 



a'. Hollow of the mid-rib brown-coloured exclusively on the upper side, 

 colour not extending over the parenchyma. Leaves of the coma 

 purple or pink. Brown colour of the younger leaves in old plants 

 mostly vanishing. Flowers white or yellow: C. colorata, C. euchroma. 



b". Hollow of the mid-rib red-brown, colour passing about a little into the 

 parenchyma so as to form a narrow feathershaped cloud on both sides. 

 Flowers white with a yellow central bar of the lip : C. pyrpwrasce/zs. 



b. Peduncle lateral: 



a'. Brown stripe on and along the costa sometimes very dark, in young 

 plants; totally vanishing in old plants: C. Mangoa, var. rubrinervis 

 and sylvestris. 



b'. Brown band and cloud persistent, vanishing only in abnormal 

 circumstances. 



