THE INDIAN SPECIES OF EEIOCAULON. 53 



Kurzii of E. gracile, and in group V. in E. Edwardii. A reduc- 

 tion of the female petals till they are only as wide as the hairs which 

 spring from the base and form with them a tuft or brush, occurs in 

 group I. in E. Thwaitesii, and in group VI. in E sexangulare (see fig. 

 7). From the former species arose E. achiton with no petals at all. 

 The submerged habit is correlated with filiform leaves in group I. in 

 E. gregatum and E. barba-caprae, and in group VIII in a series begin- 

 ning with E. breoiscapon and ending with E. fluvatile ; while in group 

 II it is accompanied by a great lengthening of the stem. 



This work was only rendered possible by the kindness of the 

 officers in charge of the herbaria in the Eoyal Botanic Gardens, 

 Calcutta (which has most of the types) ; the Agricultural College, 

 Coimbatore ; the College of Science, Poona ; the Forest College, Dehra 

 Dunn ; and the Eoyal Botanic Gardens, Peradiniya, in placing their 

 material at my disposal for examination, and to them my thanks are 

 due and warmly tendered ; but particularly to Lt.-Col. A. T. Gage, the 

 Director of the Botanical Survey of India, and Superintendent of the 

 Eoyal Botanic Gardens, Calcutta whose collection is the largest and 

 contains most ' types '. 



Explanation of the Figures 



