46 FETCH: EXACUM ZEYLANICUM. 



these anthers resemble those of Exacum zeylankum var. 

 pallidum, but the tips of the anthers in the latter are not 

 curved . 



In Exacum Walkeri the anthers are short and stumpy, but, 

 in the dried herbarium specimens, they exhibit a feature 

 which at once separates them from E. zeylankum. On drying, 

 the furrow on the outer face assumes a V-shape at the apex, 

 and immediately above this is a minute tubercle formed of 

 clavate cells, up to 80 x 30 \k, with free, rounded ends. 



White forms of Exacum zeylankmm have not been previously 

 recorded. Trimen, in Flora of Ceylon, III., 182, under 

 E. macranthuyn, wrote : "A remarkable white variety was 

 gathered (by Miss Baker) in 1882, with pure white flowers, 

 having the corolla segments jagged at the margins." The 

 specimen is not now in Herb. Peradenij^a. 



It is proposed to call the present form var. Lewisii, 

 characterized by its white flowers and incurved anthers. 



Explanation of Plate. 



Fig. 1. — ^Anther of Exacum zeylanicum var. Lewisii, outer 

 face. 



Fig. 2. — Anther of Exacum zeylanicum var. Lewisii, inner 

 face. 



Fig. 3. — Anther of Exacum zeylanicum var. Lewisii, latera 

 view. 



Fig. 4. — Anther of Exacum Walkeri, outer face. 



Fig. 5. — Anther of Exacum Walkeri, inner face. 



Fig. 6. — Anther of Exacum Walkeri, lateral view. 



Fig. 7. — Anther of Exacum zeylanicum, outer face. 



Fig. 8. — Anther of Exacum zeylanicum, inner face. 



Fig. 9. — Anther of Exacum zeylanicum., lateral view. 



All figures drawn from herbarium specimens and enlarged 

 seven diameters. 



