1890.] D. Prain— A List of Diamond Island Plants. 277 



the distribution within transgangfctic India beino; sub-divided as fol- 

 lows : — a. Arracan, Chittagong, Assam ; b. Pegu, Tenassei'im, Malay 

 Peninsula; c. Andamans (including Coco Islands,) Nicobars, Sumatra 

 and Java. This is necessary for a proper understanding of the peculiar 

 features of the flora of the island which forms (or at any rate is an ex- 

 cellent representative of) the area wherein these three lines of distribu- 

 tion meet and in which their species intermix. 



3. An analysis in terms of the preceding sections is undertaken 

 and the arithmetical values of the various relationships computed. 



§ §. List op the Plants collected in Diamond Island. 

 MENISPERMACE^. 



1. Cyclea peltata Hook. F. and Thorns. Common. 



NYMPH^ACE/E. 



2. N7M?HiEA Lotus Linn. In the only tank, uncommon ; the red 

 form is not present. 



3. Nelumbium speciosum Willd. In the tank. 



CAPPARIDE^E. 



4. Capparts sepiaria Linn. var. grandifolia Kurz (MSS. in Herb. 

 Calcutta) ; forma ramis foliisque glabris, foliis floribus et fructu quam in 

 formis varietatum aliarum mulfco majoribus. Distrib. Table Island 

 and Great Coco Island, (ipse) ; South Andaman, (Kurz). In Madura 

 Island and in Bali, (Teysmann in Herb. Calcutta). In Timor and in 

 Cochin-China (as Mr. Hemsley informs me) occur forms that connect 

 this very distinct looking- form with the typical plants. Branches oreen ; 

 leaves regularly elliptic, retuse ; petioles 05 — 0"7 cm. long ; laminse 6 — 10 

 cm. long by 4 — 5 cm. broad, quite glabrous both above and below, or 

 with a few scattered hairs, that soon disappear, on young leaves beneath • 

 flowers 15 mm. in diam. ; pedicels 18 mm. long ; gynophore 8 mm. long • 

 fruit 12 mm. in diam. (in Java specimens) to 14 mm. (in Diamond 

 Island ones). 



In the ordinary Indian plant, which also occurs without any con- 

 siderable variation in Burma and in Perak, as well as in the S. Indian 

 variety (incanescens) and in the Ceylon variety (retusella), the mea- 

 surements are ; petiole - 2 — 04 cm., lamina 2 — 3 cm. long by 15 2 



cm. broad ; flowers 7 — 12 mm. in diam., pedicels 16 mm. long ; gyno- 

 phore 5 — 6 mm. long ; fruit 7 — 8 mm. in diameter. 



Except, however, in the greater size of all its parts— most notable 

 as regards the anthers — which in var. grandifolia more than thrice exceed 



