DISTRIBUTION. 19 
and Tongking, with an endemic factor of үг, or 727. -If South-Western China, 
with its endemic factor of 1% or 23, be united to Indo-China east of the Irrawaday, 
we obtain a region with an endemic factor of $8, or 57:8. Ав this is again а smaller 
factor than that for Central and Eastern Indo-China taken together, we have to 
recognise that the natural affinity of South-Western China with the region to the 
east of the Irrawaday is hardly so great as the affinity of South-Western China with 
the rest of China, the endemic factor for the whole Chinese Empire being nearly 60. 
If, however, the district of South-Western China, with its endemic factor of 23, be 
annexed to the area between the Irrawaday and the Ganges with its endemic factor of 
21, we obtain a region where there are 26 species, of which 9 are endemic, and the 
endemic factor thus becomes 34°6. This union, giving an endemie percentage higher than 
that for either of the component parts, is at least justified by results. When in turn 
we add to the region between the lrrawaday and the Ganges, India to the south and 
west of the Gangetie plain, we obtain an area where the endemie factor is $, or 527. 
But this factor is still far below that for Eastern China, and it is only when the 
three regions—India proper; the Himalaya with Assam-Arracan and South-Western China ; 
and Indo-China east of the lrrawaday—are taken conjointly that we obtain a region 
where the endemic factor of 41, or 78°8, somewhat excceds that for Eastern China. 
Similarly, to attain a figure comparable with these factors, itis necessary to unite 
Malaya and Papuasia, when we get an endemic factor of 30, or 76°6, which is more or 
less intermediate between the factor for India, the Himalaya, South-Western China 
and Indo-China taken together, and the factor for Eastern China. 
Subjoined is given a conspectus of the facts presented in the foregoing para- 
graphs, in the form of tables showing (1) the distribution of the species of Dalbergia 
throughout South-Eastern Asia, aud (2) the endemic percentages of the various subareas, 
provinces, and sub-subareas :— 
TABLE I.—Distribution of Dalbergia £n South-Eastern Asia. 
| IlI.-SoUTHERY SUBAREA. | 
x 
I.— NORTH- aM ; 
| ERN. | lI.—CENTRAL SUBAREA 
| (à China. (4) Indo-Himalaya. LM (20) Malaya, (в) Papuasia., | 
ыс 
E 
Ks, 
SPECIES, E REMARKS 
T B . 
= : * g 4 в 
"5 š ер. s 
2 |4 z] Ф : 
sd 4 5 > š i © Ё š 3 £ š 4 # 4 
a 4 - = = @ = с 8 Ë © ы 8 £ š 
= 5121512 [= - eis Ф 8 м Е гі“ | A = š 
HESMHEPHHEHHEISHHPRHHE 21% 
ННБИВИНВВВ НН EE HE HEE 
д“ |з |2|ы|к|Л]|а|8|8|4|&|а|а|2|3|3|8|5|3|я]2|4]ж 
| І | 1 [n u| п|п іш "| II | I| II | и ш пиши ш ш ш ш ш Sub-areas. 
| i | ІШІП ii | ii ш | ш iviiviiviivi| v] v] v| v ШИЕ 
| | i| e |за оет 519110 п |а [з |as [пе [a7 |18 w| || Sub-sttbareas. 
АЧ. 
1. D. Albertisii “| 2. deu ucbed sl wey p меу рсе" woe | oos | om | von | see f sor | woe | oe | one 
* ... ... ... .. т... 
2. D. Beccarii fl oe Р К ш Тай ес ш COIS хе ы zh 
5, D. Cumingiana ... ур. eel eg ет 2 2 š 7 .. |... | see 
э - Lad 
КЕ D, parviflora ... .. ... кт» * | oso | ooe | oo Í... f -. [*] ы е 
: i : 
5, р. spinosa ... ... ... ... ET ... ... ... tee » » т .. s xai а E | 
€, D. discolor .. | ote p m . | ve f ooe f se Is em lee ... ... ese | ы zd a 
Ann. Roy. Bor. Garp. CALCUTTA, Vor. X. 
