essential structure, seeing that those of Begonia are 

 so unequivocally axile, the only difference between 

 parietal and axUe placentation being that the carpels 

 in the former case meet in the parietes, and without 

 proceeding further form placentse at the point of union 

 of the two leaves, while in the latter the edges dip 

 down to the centre, and there meeting, I think, form 

 the placenta from the union of the two margins of the 

 same leaf. 



DiPLocLiNiuM (Lindley). 



This genus was established by Dr. Lindley, to 

 include all those Begonias having a double placenta. 

 It has not yet been admitted into systematic works, 

 but as it seems to rest on a very sufficient and easily 

 ascertained character, I readily adopt it here. In 

 habit and in all other respects it seems to agree with 

 Begonia, but as that genus is a very large one (up- 

 wards of 160 species) it is desirable to divide it by 

 any feasible means within our reach, and the double 



1811. Begonia Grahamiana (R. W.)i root tu- placenta seems very properly taken advantage of for 



berous ? stemless : leaves long petioled, peltate, sub- 

 orbicular, glabrous above, punctuate and slightly 

 villous on the veins beneath; ciliate on the margin: 

 ^etiols furnished with large scariose bracts at the 

 base : scapes exceeding the leaves, slightly hairy to- 

 wards the apex, glabrous below : corymbs loose, many- 

 flowered. 



Courtallum, in dense forests, flowering August and 

 September. 



I dedicate this handsome species, of this, his favourite 

 genus, to the memory of the late Dr. R. Graham of 

 Edinburgh, one of its most successful cultivators and 

 to whose skill in cultivating and accuracy in describ- 

 ing them we are indebted for much of our acquaint- 

 ance with its numerous species. The peduncle is re- 

 presented a little too rough. 



1812. Begonia subpeltata (R. W,), root tuber- 

 ous with a solitary (always?) long petioled sub-orbi- 

 cular sub-peltate leaf; leaf serrated and with the petiol 

 sprinkled with coarse short hairs, most numerous 

 at the insertion of the petiol : scape filiform, about 

 the length of the leaf, ending in a few-flowered 

 raceme. 



The station is not mentioned, but I think Malabar. 

 In di"ied plants the leaves are most delicately mem- 



the purpose. 



1814. DiPLocLiNiUM BiLocuLARE (R. W.), hcrba- 

 ceous, erect, few-leaved (1 or 2) ; leaves petioled, 

 or sub-peltate, sub-orbicular slightly oblique, doubly 

 and finely serrated, slightly acuminate, pube - 

 scent on both sides, more densely on the veins beneath : 

 corymb loose, many-flowered, male 4- female 5-petal- 

 ed, ovaiy 3 -winged, 2 -celled. 



Mergui, Griffith. 



I am indebted to the late Mr. Griffith for several 

 specimens of this plant. They have all, except one, 

 two leaves, and one of those on the plant represented is 

 decidedly peltate, the other sub-peltato-cordate. The 

 artist, in the upper figm-e, has represented the pube- 

 scence as too decidedly steUate, and in the other 

 the pubescence is too sparing. In other respects the 

 figure gives an excellent idea of the plant represented. 



1815. DiPLocunauM Abnottianiim (R. W,), stem- 

 less, root tuberous : leaves orbiculato-cordate, crenato- 

 serrate; above sprinkled with coarse jointed hairs; 

 below glabrous except the hairy veins : scape shorter 

 or about as long as the leaves, few-flowered : flowers 



all 4-petaled, wings about equal. 



Com'tallum, in dense forest, flowering July and 

 August. 



The hairs as they appear in this plate are not 



branous and transparent, and the hairs become so -^eil represented, those sho-vvn in the following. No. 

 shrivelled that they are scarcely visible unless when isie, give a much better idea of them. 



viewed by transmitted light. 



1813. Begonia dipetaia (Graham), shrubby, 

 erect: leaves semicordate, somewhat angled, acute, 

 doubly serrate, smoothish: stipules semi-cordate, flow- 

 ers dipetalous, wings of the capsule about equal, 



roundish. 



Neilgherries, very frequent at an elevation of from 

 4 to 6 thousand feet, in moist woods growing in 

 crevices of moss-covered rocks and elsewhere. 



This is a very handsome species which I have 

 found on many other hills, besides the Neilgherries. 

 So often indeed, and so variable, that I suspect there 

 are more than one Indian species characterised by 

 the terms, "floribus dipetalis." But in truth the 

 genus is a most difficult one, as up to the present 

 time, no well-executed monograph of its species ex- 

 ists to guide the colonial Botanist to a knowledge of 

 the distinctive marks by wliich they may be discrim- 

 inated. Dr. Graham's figure in the Botanical Maga- 

 , taken from a j^oimg plant, gives a very imper- 

 fect idea of the species. The stems are straight, rod- 

 like, generally without a branch, the leaves, in the 

 wild state, are rarely spotted as represeijted, and 

 towards the apex almost every leaf is furnished 

 with its cyme of male and female, beautiful rose- 

 coloured, flowers. 



1816. Dipi-ocLiNiuM coRBirox-iuM (R. W.), stem- 

 less, tuberous, (?) leaves long petioled; petiols fur- 

 nished at the base with scai'ious stipules, glabrous; 

 limb orbicidar, crenato-serrate, deeply serrato-cor- 

 date at the base, spai'ingly sprinkled above with 

 coarse jointed hairs: scapes about as long as the 

 leaves, cymose : cymes loose, spreading, many-flower- 

 ed : flowers smallish : male 4-petaled, female 3 or 4 : 

 wings equal. 



Malabar, in forests, flowering June. 



1817. Dipi-ocLiNiuM LiNDiiEYANUM (R. W.), Stem 

 erect, herbaceous, flexuose, branchless : leaves semi- 

 cordate, oblong, acuminate, muricato-dentate on the 

 margm ; glabrous on both sides : cymes axillary, loose, 

 many-flowered : flowers rather small, 4-petaled, wings 

 about equal. 



Courtallum, and Malabar. 



This so much resembles Rheede's figure (Hort. MaL 

 9 — ^t, 86, quoted by Dryander and Roxburgh, for B. 

 Malaharica)j that I at first so named this plant, but 

 the inflorescence is so different that I felt it necessary 

 to relinquish that name. Dryander remarks on the 

 strange circumstance of the female flowers having 

 only 3 petals. I do not attach much importance to 

 it, as it seems merely the result of accidental abor- 

 tion, which may be seen in both male and female 



( 9 ; 



c 



