. 



336 swingle: new citrous genus, pamburus 



In the course of a revision of the plants related to Citrus it has 

 been possible for the writer to examine much material referred 

 to the genus Atalantia and it has become evident that decidedly 

 diverse plants have been put into this genus. The true Atalan- 

 tias congeneric with the type species, A. monophylla (Roxb.) 

 DC, have fruit resembling miniature oranges, with pulp vesicles 

 somewhat like those of other citrous fruits. Atalantia missionis, 

 on the contrary, has, as noted by Wight in the original descrip- 

 tion, a small fruit with cells "containing a very glutinous muci- 

 laginous fluid." Besides this very significant distinction, A. 

 missionis differs from A. monophylla and its congeners in having 

 the anthers linear-oblong instead of broadly ovoid, and in hav- 

 ing a tall, narrow disk supporting the ovary, instead of a very 

 short, thick one. The leaves differ widely from those of the 

 true Atalantias in texture and venation, being thick, glabrous, 

 with both faces nearly alike, and velvety gray-green when dry, 

 showing only a very few obscure lateral veins and no reticulate 

 veinlets. 



Because of these numerous points of difference, some of them 

 of much taxonomic value in this group, it seems necessary to 

 create a new genus, Pamburus, 2 to include this remarkable species. 



Pamburus Swingle, gen. nov. 3 



Much-branched thorny shrubs or small trees; young branches angled, 

 becoming rounded when older, with single stout sharp straight thorns 

 at one side of the bud in the axils of the leaves. Leaves unifoliolate, 



2 From the Singhalese name pamburu. 



3 Pamburus Swingle, gen. nov., Paramignyae affinis, sed frutex vel arbuscula, 

 foliis crassis, coriaceis, utrinque similibus, venis inconspicuis, petiolis brevibus, 

 rectis, pulvinis carentibus, ovario disco magno innixo. 



Folia unifoliolata, petiolis brevibus apteris; laminae crassae, siccitate cinereo- 

 virides, superficiebus superioribus et inferioribus similibus, venis secondares 

 inconspicuis, tertiis carentibus; spinae singulae, rectae, axillares. Flores magni- 

 tudine mediocres, odoratae; petala alba, obovata, caduca; stamina libera, 

 filamentis tenuibus, subulatis; stylus tenuis; stigma subglobosum diametro 

 stylo multo majus; ovarium 5-4-loculare, ovulis in loculo binis. Fructus subglo- 

 bosus, cortice ut in Citro carnosa, loculis 1-2-spermis, liquoris glutinosi plenis. 

 Semina subglobosa. 



Arbusculae vel frutices ramosi, spinosi, ramulis junioribus angulosis. Species 

 typica, Pamburus missionis (Limonia missionis Wight). Habitat in India. 



