548 Observations on some new 



This genus is allied to Humholdtia, as far as regards the number 

 of stamens, and their insertion into the mouth of the calyx, but 

 there the relation seems to end ; for that genus, with Jonesia and 

 a few others, form a small group distinguished by the stipes of the 

 ovarium cohering on one side Avith the tube of the calyx ; here it is 

 perfectly free. 1 have not seen the fruit, but the ovary in many 

 respects resembles that of several species of Pongamia and Ptero- 

 carpus. It seems, however, to belong to the second section of Cses- 

 alpinese of Decandolle, or third of Vogel, and to be more all-ed to 

 the genera with a diminished number of petals, ( Crudya and Di- 

 alium,) than to any of the others, on account of the simply pinna- 

 ted leaves with a terminal leaflet. Dr Wight remarks, that the 

 native name is Malle-vemboo-marum, meaning Hill-margosa tree, 

 or Azcidarachta Indica, to which it bears no resemblance whatever, 

 except in being also a tree with pinnatifid leaves. 



Another genus of the same group, but more allied to Macrolo- 

 bium, I have received from Bahia by the kindness of M. De Les- 

 sert (No. 2567) ; it does not agree with any of those described by 

 Vogel, and obviously differs from ^lacrolobium by the short (not 

 very long) style, and nearly equal petals. If not already named 

 by M. De Lessert, it may be called 



Zenkeria. 



Calycis sepala 3 in tubum turbinatum connata ; lacinias sub- 

 aequales, reflexae. P-etala 3, subaequalia, tubi ore inserta, obovata, 

 basi attenuata. Stamina 3, fertilia, erecta, petalis alternantia, se- 

 palis opposita ; filamenta libera, glabra, apice subiter subulata ; an- 

 therse oblongse, Ovarium stipitatum, compressum, pubescens, bin- 

 • ovulatum. Stylus brevis, crassus, glaber, stigma depresso-capita- 

 tum, obliquum. Fructus .... 



Arbor } glabra. Rami teretes. Folia pinnata, foUoh's 4-5, al- 

 ternis, petiolatis, ovalibus, obtusis vel retusis. Stipulse oblongce, 

 Vlove^ fasciculati vel subcorymbosi secus basin ramulorum juniorum 

 digesti, ante foliorum evolutionem expansi. Pedicelli^ore* xquan- 

 tes. Petala alba. Stamina petala cequantia. Stylus ovario semi- 

 ovali duplo brevier. 



1. Z. dalbergioides. 



I have named this in honour of the late Professor Zenker of Je- 

 na, the genus of that name described by Trinius being the same 

 with Amphidonax, N. ab E. in Lindl. Nat. Syst. p. 449 (excluding, 

 however, Arundo Bengalensis, Roxb. the only species there referred 

 3 



