dm op h oh s amcricana. i 5 



Cross sections of the stalk, which happen to be under or at 

 the base of the leaf (Plate V, Fig. 3), show invariably a 

 migration of bundles from the inner toward the outer row, 

 and from the outer toward the leaf. This would seem to 

 indicate that both rows of bundles consist of leaf traces, but 

 for reasons which will be given later, it is certain that this is 

 only directly true of the outer row, which may be considered, 

 then, to be both cauline and leaf trace, whereas the inner 

 row is cauline. 



The epidermal cells of the flower stalk are somewhat irregu- 

 larly thickened, and contain stomata. Strange to say, there are 

 no stomata on either surface of the leaves, another indication 

 of the greater depth of parasitism to wdiich this particular 

 member of the OrobaiicJiccB has descended. 



The Orobanclicce in general have more numerous stomata 

 than most parasitic plants (Unger, Exantheme d. Pfl.), but 

 Conopholis is not the only member in which they are curiously 

 placed. LatlircEa Sqnamaj'ia has them on the pistil only 

 (Krause), while in the closely allied species, L. clmidcstina, 

 they are in normal numbers and on the leaves (Duchartre). 



Immature Flowering Stalks. 



Plate IV, Figs, i, 2, 3 and 4, are photomicrographs of ver- 

 tical sections through young buds of flowering shoots. It will 

 be observed that in Figs, i, 2 and 4 are plainly seen the outer 

 and an inner row of fibro-vascular bundles already described 

 in the adult shoot. These anastomose with each other and in 

 no case "end blindly beneath the apex of the stem" as they 

 are said to do in other genera of OrobanchccB (de Bary). 



Figure 3 is taken from a section cut at such an angle that 

 the anastomosis of the numerous bundles of both the inner 

 and outer circle is demonstrated. 



In Fig. 2 it will be seen that the outer circle consists of 

 leaf-trace bundles, and also that the inner circle anastomoses 

 with it at intervals below, as well as at the apex. This as 



