barnhart: genera in lentibulariaceae 43 



be uniformly present in some species and absent in others, there 

 are species in which the free basal portion may be developed or 

 not, even in the case of two bracts on the same scape. It is 

 evident, therefore, that this third type of free base is of little 

 taxonomic significance. 



The bractlets, when present, are always two to each pedicel, 

 opposite to each other, and lateral with respect to the median 

 bract. In Aranella they are borne distinctly above the base of 

 the very short pedicel, but distinctly below the calyx, and simulate 

 a pair of lateral exterior sepals. In all the other genera in which 

 they occur they are at the base of the pedicel. In most cases 

 they are inserted just above the bract, and more or less enfolded 

 by its base; but in at least one genus they are inserted on the 

 same line with the bract and are commonly more or less coherent 

 with it. There results a single three-lobed bract, but the bract- 

 lets always manifest their presence as distinct lateral lobes, and I 

 have never experienced any difficulty in deciding whether a bract 

 was actually without bractlets or had bractlets adnate to it. 



Below the lowest bract the scape may be naked, that is, wholly 

 destitute of foliar organs, or may bear appendages for which the 

 word "scale" is in use, and is ordinarily appropriate. In some 

 cases the scales resemble the bracts so closely that one might 

 suppose them to be merely bracts in whose axils the pedicels had 

 failed to develop, but frequently there is a marked contrast 

 between the bracts and the scales. For instance, in Aranella 

 the bracts are basifixed while some or all of the scales are peltate. 

 In many species of Utricularia the so-called scales are developed 

 into large hollow floats, verticillate or subverticillate; indeed, these 

 conspicuous organs suggest themselves at once as a possible basis 

 for generic segregation. A study of the species bearing them 

 shows, however, that they differ from each other more widely than 

 from some of the species without floats, and if the ampulla-bearing 

 species are to be separated from Utricularia, a philosophic treat- 

 ment will require that they be distributed into several genera 

 rather than kept in one. 



The calyx-lobes are usually nearly equal, the most marked in- 

 equality occurring in Meloneura, where the upper lobe is much 

 larger and is adnate to the base of the ovary. In texture they are 

 commonly herbaceous, but may be scarious, foliaceous, or even 



