12 CHLORIS BOREALI-AMERICANA. 



tiola, approaching it in its two-leaved corolla, differs in having axil- 

 lary flow^ers supported by four bracts, a two-leaved calyx, two sta- 

 mens, a two-celled ovary sunk in a fleshy disk, and a radiately 

 expanded six-cleft stigma, supported by a short style." * 



I have already observed, that I can find no fleshy disk in Empe- 

 trum ; and in the few flowers of Corema which I have been able to 

 examine there is certainly no more trace of a disk than in Oakesia 

 itself. There is usually a distinct though short style in Empetrum ; 

 but the scattered solitary flowers, proper petaloid perianth, 6-9- 

 celled ovary, and, above all, the direction of the seed and embryo, 

 which I have now pointed out, abundantly distinguish Empetrum 

 from the jilant in question. Ceratiola is distinguished by its scat- 

 tered dimerous flowers and greatly developed laciniate stigmas ; the 

 latter, however, are two, deeply 2-parted, and incised, rather than a 

 " stigma subsexfidum." But as respects Corema, I can confirm 

 none of the distinctive marks that have been indicated. Where Dr. 

 Klotzsch refers to the " want of bracts " in Corema, he has, I fear, 

 misapprehended the phrase, " Calyx triphyllus membranaceus, basi 

 nudus," of Don, who evidently refers to the want of bracteolce, be- 

 yond the six which he regards as calyx and corolla.f In this re- 

 spect, as well as in the texture and appearance of these envelopes, 

 Corema and Oakesia are quite alike, except that the number in 

 the latter is sometimes one fewer. The casual union of the inner- 

 most may surely be disregarded. The style and its branches are 

 shorter in the Portuguese than in the American plant, but the difler- 



* London Journal of Botany, I. c, p. 446. 



t If, on the other hand, Dr. Klotzsch refers to proper bracts, namely, the scales 

 of the capitulum subtending each flower, these certainly are present in Corema, £is 

 well as Oakesia, though not so conspicuous, and are described by Don and Endli- 

 cher. In Oakesia they are rounded and pointless ; in Corema, acuminate. 



