36 CHLORIS BOREALI-AMERICANA. 



it for the real Physostegia truncata of Bentham, and altering the 

 specific character to make it accord with the plant before him. 



These two species were subsequently gathered by Lindheimer, 

 and distributed as No. 286 and No. 287 of his collection for 1844.* 

 So numerous are their points of difference, that Dr. Engelmann, 

 who had noticed them with his usual accuracy, proposed to con- 

 sider the two as the types of distinct genera. I preferred, how- 

 ever, to combine them, in view of their entire agreement in habit, 

 and in the mode in which the enlarged and gibbous fructiferous 

 calyx is closed by the appression of the lower lip, notwithstanding 

 the striking differences in the form of the calyx as well as of the 

 corolla. The character of Brazoria was accordingly framed so as 

 to embrace the two species, B. truncata and B. scutellarioides. 

 But, through inadvertence, the synonym of Hook. Bot. Mag,, 

 t. 3494, was cited under the former species, instead of being re- 

 ferred to B. scutellarioides, where it really belongs. 



The genus is well distinguished, not only by the remarkable 

 calyx, but by the manifestly didynamous stamens, the divaricating 

 anther-cells, &c. 



Brazoria truncata is a rather showy annual, with the stem nearly 

 simple, or else branched from the base, about a foot high, terminated 

 by a single spike, and sometimes with one or two lateral ones from 

 its base. The corollas are an inch long, dull purplish rose-color, 



* By a typographical error, the two numbers are transposed in the published ac- 

 count (PZaraits Lindheimer iana); where the first, namely, jBrazorta iruncata,s\ion\d. 

 be No. 287, and the second, B. (Stachyastrum) scutellarioides, should be No. 286. 

 There is also an obvious transposition in the description of the calyx of B. truncata. 

 The lobes of the " lower lip of the calyx," instead of the upper, are said to be 

 " merely mucronulate in the middle," and " those of the upper," instead of the 

 lower, as it should be, " erose-denticulate." 



