50 PROCEEDINGS OF THE AMERICAN ACADEMY 



manner and upon the characters proposed by Fresenius in the Flora 

 Brasiliensis, Nuttall's name of Euploca would by right of priority take 

 the place of Schleidenia. But, iu retaining the comprehensive Helio- 

 tropiiun of Linna3us {Piptoclaina of Don perhaps separated), I prefer 

 to inckide Schleidenia, and also Bentham's section Platygyne, in Eaheli- 

 otropiuin, and to make of Euploca a primary section. It is character- 

 ized by the long filiform style, strongly penicillate appendage to the 

 stigma, and clidymous fruit, which separates promptly into four almost 

 hemispherical half-carpels. The corolla is unusually large for the 

 genus. ]Many years ago we had the plant in cultivation, and thought 

 it very ornamental. It is desii'able, and it ought not to be very diffi- 

 cult, to obtain it again. The pure white blossoms are open not merely 

 at sunset, but also (according to my memorandum) for nearly the whole 

 day. The name of H. convolvulaceum was applied to it in the Mem- 

 Am. Acad. 6, p. 403, 1859. There is an equally slender style in 

 Grisebach's H. serpylloides of the West Indies, and the cone surmount- 

 ing the stigma is occasionally bearded in other species. 



H. parcijlorum of Griseb. Cat. PI. Cub., and mentioned in the Flora 

 of British West Indies, cannot be the Preslcea parcijiora of Martins 

 (^Schleidenia Fresen.), for it has a strongly beaked fruit. It is perhaps 

 merely a form of H. humistratuni Cham. 



H. fruticosum Linn., described by Grisebach as having " stigma 

 as long as the style," has (even in a specimen named by and re- 

 ceived from him) a style several times longer than the stigma and 

 its tip. 



HeUophytmn molle Torr. Bot. Mex. Bound, p. 138, with globose, not 

 at all didymous, and when fresh probably more or less drupaceous fruit, 

 I refer to Tournefortia = T. mollis. 



LiTHOSPERMUii Tourn. Characters from the insertion of the sta- 

 mens and length of the style should be suspected ; for the tendency to 



H. iNUNDATUM Swartz. Stigma cono obtuso capitatum. 



H. CuKASSAVicuM Liiin. Stigma umbraculiforme, cono obsoleto. 



§ 3. TiARiDiDM (Lehm. Heliophytum DC.) 



* Fructus didymus, nuculis parallelis. 



H. PARViFLORtiM Linn. Keys of Florida and along the southern borders of 

 Texas. 



H. GLABRiuscuLUM. HeUophytum glahriusculum Torr. I.e. South-western 

 borders of Texas. 



* » Fructus mitragformis. — Tiaridium Lehm. 



H. Indiccm Linn. Naturalized in Southern Atlantic States. 



