114 NEW GENERA OF PLAKtS. [October. 



the white colour of the corolla, as seems necessary for the 

 purposes of the flower. In consideration of this singular 

 structure, I propose to call this plant Hemianthus, de- 

 rived from two Greek words ^if^icv^, half, and dveoq, a 

 fiower; the corolla being halved, or consisting, as it were, 

 of a single lip. 



I shall now proceed to describe these plants in the or- 

 der in which they were discovered. 



Linnccan Class cwflf Order. 



TETRANDRIA.— Tetragynia. 



Natural Order, Semperiv m — Jussieu, 



Genus TILLiEA. 



T. simplex, caule erecto, simplici; foliis connatis, ob- 

 tongo-linearibus, acutiusculis; floribus alternis, sessilibus; 

 petalis erectis, calyce duplo longioribus. 



Description, — Annual. iS'^^m generally simple, erect 

 and terete, (2 or 3 inches high) sometimes decumbent 

 near the base, and sending out whitish radical fibres, 

 tinged with red, similar to the proper root. Leaves con- 

 nate, succulent, convex on the under side, fragile, very 

 entire, and without visible nerves or veins (3 or 4 lines 

 long, and about a line wide.) Flowers sessile, axillary, 

 solitary, and alternate. Cali/x four-toothed, segments al- 

 ternating with the petals, two of the exterior dentures 

 somewhat larger and obtuse. Petals four, ovate, erect, 

 and persistent, never apparently expanding, whitish and 

 membranaceous, embracing the capsules with which they 



