OF ARTS AND SCIENCES. 837 



between Bonamia of Thouars and his Breweria, the two genera can- 

 not be maintained, and the older genus of Thouars must also include 

 Stylisma, Raf. Traces of the fleshy episperm are perceptible in B. 

 Roxburghii and in our B. (Stylisma) humistrata. 



HydrophyllacecB. 



The study of a Nama from the Sandwich Islands led to the ex- 

 amination of all the species known to me, with the following re- 

 sult : — 



NAMA, Linn. 



§ 1. Folia in caulem alato-decurrentia, obovata vel spathulata, pube 

 molli villosa seu pilosa : rami procumbentes. 



1. N. Jajiaicensis, Linn.: pube brevi ; foliis late obovatis spathu- 

 latis ; pedunculis brevissimis vel calyce brevioribus ; capsula oblonga 

 demum patente vel reflexa. — Key West, Blodgett. Mexico and 

 Texas, Berlandier coll. no. 2049, 2062, 2298; Drummond,coll.2, 316; 

 Lindheimer, no. 476, 642 (the latter with very large leaves) ; Wright, 

 Gregg, Ervendherg, no. 189. 



2. N. BiFLORA, Chois. : villosa ; foliis spathulato-oblongis ; pedun- 

 culis plerisque in pedicellos filiforraes (fructif. semipollicares et ultra) 

 bifurcatis ; capsula brevi. — Mexico, between Victoria and Tula, Ber- 

 landier, no. 2200, not 220 as recorded in DC. Prodr. 



§ 2. Folia in caulem baud decurrentia, sa?pius cinerea, nee incana: 



* Omnia in petiolum sat manifestum attenuata : radix dura, " ligno- 

 sa," perennis? 



3. N. ORIGANIFOLIA, H. B. K. : molliter cinereo-pubescens, caespi- 

 toso-diffusa ; foliis parvis (adjecto petiolo 3-6 lin. longis) obovatis seu 

 spathulato-oblongis, venis subtus prominulis ; floribus saepius geminis ; 

 pedunculis calyce brevioribus ; capsula ovali-oblonga. — N. origani- 

 folia & N. rupicola, Chois. Hydrol. & in DC. 1. c. N. subincana, 



Willd. in Roem. & Schult. 1. c. — N. dichotoma, var. parvifolia, Torr. 

 Bot. Mex. Bound, p. 147. — This occurs in Berlandier's collection as 

 no. 2254, collected " between Santander and Victoria," Mexico, upon 

 which specimens I suppose that Choisy's N. rupicola is partly found- 

 ed. The N. origanifolia figured and described by Kunth is, I pre- 

 sume, of the same species. But the plant, as I suspect from the 

 inspection of Berlandier's specimens, is not truly fruticulose, but is 

 VOL. V. 43 



