uniflori prope basin hibracteati, bracteis lanceolatis, semifoliaceis margine membranaceo, 

 pubescent** puis brevibus, porrectis, glanduloso-capitatis, numerosis. Calyx 5-partitus, 

 sevalis JanceoJatis, ncutissimis. vix acuminatis, concaviusculis, trinerv-iis, viridibus nunc 

 fusco-purpureo tinctis margine albo membranaceo, extus pilis nonnullis brevissimis minute 

 capitatis conspersis, persistens. Petala 5, integerrima, alba, calyce paulo breviora, ovali- 

 oblonga v. elliptica, integerrima, basi parum attenuate, persistentia. Stamina decern, 

 margini disci brevisshni subcarnosi, dubia? originis, perigyni potius quam hypogyni, inserta. 

 Filamenta subulato-filiformia, glabra. Anthers, ochroleuca?, subrotunda?, loculis approximatis, 

 appositis, longitutlinaliterdehiscentibus. Ovarium sessile, ovatum, glabrum, uniloculare, poly- 

 spermum. Stigmata quatuor (passim 3 et 5) filiformia, alba intus longitudinaliter hispidula. 

 Capsula calyce persistenti appresso saepius paulo longior,' nunc eundem suba?quans, qua- 

 drivalvis, passim 3 et 5-valvis, valvis vix omnino ad basin distinctis. Receptaculum seminum 

 centrale, longitudine fere capsula?, cum apice cavitatis primo connexum mox solutum. Semina 

 reniformia, la?via, fusca, funiculis umbilicalibus cum receptaculo communi persistentibus. 



20. Aeenaeia ltossii, glaberrima, foliis triquetro subulatis obtusiusculis muticis enerviis 

 florem vix sequantibus, pcdunculis unifloris elongatis, petalis oblongis calyces obsolete triner- 

 vios paulo superantibns. 



Df.sc. Hrrba |>usilla, ^Ifihi-j-rinui. Canle-i ramosissimi, ca?spitosi, dense foliati. Folia 

 opposifabasibns coiinatis, carinata. Pedunculi foliis aliquot.ks longiorcs. Calyx 5-partitus, 

 purpurascens; sepala aequalia, ovata, acutiuscula, modice concavn, obsoletissime trinervia, mar- 

 ginibus membranaceis nudis. Petala 5, angusto-oblonga, obtusa, intcgra, alba, calyce paululum 

 longiora. Stamina 10. Filamrnta disco scutelliformi subcarnoso potius pcrigyno quam 

 Jiypogyno inserta, c latioiv b;tsi filif'onnia, glabra, alba. Anthera ovalcs, ochroleuca?. Ovarium 

 ovatum, sessile, uniloculare, glabnnn, polygpermum. Stigmata 3, filiformia. 



Obs. Arenaria Hossii, Richardson in Franklin's journ. p. 738, paulo divcrsa est statura 

 tnajore, foliiH calyeein longitud'mc supi rantibus, minus crassis nee adeo obtusis, internodio 

 wi-pius biwioriluis, calycis toliolis dunlins cxterioribus parum brevioribus, nervis latcralibus 

 omniiiiii niaiiiicHtioi-ibiis, (ictalis longitudine calycis. In hac capsula trivalvis calycem a?quat. 



Alsinc siriciii Wahlenb. lapp. p. 127. ab Arenaria Rossii Richards. 1. c. differt statura 

 <lii]ilii majurc, liilii limgioribus acutis aliisque not is. 



SAXIFRAGE/E. 



Char. Gen. Stamina 10, antheris didymis. Petala indivisa. Styli 2. Capsula (v. 

 adlumns v. lilK-n,) hilocularis, birostris v. biloba, foramine inter rostra ipsisve lobis intus 

 longiiudinuliu-r dehisccus, p.lyspcrma. Semina : testa nucleo subconformi. 



Obs. Charactcrem in paucis mutatum structuram antherarum et seminum respicientem 



