TRIBE I. ASTR^EACEA. 325 



Red Sea. Ehrenberg. 



This description is from Ehrenberg. The species appears to be 

 near the formosa, but grows very differently. Ehrenberg mentions 

 that it attains a height of six inches. 



Pavonia cactus, Ehrenberg, op. cit. G. Ixv. Pavonia cactus, Lamarck, 2d ed., ii. 378. 

 sp. 3. No. 4 a. 



6. PAVONIA PR^TORTA. (Dana.) 



P. cespitoso-hemispherica ; foliis gradllimis, bifrontibus, lobato-subdivisis, 

 undique valde crispis et intortis. Corallum foliis tenuibus (infra 

 1-1J'"), margine fere papyraceis, oririmis minutis (vix J'"), scepius 

 transversim subseriatis cum interstitiis vix minime convexis ; lamellis 

 subtilissimis, confer tissimis, alternis vix minoribus. 



Cespitoso-hemispherical ; folia bifacial, delicate, and lobato-subdivided, 

 every where strongly crispate and contorted. Corallum with the 

 folia quite thin (below 1 to 1 lines), at the margin, nearly like 

 paper in thickness ; oririmes minute (scarcely J a line), mostly in 

 imperfect transverse series, with the interstices scarcely at all 

 convex ; lamellae very delicate and crowded, the alternate but little 

 smaller. 



Plate 22, fig. 5, part of a clump, natural size; 5 a, a separate folium. 



Tahiti, Society Islands. Exp. Exp. 



The hemispherical clumps of this species, consist of gracefully 

 turned leaves, closely aggregated, and contorted in every direction, 

 and very thin at the margin (hardly a fourth of a line for a fourth of 

 an inch from the summit). The oririmes are much smaller than in 

 the following species, to which it has some resemblance. This species 

 and the following were obtained at Tahiti, by William L. Hudson, 

 Esq., commander of the ship Peacock. 



7. PAVONIA FORMOSA. (Dana.) 



P. cespitoso-hemispherica ; foliis gracilibus, bifrontibus, lobato-subdivisis, 



82 



