OF ARTS AND SCIENCES. 107 



spirillifera. — In sand at Deseret, S. Utah, June 16, 1880, Marcus E 

 Jones. Most related to G. pumila and G. poh/cJadon, which are am- 

 biguous between the Elaphocera and the Eiigilla sections. Tlie slight 

 irregularity in the depth of the sinuses of the corolla is of little 

 account. 



REVERCHONIA, Nov. Gen. Euphorhicearum. 



Phyllanthea, Phyllantho affinis, verum-tamen antheris introrsis, ovu- 

 lis amphitropis, semiuibus adscendentibus, cotjledonibus Stenolobi- 

 earum angustis. — Flores dioici et monoici. 3Iasc. Calyx 4-partitus ; 

 segmenta spathulato-oblonga, subherbacea, sestivatione leviter imbri- 

 cata. Discus obscurus. Stamina 2, sepal is totidem opposita : filamenta 

 brevia, distincta : antherae immutatse, introrsse, loculis contiguis paral- 

 lelis longitrorsum dehiscentibus. Eoem. Calyx 6-partitus ; segmenta 

 maris similia. Discus pateriformis G-crenatus. Ovarium triloculare ; 

 styli breves, discreti : stigmata brevia, crassa, emarginato-biloba. 

 Ovula in loculis geraina, amphitropa, medio inserta. Capsula trilocu- 

 laris, globosa, primum subcarnosa, demum in coccos bivalves dissiliens. 

 Semina in loculis bina, supra basim hilo parvo inserta, adscendenti- 

 erecta, sectione transversa trigona dorso convexa, estrophiolata ; testa 

 Crustacea. Embryo in albumine carnoso parum incurvus, teres ; radi- 

 cula supera, gracilis, cotyledonibus angustis parum latioribus longior. 



Reverchonia arenaria. Herba annua, parvula, glabra, patentim 

 ramosa ; foliis alternis brevi-petiolatis oblongis vel angustioribus in- 

 tegerrimis crassiusculis (semi-sub-pollicaribus) ; stipulis lato-subulatis 

 scariosis ; floribus foemineis brevipedicellatis aut in axillis solitariis 

 aut in plantis androgynis singulo in fascicule , paucifloro pi. masc. ; 

 perianthio viridulo demum purpurascente. — Sandy river-banks of 

 W. Arkansas and N. W. Texas. Sand-hills along the Canadian, Dr. 

 J. M. Bigelow, Sept. 10, 1853. Sand-hills of the Brazos, Baylor Co., 

 Texas, Julien Reverchon, September, 1879. 



Of this interesting plant, both collectors obtained only the female 

 plant, and in fruit. But Mr. Reverchon has raised a plant or two from 

 seed. The latter prove to be sometimes monoecious and androgynous. 

 The late Dr. Torrey had ascertained the carpological characters, 

 except as to the embryo, from Dr. J. M. Bigelow's specimens. The 

 rediscovery enables me to complete the character, and to establish 

 on it a new genus ; which, with great satisfaction, I dedicate to M. 

 Julien Reverchon, of Dallas, Texas, the second discoverer, — a valu- 

 able correspondent, an acute and sedulous botanist. 



The relationship of this plant to Phyllanthus is so close, that, were 



