354 PROCEEDINGS OF THE AMERICAN ACADEMY 



§ 2. Anthei'ce ovales, retusce, medio affixce : injlorescentia spicata, 



Jlorihus minimis : stigmata ultra indusium haud vel vix pro- 



dueta. 



13. G. PAKVIFLORA, Dougl. Caule pilis longis pateutibus villoso ; 



foliis utrinque adpresse velutinis ciliatis ; indusio quadripartito, lobis 



basi dilatatis ; fructu oblongo sessili velutino valde obtusangulo inter 



angulos unicostato. — Head-waters of the Platte to Louisiana and 



Texas. — Wallawallali, Oregon, Douglas, ex Hook. Fl. Bor.-Ara. 



HETEROGAURA, gen. nov. 



Calycis tubus brevis, obconicus. Stamina erecta, 4 petalis alterna 

 fertilia anthei-is ovato-cordatis retusis ; 4 petalis o^Dposita breviora 

 fere ananthera, antlieris abortivis lanceolato-cordatis acutissimis : fila- 

 inenta clavata, exappendiculata. Stylus stamina adsequans : stigma 

 disciforme integerrimum, indusio nullo. Ovarium 4-loculare ; loculis 

 uniovulatis. Fructus ovato-gibbosus, 2 - 4-locularis, abortu 1- (vel 2?-) 

 spermus. — Herba annua, erecta, superne paniculato-ramosa. Folia 

 subintegerrima vel parce obsolete sinuato-dentata ; inferiora petiolata, 

 lanceolata ; superiora lanceolata-linearia, sessilia vel subsessilia. Ova- 

 ria (cum ramulis junioribus) puberula. 



H. Californica. Gaura heterandra, Torr. in Pacif. R. R. Re- 

 ports, 4. p. 87. — Mokelumne Hill, California, Dr. J. M. Bigelow, 

 May. — Plant one or two feet high, and with habit entirely different 

 from Gaura, rather that of Clarkia. 



Five hundred and tliirty-eiglith Meeting. 



September 13, 1864. — Adjourned Statute Meeting. 



The President in the chair. 



Colonel J. D. Graham, of the Corps of Engineers, U. S. 

 Army, in alluding to the semi-diurnal lunar tide lately dis- 

 covered by him in Lake Michigan, and published in his Re- 

 ports from 1858 to 1863, remarked, that while in charge as 

 Superintendent of the Survey of the Northern and North- 

 western Lakes, he had instituted a series of observations for 

 the 'purpose of ascertaining, with accuracy, the extent of the 

 similar tide in Lake Huron. 



