350 PROCEEDINGS OF THE AMERICAN ACADEMY 



Stamina conformia, declinata: filamenta basi intus appendice squamas- 

 formi aucta : antlierce sa?pissime lineari-oblonga?. Stigma quadriparti- 

 tum, indusio vel adnato vel fere libero cinctum. Ovarium 4- (quan- 

 doque 3-) loculare, loculis 1- (in alternis raro 2-) ovulatis. Fructus 

 dissepimentis evanidis unilocularis. 



2. STENOSIPHON, Spach. Calycis tubus filiformis. Stamina 

 conformia, declinata : antherte ovales, medio atfixa3 ; filamenta tenuis- 

 sima, exappendiculata. Stigma quadripartitum, indusio peltato basi 

 loborum adnato (inter lobos pi. m. involuto) suffultum. Ovarium 

 (dissepimentis nuUis) uniloculare, 4-ovulatum. Fructus abortu mono- 

 spermus. 



3. HETEROGAURA, nov. gen. Calycis tubus brevis, obconicus. 

 Stamina erecta, 4 petalis alterna fertilia antheris ovato-cordatis ; 4 

 petalis opposita fere ananthera breviora : filamenta exappendiculata. 

 Stigma disciforrae, integrum : indusium nullum. Ovarium 4-loculare, 

 loculis uniovulatis. Fructus obovato-gibbosus, 2-4-locularis, abortu 

 mono- (vel di?-) spermus. Vide infra. 



Respecting Stenosiphon (still of a single species), I have nothing 

 to add. The species of Gaura I have endeavored to define mainly by 

 the flower and fruit. As to the latter, it must be remarked that only 

 the mature or nearly mature fruit is of much account in distinguishing 

 the species ; and in the following characters the ripe fruit is to be 

 understood as in view, except where it is otherwise specified. The 

 young or forming fruit is quite too variable. 



The characters of our species derived from the fruit may be briefly 

 presented in the following tabular key. 



Fructus sessilis vel subsessilis (i. e. flores spicata) : 

 usque ad basim tetraqueter, quandoque triqueter, 



pyramidatus, glaber, angulis acutissimis, faciebus in sicco plus minus cor- 

 rugatis. G. tripetala, G. suffulta. 



oblongus, glaber, Isvis, angulis acutissimis. G. Lindheimeri. 



oblongus seu ovatus, pubens vel puberulus, 



acutissime angulatus, utrinque acutus. G. angustifolia. 



obtusiuscule angulatus, subcanescens, parvus. G. longiflora. 



obtusiuscule angulatus, velutino pubescens (3-4 lin-longus). G. biennis. 



basi teretiuscula sensim breve attenuatus, superne obtusanguius. G. parviflora. 



infra medium in coUum teres subito contractus, superne pyramidatus, 



canescens, collo crasso. G. Drdmmondii. 



glaber, collo tenui. G. coccinea. 



