OF ARTS AND SCIENCES. 159 



XIV. 



CHARACTERS OF SOME LITTLE-KNOWN OR NEW 

 GENERA OF PLANTS. 



By Asa Gray. 



Read May 9, 1877. 



CANOTIA, Torr., Genus Rutacearum. 



Flores hermaphroditi. Calyx parvus, qiiinquelobus, persistens ; 

 lobis latis sestivatione imbricatis. Petala 5, hypogyna, oblonga, utrin- 

 qiie obtusissima, basi lata iuserta, aestivatione imbricata, intus medio 

 costa prominula instructa, decidua. Stamina 5, hypogyna, calycis lobis 

 opposita : filamenta subulata, petalis parum breviora, persistentia : 

 antherje oblongo-cordatae, introrsae, sinu profiindo apici acutissimo 

 filamenti affixis, mucrone parvo apiculataj ; localis iutus longitudi- 

 nallter deiiisceiitibus. Pollen madidum tricorne. Discus iiullus. Ova- 

 rium gynobasi crassa eoque multo ranjore inferne leviter 10-sulcata im- 

 positum, o-loculare, stylo crasso demum elongando superatnra : stigma 

 parvum, leviter 5-lobum ; loculis ovarii oppositipetalis. Ovula in 

 loculis saepissirae 6, angulo iuterno biseriatim inserta, subhorizontalia ; 

 micropyle int'era. Capsiila ovato-fusiformis, lignescens, epicarpio tenui 

 subcarnoso induta, 5-locularis, ab apice 10-valvis (primum septicida, mox 

 loculicida), portionibus styli persistens 10-fissilis superatis ; columella 

 nulla. Semina in loculis solitaria vel bina loculum implentia, adscen- 

 dentia, subovata, complanata ; testa subcoriacea creberrime papillulosa 

 inferne in alam latam membranaceam nucleo sublongiorem producta. 

 Embryo in strato tenui albuminis carnosi rectus ; cotyledoiiibus ovali- 

 bu3 planis ; radicula breviuscula, infera. — Arbuscula 10-'20-pedalis, 

 prorsus apliylla. glaberrima ; ramis alternis spartioideis viridibus rigidis 

 nunc spiuesceutibus striatulis cicatricibus parvis remotis brunneis 

 notatis ; inflorescentia secus ramulorum racemiformi ; pedunculis bre- 

 vissimis fasciculatim vel cymoso-3-7-floris ; pedicellis articulatis ; brac- 

 teis parvis squamiformibus ovato-subulatis oppositis deciduis ; corolla 

 alba; glandulis ordinis evanidis. 



