OF ARTS AND SCIENCES. 73 



usculis inappendiculatis basi coroUae et columnne longiusculae insertis 

 corolla dimidio brevioribus ; rosiro stigmatis gracili iutegerrimo mem- 

 braiiam aiitlierurum erectam pauUo superante. — Metai>telina? angusti- 

 fuliu/n, 'I'orr. Bot. Mex. Bouud. 159. Ravine at Santa Cruz, Sonora, 

 Mexico, very near tbe southern boundary of Arizona. Instead of 

 constituting a new genus for this species, it is here referred to the 

 extra-tropical South American genus Melinia, on account of the long 

 and slender beak to the stigma, corolla-lobes distinctly but narrowly 

 dextrorse-convolute, narrow sepals, &c. It is excluded from Oxypetalum 

 by the absence of any tooth" or appendage to the caudicles of the 

 poUinia. The corona is attached rather more distUictly to the corolla 

 than to the cclumn. and the pieces are wholly distinct and rather widely 

 separate ; but a slight ridge at the base of each is decurrent into a 

 slightly salient line on the column. The latter is about the length of 

 the body of the anthers, w^hich, again, bear a still longer erect mem- 

 brane, ovate-oblonoj in form. 



MetastiiLma Blodgetti. Eiimetastehna : caulibus filiformibus ; 

 foliis parvis anguste lanceolatis ; pedunculis 3-6-floris pedicillis 

 (lineam lonois) et petiolo brevioribus vel nullis ; corolke 5-partitae 

 lobis obloiigo-lanceolatis iutus sub apice peuicillato-barbatis : coronge 



A. LONGiFOLiA, Ell. Columna pauUo longiore ; ciicuUis ovalibus intejierrimis 

 inappendiculatis niarginibus ventralihus medio coluninte adnatis antlieris di- 

 midio brevioribus ; antiierarum alis senii-rliombeis basi niagis attenuatis. 



* * Gyiiostemiuni longius quam latum : cucuUi oblongi parum breviores, basi 

 bus columnam brevissimam tola longitudine obtegentibus : folia latiora saepe 

 opposita. 



A. LAXUGixosA, Decaisne. Als antherarum paullo infra medium latiores 

 subangulatai. 



A. viRiDiFLORA, Ell. AIsB autlierarum versus apicem latiores subangulatae, 

 basi longius angustatse. 



GOMPIIOCARPUS, R. Br. 



This genus is briefly defined as Asclepias without any crest or horn in the 

 hoods. E.xcept for two ai>pended Californian species, which technically belong 

 to it, it would be restricted to the Old World, mainly to Africa. 



G. TOMEXTOsus, Gray, Bot. Calif, i. 477 {Acerates lomentosa, Torr.),has wholly 

 tlie aspect and the structure of Asclefjias vestita, of the same region, except 

 as to the hoods, which are spreading or even depending, so that the (juasi- 

 bivalvular opening is superior or in appearance dorsal, giving a resemblance to 

 the structure in the plant which I named G. purpurascens, but am now obliged 

 to separate genericall y. 



G. coRDiFOLius, Benth., except for the want of horn, would be an Asclepias, 

 related to A. phytolaccoides. 



