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 194 CHLORTS MELVILLIANA.

Corymhi 7-10-flori, densi, folio florali sessili ssepe subteiisi, cseternm ebracteati. Cahjx glaber, sepalis sequalibus, ovatis, obtusis, modice concavis, trinerviis, extra medium piirpu- rascentibus, insertione pariim insequalibus. Petala alba, caljce sesquilongiora, ungues breves, lamince obovatae (vel ex ovali obovatse), obtusse, integerrimae, plange, obsolete iininervise, vix manifeste venosae. GlandvlcB receptaculi quatuor, per paria approximatee, latera filamentorum bre- viormii stipaiites, parvge. Stamina tetradynama. Filamenta subiilata, glabra, edentula, duo lateralia paulo breviora basi aversa (acie nee superficie plana ovarium spectanti). AnthercB uniformes, ovato-subrotundse, incumbentes, infra medium affixae, loculis parallelo-contiguis, longitudinaliter dehiscen- tibus. FolleM flavum, sphaericum, simplex quantum observare potui per lentem centies augentem. Ovarium sessile, glabrum, oblongo-ovatum, uniloculare, placentis duabus parietalibus polyspermis. Sfylus brevissimus vix manifestus. Stigma capitatum, indivisura v. simibilobum, stylo vix amplius. Siliqua (siliculosae) racemosae, erectae, lineari-lanceolatae, ancipites, glaberrimae, vix trilineares, stigmate obtuso indiviso subsessili apiculatae. Valvm carinatae, carina manifesta, venis immersis, cortice demum ad margines solubili, in disco arctius adherenti ; replum cortice pariter separabili. Bissepimentum, praeter basin apicemque ubi saepius completum, plerumque margo peran- gustus ad utrumque latus cujus processus membranaceus angustior e quo funiculi umbilicales brevissimi obtusi crassi papillaeformes orti. Semiiia immarginata, fusca, laevia. Cotyledones incumbentes, lineari-oblongae, plano-convexi- usculae, basi attenuata brevi in crure radiculari sita.

Obs. This species is named in honour of Mr. Edwards, Surgeon of the Hecla, from whose extensive and well-pre- served herbarium I have derived great assistance in drawing up the present list, and in which only perfect speciuieus with ripe sihquae of Eutrema Edwardsii were found.

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