OF ARTS AND SCIENCES. 89 



with short and very stiff backwardly hooked bristles ; the burr closing 

 on the ventral side, and completely covering a fertile nutlet : the other 

 nutlet is free, and is certainly sometimes fertile, but more commonly, 

 although enlarging, it seems to fail to mature a seed. The adaptive 

 character of this little plant, viz., the transference of the burr-like 

 apparatus for the dissemination of the seed from pericarp to the calyx, 

 and the investment by the latter of only one of the two ripening 

 nutlets, is most remarkable. The habit is that of Pectocarya, with 

 which it is associated upon the island ; but the structure is very dif- 

 erent. 



"^ECHIDIOCARYA, Nov. Gen. Borraginacearum. 



Calyx 5-partitus ; segmentis' linearibus, fructiferis laxis. Corolla 

 infundibuliformis, sub fauce nuda parum constricta, lobis asstivatione 

 imbricatis. Filamenta brevissima : anther* oblonsfa3. Ovarii lobi 

 gynobasi vix elevati^ impositi : stylus brevis : stigma didymum. Nu- 

 culte 4, lataj, ovato-pyramidatce, inermes, subrugoso-muriculatK, dorso 

 ventroque carinulatse, carina ventrali apice breviter producta, areola 

 basilari late concava in stipitem longe producta, sti pi tibus infra medium 

 per paria connexis introrsum apertis gynobasin conicam claudentibus ; 

 cicatrice lata excavata post nuculas delajisas in gynobasi relicta. 

 Semen breve, leviter curvura : cotyledones latoe subplanje. — Herba 

 annua, diffusa ; foliis (oblongo-linearibus) floribusque Eritrichii sect. 

 Plagiohothridi referentibus, corolla parva alba vel cterulescente. 

 (Char, maxima ex parte e Benth. & Hook. Gen. PL 2, p. 854, adhuc 

 ined.). ** 



EcHiDiocARYA Arizonica. — Verde Mesa, Arizona, Dr. Smart. 

 '^ Convolvulus (Calystegia) occidentalis. Aut glaber, aut 

 minute pubescens, volubilis ; foliis nunc ovato-triangularibus sinu 

 profundo angusto nunc lanceolato-hastatis immo lineari-sagittatis, lobis 

 posticis sfepe 1-2-dentatis ; pedunculo elongate intra bracteas ovatas 

 vel oblongas quandoque bifloro ; corolla alba vel erubescente, limbo 

 lato ; stigmatibus fere linearibus. — Common throughout the western 

 part of California, on and near the coast. Tlie more luxuriant and 

 broader-leaved forms so much resemble C. sepium that only the shape 

 of the stigmas surely distinguishes them. But I have never seen 0. 

 septum with a second flower, while this often has two, and rarely even 

 three from the pair of bracts. The Californian species abundantly 

 confirm Mr. Bentham's remark in the Flora Australica, that the char- 

 acters of Calystegia are too artificial, and it may now be added too 

 transitional, to warrant the adoption of the genus. 



