OF ARTS AND SCIENCES. 89 



with short aud very stiff backwurdly hooked bristles ; the burr clo.siii;^ 

 on the ventral side, and coni[)letely covering a fertile nutlet : the other 

 nutlet is free, aud is certainly sometimes fertile, but more comuioidy, 

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

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

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

 aud the investment by the latter of only one of the two ripenirig 

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

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

 erent. 



ECIIIDIOCARYA, Nov. Gen. Borraginacearum. 



Calyx 5-partitus ; segmentis linearibus, fructiferis lax is. Corolla 

 infundibuliformis, sub fauce nuda parum constricta, lobis aistivatione 

 imbricatis. Filamenta brevissima : antheriB oblongai. Ovarii lobi 

 gynobasi vix elevata; impositi : stylus brevis : stigma didymum. Nu- 

 culie 4, lataj, ovato-pyramidataj, inermes, subrugoso-muriculatie, dorso 

 ventroque carinulatte, 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 excava'a post nuculas delapsas in gynobasi relicta. 

 Semen breve, leviter curvum : cotyledoues latai subplanae. — Ilerba 

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

 Plagiohothridi referentibus, corolla parva alba vel ca^rulescente. 

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

 ined.). 



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



Convolvulus (Calystegia) occidentalis. Aut glaber, aut 

 minute pubescens, volubilis ; foliis nunc ovato-triangularihus sinu 

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

 posticis soepe 1-2-dentatis ; pedunculo elongato intra biacteas ovatas 

 vel oblongas quandoque bifloro ; corolla alba vel eruhescente, limbo 

 lato ; stigmatibus fere linearibus. — Common throughout the western 

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

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

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

 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 Cahjstecjia are too artificial, and it may now be added too 

 transitional, to warrant the adoption of the genus. 



