OF ARTS AND SCIENCES. 187 



The Polemoniaceje, Gilia incisa, Benth., before known in Mexico as 

 far south as Monterey (235, 250) ; Lceselia coccinea, Don (381). 



The Hydroleacese, Hydrolea spinosa, L. (128) ; Mama Jamaicensis, 

 L. (189) ; and Wigandia macrophylla, Cham. & Schlecht. (155), the 

 latter apparently a good species. In De Candolle's Prodromus, for 

 "foliis plusquam polHcaribus," we should read " foliis plusquam 15- 

 pollicaribus." 



The Convolvulacefe are Galonyction speciosum, Chois. (350) ; Jac- 

 qnemontia hirsuta, Chois. (157'') ; and Evolvulus linifolius, L. (169). 



The Gentianacete, Eustoma exaltatum, Griseb. (259, 315) ; and Ery- 

 thrcea Chilensis, Willd. ? (186, 265), doubtless the Mexican plant of 

 Hartweg's collection, but probably not the Chilian ; the collector notes 

 the flowers of 265 as golden-yellow. 



The Apocynaceaj are Rauwoljia heterophylla, R. & S., var. puberula 

 (374) ; the smooth variety of Thevetia Yccotli, DC, but with the veins 

 of the leaves nearly inconspicuous (327) ; an Echites ? in flower only 

 (240), and another species, an Amblyanthera of Miiller Argov., appar- 

 ently a new species, in foliage, calyx, and very torose slender fruit very 

 much resembling E. tenuicaidis of Spruce from the Amazon (a variety 

 o^ Amblyanthera versz'eo/or, M till . Argov.), but the leaves are pubescent 

 beneath, and with a deeper basal sinus, the cqrolla only half as long, its 

 tube fusiform, the throat above the constriction not wider than the body 

 below, a squamula under each lobe of the calyx (217) ; also 



Prestonia Mexieana, A. DC. (127). In addition to the flowering 

 specimens, we have in the collection a pair of follicles of this species, 

 which help to complete the generic character. They are quite different 

 from those of Hcemadictyon, as described by Miiller in the Flora Bra- 

 siliensis, but more like those of JI.? Alexicana, as described by De 

 Candolle from Mogino and Sesse's figure. They may be thus char- 

 acterized : Folliculi oblongo-conici, 3-pollicares, basi fere pollicem lati, 

 prurienti-hirsutissimi, pericarpio crasso. Semina oblonga, sursum at- 

 tenuata, apice comosa, testa fere suberosa. 



The common Asclepias Cwassavica, L. (132), represents its order, 

 along with a plant which must be Sarcostemma elegans, Decaisne. 

 But the leaves are rather broadly cordate or oblong-cordate, and tipped 

 with a conspicuous cusp, the lobes of the corolla minutely puberulent 

 within (174). 



But the most interesting plant of the collection, and for which I 

 am now enabled to complete the character, is the 



