SOUTH AMERICAN PLANTS. 87 



in the axis^ where they are connately disposed in an erect central 

 column, so that both lobes and segments may be said to have a 

 valvate sestivation : in Cesfranthus the lobes are reduced to short 

 teeth, but the segments of the corona are of considerable length, 

 linear and acute, and also valvately disposed in bud, int° a 

 lengthened pentangular cone, exhibiting at its basal angles the 

 five short lobes, as so many salient erect points. In Cardiomeriu 

 the lobes are equallyshort and similarly situated, but the very broad 

 emarginated segments have their margins valvately disposed/and 

 they are replicated lengthways down the middle, as in Datura, 

 so that the corolla appears in bud like a slender tube swollen 

 into a pentapterous form above, and terminated by five semi- 

 lunate wings, depressed at the point of their union in the axis, 

 and furnished on the external angles with the five salient short 

 erect lobes^ like so many uncinate teeth. 



Besides the considerations above described, we have the evi- 

 dence in the structure of the seed, that this genus must be 

 referred ta Solanacece^ and not to Scrophulanace(2, because the 

 embryo, which is slightly curved, has its radicle pointed to the 

 basal angle of the seed, and turned away from the ventral hilura, 

 as shown by Gaertner (De Fruct. tab. 214), while in the latter 

 family the radicle always points to the true point of origin of the 

 hilum. Schwenhia, like Vestia, has a stipitate ovarium, the 

 support being enclosed in its hj^ogynous disk, and the corolla 

 also falls away by a circumscissile line above its base, forming a 



anum 



placentation likewise resembles that of Fabiana^ the points of 

 attachment of the ovules being placed in seveml prominent lon- 

 gitudinal lines; the seed in a similar manner is slightly curved 

 and hollow on its ventral face, the hilum being seen in this 

 hollow. 



ScHWENKiA, Linn. — D.C. Prodr. x. 192. — Chpetochilus, ValiL 

 Enum, i. 102. — Mathea, VelL FL Fium. L tab. 51 — (Charact. 

 emend.). — Calya: tubulosus, 5-dentatus, vel semi-5-fiduSj la- 

 ciniis sublinearibus, prsefloratione valvatis, persistens. Corolla 

 monopetala, tubo elongato cyhndrico, rarius supra medium 

 infundibuliformi, ssepissime gibbosim subinflato, ore con- 

 tracto, et hinc in lobos 5 glanduliformes producto, lobis erectis, 

 lineari-teretibus setiformibus subsequalibus, aut ina^qualibus 

 et clavatis, vel ad dentes minutos mucroniformes redactis, 

 fauce corona limbiformi rotata 5-partita instructo, segmentis 

 sen brevibus et dentiformibus, vel oblongis, integris, acutis, 

 expansis, lobis multo longioribus, aut truncato-oblongis, emar- 

 ginatis, bifidisve, et tunc ssepe sesc longitudinaliter retro- 

 plicatis, lobis segmentisque sestivatione valvatis. Stamina 5 



