172 DESCRIPTION OF SPECIES. 



APOCYNE^. 



APOCYNOPHYLLUM, Ung. 



Leaves very entire, pemiiiicrve, coriaceous; medial nerves stron^r; secondary 

 nerves very open or at right angles to the midrib, close together, camptodrome, some- 

 times separated by shorter intermediate thin veins. 



Apocyiiophylliim Scuclderi, sp. nov 



Plate XLV». Figs. 1-5. 



Leaves oblong-lanceolate, gradually narrowed upward to an acumen and down- 

 ward to a short petiole ; secondary veins nearly at right angles, numerous, camptodrome, 

 and curving quite near and along the borders as if joined to a continuous lateral nerve ; 

 intermediate tertiary nerves thinner, as long as the secondary ones; ncrvilles close, 

 oblique. 



The peculiar direction of tlie nerves, wliich in their curves follow the 

 borders, appearing like a continuous marginal vein, is also a character of 

 the leaves of some Myrtacece. The relationship of this species is, however, 

 more marked, not only by the nervation but by size and form of the leaves 

 with Apocynophi/llnm Helveticum, Heer, figured in "Bornst. Fl.,"" pi. iv, 

 figs. 1-7. The curving of the veins close to the borders is distinctly seen 

 (fig. 3) with the intermediate tertiary nerves, corresponding to fig. 4 of Heer. 

 The form of the leaves and their size being also the same, possibly the 

 American species is a mere variety. 



Hab. — Alkali Station. Professor Scudder. 



CONVOLVULACE^. 



PORANA, Burm. 



I have seen of this genus scariose calyxes, but, as yet, no leaves. 

 These calyxes, 3- to 5-lobate. have the sepals generally of unequal length, 

 free to the base, sometimes more or less connate. Two species only are 

 described by authors with calyxes and leaves, six from scariose calyxes, 

 all from the European Miocene. 



Poraiia Speirii, sp. nov. 

 Plate XXVIII, Fig. 15. 



Calyx scariose, somewhat thick, indistinctly five-lobate; lobes large, connate; 

 nerves diverging from the central point to the borders, traversed at right angles by 

 strong nervilles, forming equilateral meshes. 



The lobes are marked only by their upper borders being connate to 



