1924] REHDER, NEW SPECIES, VARIETIES AND COMBINATIONS 49 



which must be credited to Sargent. The name, moreover, is not a valid 

 one, having been used for another plant in 1814 by Roxburgh. The 

 correct name for the Florida tree appears to be Ardisia escallonioides 



Mez, My 



naceae in Engler, Pflanzenr. IV.-236, 81 [1902]). 



NEW SPECIES, VARIETIES AND COMBINATIONS FROM 



VRIUM 



ARBORETUM 1 



Alfred Rehder 



Xolisma Raf. 



tn. Month. Mag. iv. 193 (1819).— Britton in 

 . 135 (1894).— Britton & Brown, 111. Fl. U. S. 



Mem. Torrey Bot. Club, iv. 135 (1894).- 



Can. ii. 569 (1897).— Small, Fl. S. E. U. S. 889 (1903); in N. Am. Fl. 



xxix. 65 (1914). 



Andromeda Linnaeus, Spec. 393 (1753), in part. 



Lyonia Nuttall, Gen. i. 266 (1818).— Sprengel, Syst. n. 291 (1825).— End- 



licher, Gen. 755 (1836-40).— De Candolle, Prodr. vn. pt. n. 599 (1839).— 



Bentham & Hooker, Gen. Pl.ii. 587(1876).— Drude in Engler & Prantl, Nat. 



Pflanzenfam. iv. 1, 44 (1889).— Fernald & Robinson in Gray's New Man. ed. 



7, 635 (1908).— Not Rafincsque (1808), nor Elliott (1817). 

 In 1819 Rafinesque proposed the name Xolisma for Lyonia of Nuttall 

 for the reason that the name Lyonia had been given by him in 1808 (in 

 Med. Rep. N. Y. v. 353) to another genus, but that name was only a new 

 name to replace Polygonella Michaux, which Rafinesque considered in- 

 appropriate; therefore it is not a valid name and will remain a synonym 

 of Polygonella. There is, however, another Lyonia proposed in 1817 

 by Elliott (Sketch Bot. S. C. I. 316 [1817] ) which antedates Lyonia of 

 Nuttall and is a valid name for a new genus based on Ceropegia palustris 

 Pursh {Cynanchum angustifolium Muhlb.) ; later the same genus was named 

 Seutera by Reichenbach (Consp. 131 [1828] ) and this name is taken up 

 by Small, as according to the Philadelphia Code Lyonia Elliott is invali- 

 dated by the older homonym Lyonia Rafinesque of 1808, but according 

 to the International Rules the latter name is not valid and therefore Lyonia 

 Elliott remains the oldest and valid name for the genus of Asclepiadaceae, 

 which makes it necessary to take up for Lyonia Nuttall the next oldest 

 name which is Xolisma. The type species of this genus is Lyonia fer- 

 ruginea Nuttall in which the character of the thickened sutures of the 

 valves is most pronounced and the thickened part separates from the rest 

 of the capsule, while in other species as in X. ligustrina, X. mariana, 

 X. lucida and X. ovalifolia the thickened part, though clearly perceptible by 

 its light color is apt to separate more irregularly from the rest of the valves 

 and does not hold together so firmly like a separate valve as it does in X. 



1 Continued from vol. iv- p. 253. 



