250 THE JOURNAL OF BOTANY 
On the whole the evidence seems to point to the retention of 
Robbins’s name, as Tuckerman’s description does not fit that plant, 
but would do for an attenuate specimen of Claytonii, such as var. 
portoricensis Graebn. Mr. Fernald tells me that coe 
herbarium was divided into three parts. One is at Upsala, 
bie one at Cambridge, U.S.A.; the third has not yet been 
a. 
SPIRILLUS Tuckerman. With reference to my remarks in 
hi. Journal (1893, 295) it may be well, as an additional argument 
vour of using the name P. dimorphum Rafinesque, to refer to a 
Sesetoade: of “P. diversifolius Barton, Fl. Phil.; ponds on Long 
Island,” in herb. Schreber at Munich. This is certainly ae 
Tuckerm., not hybridus Michx. In 1890 I followed Am 
authors in referring diversifolius Barton to hybridus, but T! hid 
not then seen Barton’s Flora of North America, iii. t. 84 (182 
ILLUS L. n. subsp. ARGENTINUS. Differs from all known 
: AMERICANUS X P. PENSYLVANICUS. Dr. Hagstrém has 
found among some specimens I sent him one which he refers to 
the above hybrid. His calling my attention to this caused me to 
examine carefully my large series of americanus. believe two 
specimens gathered in New York and East Massachusetts by the 
late Dr. Morong belong here 
UGELII = P. a anus x lucens. Specimens gathered 
b el in 1849 in Florida, U.S.A. (ex herb. Brit. Mus.), and 
named lonchites by me in 1901, will, I now believe, prove to be the 
above hybrid. Other 2 ithe a irovii St. Mark’s, Florida, 613, 
Rugel, are Seay the 
Pox s L. f. LINEARIS = Syne, sub poly ir htt nF or 
Ireland pBunsingeion, 1874). - Ha ags trém refers to this as 
hybrid—* a very beautiful trish « one”; = P.natans L. x pen Set 
olius = P. gessnacensis Fischer in Mitt. Bayr. Bot. Gea Miinchen. 
Xxxvii. (1905), 472. He also thinks = _ from ‘“ Long Range, 
1888, R. W. ” may be the sam 
P. NITENS Web. var. PRELONGIFOLIUs Tis. Pot. Suec. Exsic. 
nos. 45, 46. Dr. Graebner (Das Pflanzenreich, 90) makes “ P. 
