ZEXMENIA COSTARICENSIS 13 
hybrids and in spite of the almost unlimited number of variations 
- their sg omen manage to hold their own in nature is a problem 
ich has not yet been studied. Pending the solution of that 
iintenashiti seattar, it would be well if de sarees and Mendelians 
recognised that they have more to learn from each other than 
partisans on each side are at present Sanoded to admit 
ZEXMENIA COSTARICENSIS Benrts. 
By S. F. Buaxe, A.M. 
Linnzeus in the Hortus Mieeioaee (p-3 37)) as ‘“ Bidens 
foliis eae serratis, reget rage Bills with the habitat 
“« Amer No collector’s nai s given, but the species was 
based on "h specimen Gow 3 in the British Museum) sent to 
Linneus by Philip Miller which had been Lael ai Chelsea 
Garden from seed collected by Robert Millar in 1736 in Central 
America: Miller, redescribing it, gives the tooality 7s" Oarthagens,” 
by which eighteenth century collectors gop bas what is now 
called Cartago, not Carthagena in Columbia. On this specimen and 
reference was based the name Bidens pores L. in 1753. In 
the second edition of the Species Plantarum the specific name was 
transferred to Verbesina, and to the original citation from the 
Hortus Cliffortianus was added a second from Plumier,* “ Bidens 
frutescens, ilicis folio, flore luteo.”’ Plumier’s plate and deneatis 
tion apply to an entirely different plant, much more closely allied 
o true Bidens, may Na i a domingensis Cass.t In 1768 
rom collected by Sale Millar, calling it B. frutescens, and 
bate the ans synonym from sod “the Cliffortianus as 
nneus, but not mentioning B. r mod 
to say. “Miller also retains Verbesina Fite. L. in the cows 
sense of Linnzus, and with identical synonyms, Shitin sielaeeing the 
same citation from the Hortus Cliffortianus to species supposedly 
of two different genera 
ft o names, Bidens Seesinargero L. (Verbesina igen L. 
p. p.) and B. frutescens Mill., thus ted on almost identically 
the same material, have since bei sooner to ae different 
* Plum. Cat. 10 (1703) ; Pl. Amer. ats, Burm.) 42, t. 52 (175 9 
t Needhamia domingensis Cass. Dict. Sci. Nat. xxiv. 336 (1825), not 
Needhamia k. Br. ae el Nereis Cal ie. xxxviii. 17 (1825); Narvalina 
domingensis Cass C. Prod. v. 633 (1836). 
