48 Rhodora [Marcu 
excellently prepared, shows a robust plant in mature fruit, with culms 
very palpably triangular and involucral leaves divergent —-Scirpus 
mucronatus, perfectly characteristic in every way. 
There is no material of this collection in the Herbarium of the 
Philadelphia Academy (where there are many Martindale duplicates), 
at the University of Pennsylvania, or presumably at New York or 
Cambridge, so it may be safely concluded that this occurrence of S. 
mucronatus at Camden was probably even more casual than the gen- 
erality of ballast plants — many of which, although persisting only a 
season or two, at least originally occurred in such numbers of indi- 
viduals as to be well, if not overly, represented in many herbariums. 
Scirpus mucronatus at Camden may be noted as a matter of historical 
record, but thus only. 
ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA. 
NOTES ON THE CLAYTON HERBARIUM. 
S. F. BuaKe. 
(Continued from page 28.) 
4. Dioscorea villosa L. Sp. ii. 1033 (1753).! In his recent revision 
of North American Dioscorea Bartlett (Bull. Bur. Pl. Indus. No. 
` 189. 6-10, 15 (1910)) has displaced this name by D. paniculata Michx. 
on grounds which do not seem to me sufficient for the overthrow of the 
Linnaean name. Although the Linnaean species is certainly a com- 
plex, as Bartlett has clearly pointed out, it is by no means more likely 
to be a “source of permanent error and confusion” than are scores of 
Linnaean names today kept up by practically all authors. The only 
element in the published description determinable in the light of 
present-day knowledge is Clayton’s number 94, which is D. paniculata 
1 Dioscorea villosa. 
“7. DIOSCOREA foliis cordatis alternis oppositisque, caule laevi. 
“ Dioscorea foliis cordatis acuminatis: nervis lateralibus ad medium folii terminatis. Gron. 
virg. 121. 
“ Bryoniae similis floridana, muscosis floribus quernis, folliis subtus lanugine villosis: medio 
nervo in spinulam abeunte. Pluk. alm. 46. t. 375. f. 5. 
“ Habitat in Virginia, Florida.” 
