1923] Wiegand,— Triosteum perfoliatum and Related Species 199 
CHANGES OF NaMEs: Ricciella crystallina, R. fluitans, R. mem- 
branacea and R. Sullivantii (of the first Revised List) are replaced in 
the genus Riccia (XVII, 74); Neesiella pilosa and N. rupestris are in- 
cluded in the genus Grimaldia (XVII, 75); Fossombronia salina is 
superseded by F. brasiliensis (XVII, 75); Plagiochila Sullivantii (of 
list) is now P. Austini (XI, 68); Calypogeia tenuis is now C. paludosa 
(XII, 119); Cephalozia serriflora again becomes C. catenulata (XII, 
112); Diplophylleia albicans, D. apiculata and D. taxifolia are placed 
in the genus Diplophyllum (XI, 74); Scapania gracilis (of list) is in- 
cluded under S. nemorosa (XIII, 75); Porella rivularis (of list) is 
included under P. platyphylla (XII, 109). 
YALE UNIVERSITY. 
NOTES ON TRIOSTEUM PERFOLIATUM AND 
RELATED SPECIES. 
K. M. WIEGAND. 
For many years the Triosteums of Central New York have given 
trouble to botanists. In 1918 the writer described a variety from 
this region (var. glaucescens, RHODORA xx. 116) but this did not en- 
tirely solve the difficulty. Two large and thrifty patches of the 
smooth-leaved type were found nearly 25 miles apart in which some 
individuals had broadly perfoliate leaves while the leaves of others. 
in the same patch were entirely separate at the base. A careful com- 
parison of various features of the leaves, flowers, and fruits, character 
by character, showed absolutely no other difference. "These per- 
foliate-leaved plants could scarcely be interpreted as hybrids of 
T. perfoliatum and T. aurantiacum as only one other collection of 
plants with perfoliate leaves has been made in the entire basin of 
Cayuga Lake. "This perplexing situation has led to a study of the 
whole group at the Gray Herbarium and through several seasons at. 
Ithaca. 
In his original paper on T. aurantiacum Bicknell! gave twenty-five 
differences between T. perfoliatum and T. aurantiacum. In this 
paper T. perfoliatum was said to differ from the latter species as 
follows: (1) the principal leaves strongly perfoliate instead of separate; 
1 Torreya i. 25 (1901). 
