82 Rhodora [May 
for the writer near Flint, Michigan. Because neither the strain from 
Havre de Grace nor that from Flint has been used in experimental 
work, it seems best to designate the strains from Ithaca as types of 
Oenothera nutans and Oenothera pycnocarpa. Only thus is it possible 
to insure the unquestionable applicability of the names which will be 
used shortly by Prof. Atkinson in reporting on his hybrids, since the 
Ithaca strains may, when grown side by side with those from Mary- 
land and Michigan, show characteristics which one would fail to 
detect in herbarium specimens. Even in the vicinity of Ithaca there 
are forms of dubious identity with Oenothera pycnocarpa which indicate 
the propriety of taking every precaution in designating the type of 
this species. It may therefore be understood that the types of Oe. 
nutans and Oe. pycnocarpa described below are specimens collected 
at Ithaca and preserved in the Cornell University Herbarium. The 
descriptions have been drawn up from portions of the types in the 
writer's collection and from notes on the Cornell cultures and speci- 
mens kindly supplied by Prof. Atkinson. 
OENOTHERA ANGUSTISSIMA Gates. Biennis. Rosula autumnalis 
compacta depressa viridis, hieme rubescens; foliis planis acutis 
auguste oblanceolatis 10-19 cm. longis, 2-2.5 cm. latis, utrinque 
exigue et minutissime puberulis, nervis margineque rubris, lamina 
plerumque sine maculis rubris, exterioribus longe petiolatis, et, prae- 
cipue infra mediam, valde sinuato-dentatis. Planta matura 0.5- 
1 m. alta, parte inferiore vel simplex vel ramos cauli primario similis 
sed tertia parte humiliores ferens, superne usque ad inflorescentiam 
ramis axillaribus vel abbreviatis vel rosulatis praedita. Caulis ruber 
teres minutissime pilis curvatis acutis verrucosis, pluribus brevissi- 
mis, paucis aliquantum longioribus puberulus. Folia sinuato- 
denticulata utrinque subglabra autumno ignicantia, apice basique 
acuta, anguste lanceolata, inferiora ca. 13 em. longa, 17 mm. lata, 
brevipetiolata, superiora 5 em. longa, 8 mm. lata, sessilia. Inflores- 
centia juvenalis propter rubros calycum apices spectabilis, e spicis 
terminali aliisque lateralibus brevioribus composita. Bracteae per- 
sistentes foliorum modo superiorum obscure denticulatae, 3—4 cm. 
longae, 4-6 mm. latae, floribus 5-6 cm. longis superatae, apice acu- 
minatae, basi valde rubrotinctae, obtusae vel rotundatae. Ovarium 
10-12 mm. longum, sub lente pilis erectis apice rotundatis viscido- 
puberulum. Hypanthium 25-30 mm. longum etiam viscido-puberu- 
lum. Calycis segmenta nondum explicata gemmam quadrangulam 
20 mm. longam 4 mm. crassam apicibus liberis rubris distantibus 
infraterminalibus 3-4 mm. longis coronatam formantia, ad basin 
versus solum exigue viscido-puberula, sed apicem rubrum versus 
pilis sparsis longioribus curvatis acutis praedita. Petala flava propter 
