Bartlett,— Systematic Studies on Oenothera,—V 43 
apicem versus sensim angustati, minute viscido-puberuli, pubescentes, 
et sparsim tuberculato-pilosi, tuberculis viridibus; apicibus productis 
brevissimis truncatis vel paululo emarginatis.— Cultivated from seeds 
collected at Jaffrey, New Hampshire, by B. L. Robinson; garden speci- 
mens, Bartlett 3505, 3509, 3517, 3669, 3670. Oc. Robinsonii differs 
from Oe. venosa chiefly in the smaller size of the former, in the more 
sharply dentate leaves, the narrower bracts, the dense erect viscid 
puberulence of the longer, more slender buds and the shorter calyx 
tips. Most of these differences are obscure in herbarium material. 
The range of variation in bud length, for example, overlaps in the 
two species. Nevertheless the difference is striking enough in plants 
cultivated under identical conditions, as were those shown in Plate 
EET 
Oenothera cleistantha Shull & Bartlett sp.nov. Biennis. Rosulae 
folia oblanceolata, ad petiolum versus distanter et acute sinuato-den- 
tata, maxima ca. 270 X 30 mm. Planta matura ca. 1 m. alta ex caule 
proprio obliquo et 10-15 ramis radicalibus constans. Caulis proprius 
infra inflorescentiam ca. 7 dm. longus, dense foliosus et ramosus, ramis 
9-100 mm. longis, solum longioribus autumno vergente floriferis; 
inflorescentia terminalis 3-4 dm. longa, sublaxa, simplex vel spicis 
1-4 lateralibus brevibus praedita, juventate paululo nutans, aetate 
erecta. Rami radicales late patentes, caule proprio longiores (ca. 
13-14 dm. longi) infra medium ramis 5-15 tertiariis floriferis, maximis 
6 dm. longis praediti, sursum solum ramulos brevis foliosos non flori- 
feros ferentes. Caulis coloribus viride et rubro maculosus, crispato- 
pubescens et tuberculato-pilosus, tuberculis cauli concoloribus. Folia 
laete viridia, utrinque minute crispato-pubescentia, inferiora ca. 
140 X 28 mm., media 100 X 22 mm.  Bracteae patentes, inferiores 
foliosae lanceolatae ca. 42 X 13 mm., superiores fructibus dimidio 
longiores. Hypanthium gracillimum 33-36 mm. longum, 1.5 mm. 
crassum, sparsim patenter pilosum et viscido-puberulum. Flores 
saepissime cleistogami. Calyx proprius inexpansus subquadrangulus 
14 mm. longus, 4 mm. crassus, pilis viridi-tuberculatis longis, prope 
hypanthium vel reflexis vel erectis, prope apicem ascendentibus; 
apicibus liberis basi distantibus, 3 mm. longis, parallelis. Petala 
10 mm. longa, 2.5 mm. lata. Stigma antheris circumdatum. Ovari- 
um 1l X 2.5 mm., dense pilosum et puberulum, pilis triformibus, I 
longissimis tuberculatis albis ascendentibus, II brevibus acutis crispa- 
tis, III brevissimis viscidis erectis. Fructus virides 30 mm. longi, 
prope basin 6.5 mm. crassi, apicem versus angustati, pubescentia 
ovario similes, subscabri, pilorum tuberculis viridibus; appendicibus 
productis 1 mm. longis, emarginatis.— Grown from seeds collected 
by Dr. Geo. H. Shull at Huntington, Long Island, N. Y.; garden 
specimens Bartlett 3511, 3557, 3592, 3646. The extreme leafiness and 
dense branching of this species are among its most striking characters. 
A more minute but very distinctive characteristic lies in the long 
hairs of the calyx, which are retrorse or perpendicular around the top 
boss 
