238 
HARLEY HARRIS BARTLETT 
Key to Cruciate Onagrae Discussed in this Paper 
Free sepal tips distinctly infraterminal, i. e., separated in bud. 
Free sepal tips very densely pubescent with appressed, sharp 
hairs. 
Free sepal tips thinly pubescent, not markedly more so than 
the upper part of the bud. 
Main stem and basal branches with numerous lateral 
flowering branches. Hairs of calyx segments below 
free tip of two types, cylindrical and acute. 
Main stem and basal branches simple below the inflores- 
cence. Hairs of calyx segments below free tip all 
cylindrical. 
Free sepal tips terminal, i. e., appressed to one another at the base 
in bud. 
Main stem bearing either a flowering branch or a flower in 
every axil. 
Main stem with a few flowering branches below the terminal 
spike, which pass gradually into abbreviated non-flowering 
branches toward the middle of the stem. 
Oenothera cruciata Nutt. 
The specimen in Herb. Phil. Acad, appears to be identical with the 
specimen in Herb, de Candolle (v. figure i). It consists of the ter- 
minal part of a large branch (or main stem?) bearing one flowering 
branch in the lowest axil. Stem red on side exposed to the sun, other- 
wise green, with ^^pubescence of two types, — long spreading or ascend- 
ing sharp hairs mostly red-tuberculate at base and a thin scarcely 
visible indument of short, acute, crispate hairs. Upper leaves lanceo- 
late, distantly repand-denticulate, broadest near the base and tapering 
to the acute or acuminate apex, somewhat pubescent on both sides with 
appressed sharp hairs. Bracts of the inflorescence lanceolate, broadest 
near the middle, upper ones with some hairs of the cylindrical, thin- 
walled, round pointed type. Hypanthium about 33 mm. long, very 
slender, densely puberulent with cylindrical hairs and sparsely pilose 
with long, sharp hairs. Calyx segments lo-ii mm. long, puberulence 
more sparse than on hypanthium and pilosity more dense: free tips 
about 2 mm. long, densely appressed-pilose, distinctly infra-terminal 
and well separated in bud. Buds somewhat clavate. Ovary 7-8 mm. 
long, with both the short, C3dindrical and long, sharp, hair types. — 
Massachusetts, Nuttall, 1825. 
Oe. cruciata. 
'Oe. venosa. 
Oe. atrovirens. 
Oe. biennis. 
var. leptomeres. 
Oe. stenomeres. 
