Two new plants from western Colorado 
_ Gro. E. OSTERHOUT 
’ Nuttallia marginata sp. nov. 
Seemingly a biennial, the stem 3 dm. or more high, white, 
smooth below, roughish pubescent above: ‘is branches alternate, 
the lower ones elongate; the lower leaves oblanceolate, sinuate 
dentate, 6-8 c . wide, ow base, 
the upper leaves smaller, coarsely dentate, sessile, all of them 
roughish with a barbed pubescence; the flowe llow, numerous in 
a cyme of alternate branches, the whole flower—capsule and petals 
—2 cm. long, py subtended by a narrow entire bract, five 
outer petals 13 mm. Jong, the claws short and broad, the upper 
portion ovate, point me the outside oe nve inner ra 
smaller, spatulate; the capsule 8-11 mm. long, rounded a 
oe 
pubescent like the capsule; the style mm. long, =o 
at the tip; seeds ey slightly over 2 mm. long, I.5 mm. wide, 
the margin very narrow. 
The only ae where I have collected this Nuitallia is 
De Beque, in Mesa County, on the hills north of the town. 
The type specimens (No. 5842) were collected August 22, 1918. 
The species begins to blossom near the first of June. It is peculiar 
in its narrowly margined seeds and pubescent petals. 
‘Acrolasia humilis sp. nov. 
An 1-1.5 dm. high, the stem white, smooth below, 
debian: with slender barbed hairs above, the first branches 
from near the base, but the branches few an d distant; the low- 
est ‘eee spatulate, on short petioles, 3-5 cm. long, 5 mm. or 
glabrous above or nearly so; the first flowers sessile in the axil 
of the branches, the later ones clustered and sessile at the ends 
of the branches, the petals five, yellow, broadly obovate, veined, 
2.5-3 mm. long, the calyx lobes linear, 2 mm. gad the stamens 
ten to fifteen, the Maras slender, the anthers ior the 
capsule becoming about I cm. long, 3 mm. wide, rough wit 
small barbed pubescence, ‘andl longer slender hairs not barbed; 
the seeds prismatic and minutely muricate 
The type specimens were collected at and Junction, on 
the north side, near the coal mines, May 30, 1921, No. 6086. 
I also collected it in the vicinity of Eckert, in Delta County. 
On account of the entire leaves it rather resembles Acrolasia 
183 
