44 UNIVERSITY OF COLORADO STUDIES 
Colorado—ovate or nearly orbicular, 4-7 cm. long, 3-6 cm. wide, sharply serrate, or above 
doubly serrate or 3-7 lobed, bright green, glabrous. 
Erythropoda—bright green, glabrous, 3-7 cm. long, 2-5 cm. broad, ovate or obovate in 
outline, obtuse or acute at apex, obtuse or acute at the base, which is decurrent on the 
petiole; rather obtusely serrate, sometimes with 3-7 shallow lobes. 
Cerronis—broadly elliptic-ovate, 3-5 cm. long, 2-3 cm. broad, coarsely and serrately jew- 
toothed, the teeth with finer gland-tipped acute serrations, acute or acuminate at apex, 
the abruptly cuneate base entire or remotely serrulate, light green and perfectly 
glabrous below, sparsely ciliate-pubescent above, especially on the veins. 
Coloradensis—4-5 cm. long, mostly broadly oval to orbicular in outline, sometimes a 
little narrower, or the upper half broadly triangular-acute; the base rounded or some- 
what cuneate, entire or minutely serrate; the upper halj incisely and coarsely toothed, 
with finer serrations on the teeth, which are slightly calloused but not glandular; 
scatteringly ciliate-pubescent above, nearly glabrous beneath except on the 
midrib and primary veins which are noticeably ciliate-pubescent or hirsute, even at 
maturity; nearly full size when the flowers open. 
PETIOLES 
Occidentalis—slender. 
Chrysocarpa—at first pubescent, at length nearly glabrous, slender, 1-2 cm. long, nar- 
rowly winged, roughened with a few dark brown glands. 
Colorado—1—1} cm. long, grooved on the upper surfaces, villous. 
Erythropoda—half to 14 cm. long, winged above, generally purplish. 
Cerronis—slender, without glands, channeled above, 5—20 mm. long. 
Coloradensis—moderately stout, short, rarely more than } or 3 as long as the blade. 
INFLORESCENCE 
Occidentalis—corymbs several-flowered. 
Chrysocarpa—corymbs compound, the branches more or less villous. 
Colorado—corymbs many, 10-20 flowered, compound, villous, as well as the conical calyx. 
Erythropoda—glabrous, compound, 3—7 cm. wide. 
Cerronis—the paniculate corymb 5-10 flowered, congested in blossom but more open in 
fruit. 
Coloradensis—corymb many-flowered (10-12), broad or flat-topped, the pedicels hirsute- 
pubescent, rather slender, 1-3 cm. long. 
FLOWERS 
Occidentalis—about 14 cm. wide. 
Chrysocarpa—(no mention). 
Colorado—about 1.8 cm. wide. 
Erythropoda—(no mention). 
Cerronis—petals suborbicular, with shallow crenations, noticeably reticulate-veined, 
6-8 mm. broad. 
Coloradensis—petals orbicular, about 8 mm. diameter, crenately toothed. 
CALYx 
Occidentalis—(no mention). 
Chrysocarpa—(no mention). 
