150 RYDBERG: STUDIES ON THE 
Sourn Dakota: Sylvan Lake, Black Hills, 1892, P. A. Ryd- 
berg, 507 (type in herb. Columbia University). 
Y Aconitum atrocyaneum 
Perennial with thickened-fusiform roots: stem stout, 4-6 dm. 
high, leafy, glabrous below, densely glandular viscid and purplish 
above: lower leaves with petioles 5—10 cm. long; blades about 
6 cm. wide, glabrous, pentagonal in outline, 5—7-divided to near 
the base ; divisions rhombic-cuneate to oblanceolate, usually twice 
cleft ; ultimate segments lanceolate acute ; upper stem-leaves sim- 
ilar but with short petioles or those of the inflorescence lanceolate, 
toothed and often with recurved basal lobes: inflorescence race- - 
mose, many-flowered, leafy: pedicels 1~3 cm. long, erect, very 
viscid: flowers dark indigo blue, more or less pubescent: hood 
deeply saccate, helmet-shaped, about 18 mm. long, with the front — 
line more or less concave : beak somewhat porrect, acuminate, the 
lower mar gins nearlyhorizontal : lateral sepals broadly rounded- 
ovate, somewhat oblique, 12-15 mm. long : lower sepals g-12 mm. 
long, oblong, obtuse. 
This species is perhaps closest related to A. ramosum A. Nel- 
son, but the divisions of the leaves are broader and the hoods are 
different, having a porrect beak, while in A. ramosum the beak is 
short and directed downward. The flowers are also darker and 
the inflorescence more viscid. It grows at an attitude of 2,500 
—3,400 m. 
CoLtorapo: Boreas, 1897, C. S. Crandall (type in herb. N. Y. 
Bot. Garden; cotypes in herb. State Agric. College, Colo.); 
mountains about Steamboat Springs, 1891, C. S. Crandall; neat 
Ironton, 1899, C. C. Curtis ; Cameron Pass, 1896, C. F. Baker. 
Utau: Uinta Mountains, 1873, 7. C. Porter. 
v Aconitum porrectum 
Perennial with thick fusiform roots : stem stout, 6—7 dm. high, 
leafy, glabrous below, densely viscid-pubescent above ; basal cave 
glabrous, with petioles about 1 dm. long; blades reniform-pen 
tagonal in outline, 6-10 cm. wide, 5—7-divided to near the base; 
divisions rhombic or rhombic-oblanceolate, variously cleft above, 
cuneate at the base: inflorescence racemose or somewhat panicu= 
late, not leafy; pedicels ascending, 1-3 cm. long: sepals dar 
blue, ciliate on the margins; hood very saccate, helmet-shaped 5 
beak acuminate, porrect, horizontal or even slightly penne 
15-18 mm. long ; lateral sepals broadly obovate or semi-renilo 
