150 Rydberg : Studies on the 



South Dakota : Sylvan Lake, Black Hills, 1892, P. A. Ryd- 

 berg, soy (type in herb. Columbia University). 



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 margins nearlyhorizontal : lateral sepals broadly rounded- 

 ovate, somewhat oblique, 12-15 mm. long : lower sepals 9-12 mm. 

 long, oblong, obtuse. 



This species is perhaps closest related to A. rainosum A. Nel- 

 son, but the divisions of the leaves are broader and the hoods are 

 different, having a porrect beak, while in A. ramosiivi 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. 



Colorado: Boreas, 1897, C. S. Craiuiall (ty^e in herb. N. Y. 

 Bot. Garden ; cotypes in herb. State Agric. College, Colo.) ; 

 mountains about Steamboat Springs, 1891, C. S. Crandall ; near 

 Ironton, 1899, C. C. Curtis ; Cameron Pass, 1896, C. F. Baker. 



Utah: Uinta Mountains, 1873, T. C. Porter. 



Aconitum porrectum 



Perennial with thick fusiform roots : stem stout, 6-7 dm. high, 

 leafy, glabrous below, densely viscid-pubescent above ; basal leaves 

 glabrous, with petioles about i 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 dark 

 blue, ciliate on the margins ; hood very saccate, helmet-shaped ; 

 beak acuminate, porrect, horizontal or even slightly ascending, 

 15-18 mm. long ; lateral sepals broadly obovate or semi-reniform, 



