114 TWELFTH ANNUAL REPORT. 



A. cauiiabiuum, L. Indian Hemp. 



Also common throughout the stale. (Polymorphous; the var. glaberrimum, DC, 

 has been noted Iq Faribault county, Upham; and var. hypericlfolium, Gray, at lake 

 Minnetonka, Roherts, St. Louis river, Mrs. Herrick, and Pembina, Havard: var. pubes- 

 cens, DC, probably also occurs here ; but intermediate forms are found, "rendering 

 useless any sub-specific names." 



ASCLEPIADACE^. Milkweed Family. 



ASCLEPIAS, L. Milkweed. Silkweed. 



A. speciosa, Torr.* Milkweed. Silkweed. 



Red river valley, in Clay county (frequent on portions of the prairie which are inter- 

 mediate between wet and dry), Upham; Big Stone county, Campbell, determined by 

 Prof. Asa Gray; extending east to the central part of Minnesota, Rev. E. L. Greene, 

 and Martin county, Gedge, Leiberg. [Frequent in Emmet county, Iowa (sometimes 

 troublesome in grain-fields, like A. Cornuti elsewhere), Cratty.] West. 



A. Cornuti, Decaisne. Common Milkweed or Silkweed. 

 Common throughout the state, excepting perhaps northeastward. 



A. Siillivautii, Engelm. SuUivant's Milkweed. 



Common, or frequent, across the south part of the state ; extending north to Blue 

 Earth county, Gcdge, Brown county, Juni, wet prairies of central Minnesota, Rev. E. L. 

 Greene, and in the Red river valley at least to Clay county (frequent), Gedge. 



A. phytolaccoides, Pursh. Poke-Milkweed. 



St. Croix river, Parry; lake Pepin, Miss Manning; Minneapolis, Herrick, Hatch; 

 Stearns county, Up/iam; Detroit, Becker county, Gedge. Infrequent. South. 



A. purpurascens, L. Purple Milkweed. 



Lake Pepin, Mi^s Manning; Stillwater, Miss Field; Hennepin county, Herrick, 

 JTafc/t; upper Mississippi river, Garrison. Infrequent. South. 



A. ovalifolia, Decaisne. Milkweed. 



Frequent throughout the prairie region of the state : common in Benton, Stearns 

 and Todd counties (in oak openings and prairies), Upham; the most common species of 

 this genus in the Red river valley, Gedge. 



A. quadi'ifolia, L. Four-leaved Milkweed. 



Shores of lake Pepin, both in Minnesota and Wisconsin, Miss Manning. Rare. 

 Souih. 



A. incarnata, L. Swamp Milkweed. 

 Common throughout the state. 



A. incarnata, L., var. piilclira, Pers. Swamp Milkweed. 

 Minneapolis, Kassube. 



*AscLEPiAS SPECIOSA, Torr. Finely canescent-tomeutose, rarely glabrate with 

 age : leaves from subcordate-oval to oblong, thickish : peduncles shorter than the 

 leaves : pedicels of the many-flowered dense umbel and the calyx densely tomentose : 

 flowers purplish, large : corolla-lobes ovate-oblong, 4 or 5 lines long : hoods 5 or 6 lines 

 long, spreading, the dilated body and its short inflexed horn not surpassing the anthers, 

 but the center of its truncate summit abruptly produced into a lanceolate-ligulate 

 thrice longer termination : column hardly any : wings of the anthers notched and 

 obscurely corniculate at base,— Follicles echinate with soft spinous processes and 

 densely tomentose, large (3 to 5 inches long) and ventricose, ovate and acuminate, 

 anect on deflexed pedicels : leaves large and broad, short-petioled, transversely 

 veined : stems stout and simple, 2 to 5 feet high. Gray's Synoptical Flora of N. A. 



