Marshall—The Vegetation of Twin Island.- 
797 
’Aster ales 
Helianthus hirsutus Baf., Stiff-haired sunflower, c; b. s. 
Bidens cernua L., Smaller bur-marigold, s. 
Bidens comosa (A. Grav) Wiegand, Leafy-bracted tick- 
seed, b. s. 
Bidens frondosa L., Black beggars-ticks, b. s. 
Solidago canadensis L., Canada goldenrod, c. 
Solidago nemoralis Ait., Field goldenrod, b. s. 
Aster exiguus (Fernald.) Bydb., Ciliated-leaved aster, 
c; b. s. 
Aster puniceus L., Bed-stalked aster, b. s. 
Aster macropbyllus L., Large-leaved aster, c. 
Achillea millefolium L., Yarrow, c. 
Nabalus albus (L.) Hook., Battlesnake-root, c. 
Eupatorium purpureum L., doe-pye weed, b. s.; s. 
Erecbtites hieracifolia (L.) Baf., fire weed, b. s; s. 
Carduus lanceolatus L., Common bur thistle (?), b. s. 
Taraxacum taraxacum (L.) Barst., Dandelion, (?), b. s; s. 
Anapbalis margaritaceae (L.) Bentli. & Hook., Pearly ever¬ 
lasting, b. s. 
To Doctor Charles E. Bessey and Doctor Frederic E. 
Clements who have generously given help and suggestions in 
the preparation of this paper the author desires to express 
her thanks. 
The University of Nebraska, 
June, 1907. 
