82 GENUS AKTEMISIA. 



that when Gray proposed his A. wrighti he did not intend to establish a species distinct from .4. carruihi, the 

 earlier publication of which he apparently overlooked. The type of A. carruihi came from Kansas. 



9. A. coLORADENSis Ostcrhout, Bull. Torr. Club 27:. 506, 1900.— .4. vulgaris wrighti. The leaf-segments 

 are unusually wide and revolute-margined. If flattened out they would be about 3 mm. wide, thus much 

 resembling tho.se of some forms of subspecies Ittdoviciana, although more densely gray-toraentose on the upper 

 surface. Grows in dry, rocky places, which suggests that it may be only a xerophytic ecad of the cut-leaved 

 form of ludoviciana or of gnaphalodes. Type locaUty, near Dale Creek, Larimer County, Colorado. 



10. A. CUNE.\T.\ Rydberg, N. Am. Fl. 34:269, 1916. — A striking foliage-form of A. vulgaris ludoviciana. 

 The principal leaves are cuneate-obovate, 2 to 4 cm. long, about 1 cm. wide, and with a few salient teeth around 

 the wide summit. Type locality, Idaho Springs, Colorado. Rare, but known from as far west as Fishhook 

 Ferry, Franklin County, Oregon, Leiberg 937 (Gr). 



11. A. CUNEIFOLIA Scheele, Linnaea, 22:162, 1S49.— Not A. cuneifolia De CandoUe, 1837. The types not 

 seen. Apparently a tall, very erect, and rigid small-headed form of A. vulgaris mexicana. Type locality, 

 high places on the prairie near New Braunfels, Texas. 



12. A. DISCOLOR Douglas, in Hooker, Fl. Bor. Am. 1:322, as synonym, 1833; Besser, Bull. Soc. Nat. Mosc. 

 9:46, 1836.— A. vulgaris discolor. 



13. A. DISCOLOR iNCOMPTA Gray, Syn. Fl. P:373, 1884. — Based upon A. incompta Nuttall, here considered 

 as a trivial form of A. vulgaris discolor. (See incompta of this list.) 



14. A. DivBRSiFOLiA Rydberg, Bull. Torr. Club 28:20, 1901. — When restricted to the form originally 

 described, this is the same as .4. vulgaris gnaphalodes, except that the lower leaves are pinnately cleft into 3 to 5 

 narrowly lanceolate acuminate lobes which are directed forward. While probably of gnaphalodes origin, 

 it may be compared with ludoviciana, of which it is possibly an expression with both faces of the leaves about 

 equally tomentose. In the North American Flora (34:275, 1916) Rydberg extends the description to include 

 anything in the way of leaves from pinnately cleft to "the upper or rarely aU entire." Thus ".4. diversifolia" 

 becomes a convenient receptacle for a considerable number of leaf-forms, all of which are here assigned to sub- 

 species gnaphalodes. Some of these come very close to the minor variation called A. brittoni Rydberg. If 

 one is to use the cut of leaf as a specific character, as is sometimes done for segregates of both gnaphalodes and 

 ludoviciana, consistency would demand that it be applied also in connection with these forms conveniently 

 assembled under diversifolia. This, however, is an extreme to which no one, apparently, is willing to go. 

 Variations in cut of leaf on plants from the same area are shown in the figures on page 95. Type locality, 

 Priest River, Idaho. 



15. A. DOMiNGENSis Urban, Symb. Ant. 7:430, 1912. — A form of A. vulgaris perhaps nearest to typica. 

 The type specimen has not been seen, but Doctor Urban has kindly sent a fragment from the Herbarium of 

 Krug and Urban (No. 153d) which he considers to be the same. This was collected in the mountains of Haiti, 

 November, 1896. The leaves are small and apparently without stipule-lLke lobes at base, but otherwise as 

 in typica, as far as the scant material indicates. The involucre is 2 mm. high, 2.6 mm. broad, and of about 

 15 bracts. The only head dissected had 28 ray-flowers and 15 disk-flowers. The large number of the former 

 is remarkable. The type locality is near Constanza, Santo Domingo. 



16. A. DOUGLASIANA Bes.ser,in Hooker, Fl. Bor. Am. 1:323, 1833. — A. vulgaris heterophylla. The form 

 with nearly entire leaves. Type locality, Northwest America. (See discussion under A. hookeriana of this list.) 



17. A. ELATiOR Rydberg, Mem. N. Y Bot. Gard. 1:430, 1900. — Based upon A. tilesi elalior. (See under 

 this name in the present list.) 



18. A. FALCATA Rydberg, N. Am. Fl. 34:271, 1916. — In every respect the same as A. vtdgaris longifolia, 

 except that many of the very narrow, elongated leaves have salient spreading lobes. An almost exact match 

 for the type except for this lobing is found in undoubted longifolia specimens, for example. Boiler Rapid, 

 Athabasca River, Preble and Cary 131 (US). The foliage resembles that of mexicana, but the large heads 

 serve to distinguish it and the distribution is very different. Apparently confined to gumbo soils and known 

 only from South Dakota to Saskatchewan within the general area occupied by longifolia. Type locality. 

 Fort Pierre, South Dakota. 



19. A. FLOccosA Rydberg, Bull. Torr. Club 24:297, 1897.-4. vulgaris candicans. Separated on the basis 

 of the inflorescence, the heads all erect and on peduncles 1 to 12 mm. long instead of sessile in glomerules; 

 also on having the leaves equally tomentose on both sides. In considering a series of collections, like those 

 at the New York Botanical Garden, some will fall plainly into one or the other if the inflorescence alone is 

 considered, but some specimens have both sessile and peduncled heads and the length of the peduncle varies 

 to such an extent that no two people would separate all of the material in the same way. The density of the 

 tomentum also shows much intergradation and does not vary parallel with the inflorescence characters. Even 

 in the type of candicans the difference between the upper and lower surfaces of some leaves is not noticeable. 

 At the type locality of floccosa, namely Lima, Montana, some plants have the small heads of gnaphalodes, the 

 involucres only 2.5 cm. high, while others have involucres 4 mm. high, as in candicans. These extremes were 

 collected under Hall 11570, and other forms and intermediates under Hall 11363 and 11567, all from near Lima. 



