A. VULGARIS. 85 



The form occurs south through the Cascade Mountains to Oregon, but apparently does not reach 

 California. 



A. incompta Nuttall. Plant robust,3 to 9 dm. high; leaves 4 to 8 cm. long, cleft into long or some- 

 times short but always comparatively broad lanceolate segments, these commonly 3 to 5 mm. wide; 

 inflorescence loose and open, decidedly paniculate. Scarcely distinguishable from genuine discolor, 

 except by the wider leaf-segments. Belongs to moderate altitudes, both in the Rocky Mountains 

 and in the Sierra Nevada. 



Other but still less important forms are indicated in the present list under A. graveolens, A. potens, 

 A. tenuis, and A. tenuis var. integerrima. 



54. A. MiCROCEPHALA WootoH, Bull. Torr. Club 25:455, 1898. — Because of the earlier A. microcephala 

 Hildebrand, this name was changed by Wooton to A. albula, which see. 



55. A. MUELLERi Rydberg, ?{. Am. Fl. 34:270, 1916. — A form of A. vulgaris mexicana with the upper leaves 

 inclined to be wider (5 to 15 mm. wide) and usually entire. The type specimen has only upper leaves, but 

 others of the same form in the Columbia University Herbarium have leaves well below the inflorescence and 

 none of these are cut. However, Pringle's 9848, from Hidalgo, as represented at New York, is almost identical 

 with the type of muelleri, except that lower leaves are present, and these are cut nearly to the base into 3 long 

 linear-attenuate lobes, as in typical mexicana. Evidently here as elsewhere in the species the use of leaf- 

 lobing as a criterion would result in much confusion. The leaves of muelleri are strongly veined beneath. 

 Type locality, Orizaba. 



56. A. NATRONENSI8 Nelson, Bull. Torr. Club 26:485, 1899.— A. vulgaris longifolia. Type locality, Willow 

 Creek, Wyoming. 



57. A. NEOMEXicANA Greene; Rydberg, N. Am. Fl. 34:279, 1916. — A narrow-leaved form of A. vulgaris 

 mexicana, therefore intermediate to subspecies urighti. The leaves, which are green and glabrate above, 

 are up to 4 mm. wide below the divisions and the lobes themselves are 1 to 2 mm. wide. The inflorescence 

 is more condensed than usual in mexicana, the main portion only about 2 cm. broad, but in one of the types 

 the basal portion is more branched and 4 cm. broad. Type locality, Hillsboro Peak, Black Range, New Mexico. 



58. A. OBTUSA Rydberg, 1. c, 274, 1916. — A leaf-form of A. vulgaris gnaphalodes, in which the lower leaves 

 are pinnately parted into 3 to 7 divisions. Although these divisions are described as oblong and obtuse, they 

 of course narrow more or less towards the summit and are mostly mucronate, so that they approach too closely 

 the shape of the divisions in other forms of gnaphalodes, especially A. diversifolia. Type locality, Columbia 

 River, Washington. 



59. A. PABULARis Rydberg, Bull. Torr. Club 33:157, 1906. — Based upon A. rhizomata variety pabularis, 

 which see. 



60. A. PAUCICEPHALA Nelson, Bull. Torr. Club 27 :35, 1900.— A variation of A. vulgaris intermediate between 

 the subspecies candicans and ludoviciana. The large heads with involucres 4 mm. high and the 3 mm. long 

 disk-corollas seem to ally it more closely with the former, but the tomentum is as sparse as in the latter. Said 

 to be distinguished by its tufted cespitose habit and its low erect stems. Nelson found 40 to 60 flowers in a 

 head; recent counts of 2 heads of type material indicated totals of 23 and 27 flowers respectively. Type locality, 

 near Yellowstone Lake, on the banks of a tributary creek. 



61. A. PLATYPHYLLA Rydberg, N. Am. Fl. 34:275, 1916. — A foliage variation of A. vulgaris candicans, 

 the lower and middle leaves cuneate-obovate and with a few short wide lobes or teeth above the middle. 

 Very striking in its extreme development, but thoroughly intergrading with typical candicans at the type 

 locality, namely, Spokane, Washington, and in the surrounding country, as evidenced by an extensive series 

 of specimens collected by Miss Evelyn Moore (Herb. Univ. Calif.). 



62. A. POTENS Nelson, Bot. Gaz. 54:418, 1912. — A. vulgaris discolor. This is very close to the original 

 discolor form and is not at all of the michauxiana type, so often taken as typical discolor (see under 

 michauxiana of this list). The lower leaves are mostly wanting from specimens of the type collection, but 

 a few withered ones have lobes again toothed and in earlier leaves the foliage is probably twice-cut. 

 According to Nelson, potens is herbaceous to the ground and grows on dry saline-gravelly clays of the 

 plains. Type locality, Mackay, Idaho. 



63. A. PREscoTTiANA Besscr; Hooker, Fl. Bor. Am. 1:324, 1833. — Apparently known only from plants 

 collected by Douglas in northwest America. At the herbarium of the New York Botanical Garden is a drawing 

 and fragment from a plant at Kew collected by Douglas near the Grand Rapids of the Columbia in 1825. 

 These are said to correspond exactly with the type in the Lindley Herbarium. From this material and the 

 description it seems that prescottiana is very close to A. vulgaris virighti, but differs in the strictly racemose 

 arrangement of the heads. This character suggests subspecies lindleyana, but the foliage is very different, 

 the leaves and their lobes being almost filiform and revolute. The involucre is 3.5 mm. high and nearly 

 5 mm. broad. Further collections are needed before the exact placing of this form can be made. 



64. A. PRiNGLEi Greenman, Proc. Am. Acad. 40:50, 1904. — A Mexican variation of A. vulgaris wrighti. 

 The large heads are arranged in a racemiform panicle, the number of heads reduced, and the number of flowers 

 in each head increased. In the type specimen the involucres are 3 mm. high and broad, this being about 



