218 University of California Publications in Botany. [VOL. 3 

 175 (1905). Not A. heterophylla Besser (1834). CALIFORNIA 



MUGWORT. 



Stems erect, woody at base, strict, 6 to 16 dm. high : leaves 4 

 to 10 cm. long, lanceolate to broadly oblong or elliptic, sparingly 

 pinnatifid (with downward incisions), cleft, or often entire 

 (especially the upper), green above, white-tomentose beneath: 

 heads mostly erect, the spikes in an open or more commonly 

 dense terminal panicle, the main axis leafy below and bracteate 

 above : involucre ovoid, 12 to 25-flowered, 3 or 4 mm. high, perma- 

 nently arachnoid. 



Common on wet ground toward the coast, less plentiful in the 

 mountains up to 1500 m. alt. (Upper Sonoran Zone), from Orange 

 Co. to Washington and the Rocky Mts. : San Jacinto Mt., Hall, 

 no. 2633 ; Verdugo Canon, near Los Angeles, Chandler, no. 2051 ; 

 etc. 



From Nuttall's A. heterophylla have been segregated two 

 distinct species : A. Suksdorfii Piper, 56 and A. Kennedyi A. Nel- 

 son. Although I have not seen the type of A. heterophylla Nutt., 

 I judge it to be identical with A. Kennedyi, since Nutt all had 

 only specimens from the Rocky Mountains. A. heterophylla 

 Besser being an unsustained species, our plant takes the name 

 A. heterophylla Nutt., in accordance with Art. 50 of the Vienna 

 rules. 



It has been assumed that this is not a seacoast species, but 

 besides occurring on the seacoast of Southern California, as noted 

 above, it is plentiful along the seaboard of middle California, 

 whence came three specimens cited by Professor Nelson, viz., 

 Heller, no. 7195, from Pacific Grove, which is as near the Pacific 

 as it could well be, Michener & Bioletti's plant from Temescal 

 Lake, which is within 4 kilometers of San Francisco Bay, and 

 Heller, no. 7209, from Los Gatos, also near the coast. However. 

 A. Suksdorfii and A. heterophylla (A. Kennedyi) do belong to 

 distinct geographic areas; the former to a narrow, humid coast 

 belt from British Columbia to Humboldt Co., California, the 

 latter to the interior districts from Washington to Southern Cali- 

 fornia and the seaboard from San Francisco Bay south. This 

 distribution is not surprising when we consider that numerous 



56 Bull. Torr. Club xxviii. 42 (1901). 



