STANDLEY TREES AND SHRUBS OF MEXICO 1617 



103. ARTEMISIA L. Sp. PL 845. 1753. 



Refkrence: Rydberg, N. Amer. Fl. 34: 244-285. 1916. 



Herbs or shrubs, usually bitter-aromatic; leaves alternate; heads small, panicled 

 (in ours), nodding, discoid or disciform, the marginal flowers sometimes pistillate; 

 involucre of few-seriate, more or less scarious-margined phyllaries; receptacle 

 glabrous or pubescent; achenes small, thickish; pappus wanting or rarely a low 

 squamellaceous crown. 



Leaves narrowly cuneate, 3-toothed at apex 1. A. tridentata. 



Leaves entire and filiform, or pinnately parted into filiform lobes. 



Heads minute, 1 to 1.5 mm. wide; involucre densely canescent-tomentose. 



2. A. filifolia. 



Heads larger, 3 to 4 mm. wide; involucre not canescent-tomentose. 



3. A. californica. 



1. Artemisia tridentata Nutt. Trans. Amer. Phil. Soc. n. ser. 7: 398. 1841. 

 Baja California. Western United States; type from the Columbia River. 

 Shrub up to 5 meters high, densely silky-pubescent, very leafy; leaves sessile, 



1 to 3 cm. long, 2 to 5 mm. wide; heads 3 to 4 mm. high, in dense leafy panicles; 

 pappus none. 



In some parts of the United States this species is abundant, and is known as 

 sagebrush. It has a bitter flavor and a characteristic odor. The Coahuilla 

 Indians of Cahfornia ground the seeds into a meal which was made into pinole. 

 The plant is used for various purposes in domestic medicine. 



2. Artemisia filifolia Torr. Ann. Lye. N. Y. 2: 211. 1828. 



Chihuahua. Nebraska and Wyoming to Texas and Nevada; type locality not 

 stated. 



Shrub up to 1 meter high, very leafy, cinereous-puberulous; leaves filiform or 

 3-parted into fihform lobes, 1.5 to 8 cm. long, about 0.2 mm. wide; heads yellow, 

 in long dense leafy panicles; pappus none. "Estafiate," "istafiate." 



A decoction of the leaves is employed in domestic medicine as a remedy for 

 intestinal worms and aff"ections of the stomach. 



3. Artemisia californica Less. Linnaea 6: 523. 183L 



Artemisia fischeriana Besser, Nouv. Mem. Soc. Nat. Moscou 3: 21. 1834. 



Artemisia abrotanoides Nutt. Trans. Amer. Phil. Soc. n. ser. 7: 399. 1841. 



Crossostephium californicum Rydb. N. Amer. Fl. 34: 243. 1916. 



Northern Baja California and Guadalupe Island (according to Brandegee and 

 H. M. Hall). California; type from California. 



Shrub 1 to 3 meters high, canescent-strigillose, sometimes greenish; leaves 

 about 4.5 cm. long, pinnately divided into few filiform lobes, or the upper entire; 

 heads in long narrow leafy panicles; pappus a minute squamellate crown. 



104. LIABUM Adans. Fam. PL 2: 131. 1763. 



Reference: Greenman, Key to the Mexican species of Liabum, Proc. Amer. 

 Acad. 32: 293-294. 1897. 



Shrubs or herbs; leaves opposite, rarely ternate, usually ovate, petioled, and 

 canescent-tomentose beneath; heads radiate or discoid, yellow, usually small 

 and panicled; involucre graduate, usually about 4-seriate; receptacle sometimes 

 bristly; achenes short, subterete; pappus usually of an inner series of slender 

 bristles and a short outer series of squamellae, or the latter wanting. 



Heads discoid. 

 Phyllaries obtuse. 



Leaves green and glabrous beneath 1- !•• glabrum. 



Leaves white-tomentose beneath la. L. glabrum hypoleucum. 



