STANDLEY TREES AND SHRUBS OF MEXICO 1489 



Heads in close cymose clusters at tips of stem and branches. 

 Phyllaries with acute or acuminate spreading herbaceous tips. 



19. A. tridentatus. 

 Phyllaries with appressed tips. 



Leaf rachis narrowly linear, of the same breadth as the lobes. 

 Leaves with one or two short lobes or teeth above. 



14. A. drummondii. 



Leaves regularly pinnatifid 18. A. fruticosus. 



Leaf rachis much broader than the breadth of the lobes or 

 teeth. 

 Leaves chiefly cuneate or cuneate-oblanceolate, with few 



short teeth 16, A. venetus. 



Leaves chiefly linear-spatulate or spatulate-oblanceolate, 

 incise-toothed or pinnatifid 17. A. hartwegi. 



1. Aplopappus linearifolius DC. Prodr. 5: 347. 1836. 

 Stenotus linearifolius Torr. & Gray, Fl. N. Amer. 2: 238. 1842. 

 Stenotopsis linearifolia Rydb. Bull. Torrey Club 27: 617. 1900. 



Zapato Chino, Baja California {Brandegee, according to Hall). California. 



Shrub 1.5 meters high or less, somewhat resinous; leaves crowded, linear, 

 acute, punctate; peduncles short, nearly naked; inner phyllaries with scarious 

 margins; achenes silky-pubescent; pappus soft, 



la. Aplopappus linearifolius interior (Coville) Jones, Proc. Calif. Acad. II. 

 5: 697. 1895. 



Aplopappus interior Coville, Proc. Biol. Soc. Washington 7: 65. 1892. 



San Pedro Mdrtir, Baja California (Brandegee, according to Hall). California 

 to Utah and Arizona; type from Inyo County, California. 



Similar, but with shorter leaves, rays, and involucre. 



2. Aplopappus oppositifolius (A. Gray) Blake. 



Bigelovia oppositifolia A. Gray, Proc. Amer. Acad. 15: 32. 1879. 



Known only from the type localitj', San Luis Potosi. 



Low shrub, resinous and obscurely puberulous; leaves opposite; petioles 3 to 

 5 mm. long; blades ovate-elliptic or rhombic-elliptic, 1.5 cm. long, 7 mm. wide, 

 acutish, cuneate at base, thick, about 7-toothed above the middle, dotted; 

 heads solitary at tips of branches, subsessile, discoid, 1 cm. high; involucre 

 2-seriate, sometimes with one or two small outer bracts, subequal, 8 mm. high, 

 the phyllaries oblong, acute, striate, glandular-granular, ciliolate above, without 

 herbaceous tips; flowers 20 to 25; achenes puberulous. 



3. Aplopappus cuneatus spathulatus (A. Gray) Blake. 

 Bigelovia spathidata A. Gray, Proc. Amer. Acad. 11: 74. 1876. 

 Ericameria cuneata spathulata H. M. Hall, Univ. Calif. Publ. Bot. 3: 352. 



1907. 



Northern Baja California; type from Cantillas Canyon. California and 

 Arizona. 



Spreading shrub, about 30 cm. high, glabrous, densely glandular-punctate; 

 leaves cuneate or obovate, 1 to 2 cm. long, 3 to 10 mm. wide, thick, entire, 

 usually retuse; heads several in terminal cymose panicles, discoid, turbinate; 

 involucre 6 to 8 mm. high, graduate, of acutish, lanceolate or linear-lanceolate 

 phyllaries without herbaceous tips; achenes silky-pubescent; pappus brownish. 



4. Aplopappus palmeri A. Gray, Proc. Amer. Acad. 11: 74. 1876. 

 Chrysoma palmeri Greene, Erythea 3: 12. 1895. 



Ericameria palmeri H. M. Hall, Univ. Cahf. Publ. Bot. 3: 53. 1907. 

 Northern Baja California; type from Tecate Mountains. California. 



