STANDLEY TREES AND SHRUBS OF MEXICO 1493 



Similar to the last species, and doubtfully distinct from it; leaves narrowly 

 oblanceolate or spatulate-oblanceolate, deeply laciniate-toothed or iobed, the 

 lobes lanceolate or oblong-linear, 2 to 5 pairs, 1.5 to 4 mm. long. 



18. Aplopappus fruticosus (Rose & Standi.) Blake. 



Linosijris coronopifolia A. Gray, PI. Wright. 1: 96. 1852. Not Aplopappus 

 coronopifolius DC. 1836. 



Bigelovia coronopifolia A. Gray, Proc. Amer. Acad. 8: 638. 1873. 



Isocoma coronopifolia Greene, Erythea 2: 111. 1894. 



Isocoma fruticosa Rose & Standi. Contr. U. S. Nat. Herb. 16: 18. pi. IS. 1912 



Sonora. Arizona and Texas; type collected along the Rio Grande, Texas. 



Suffrutescent or fruticose, 60 cm. high or less, resinous, hirtellous to glabrous; 

 leaves linear to oblong-ovate in outline, 1.2 to 4 cm. long, 0.3 to 3 cm. wide, 

 pinnately divided, the lobes 2 to 6 pairs, linear or linear-filiform, of the same 

 breadth as the leaf rachis; heads discoid, about 12-fiowered, crowded in terminal 

 usually panicled cymes; involucre 4 to 5 mm. high, the phyllaries with distinct 

 or indistinct, obtuse, greenish tips; achenes silky. 



19. Aplopappus tridentatus (Greene) Blake. 

 ILinosyris dentata Kellogg, Proc. Calif. Acad. 2: 16. 1863. 

 Bigelovia tridentata Greene, Bull. Torrey Club 10: 126. 1883. 

 Isocoma tridentata Greene, Erythea 2: 111. 1894. 



Cedros Island and Rosalia Bay, Baja California; type from Cedros Island. 



SufFruticose, branched, 30 cm. high or more, resinous, essentially glabrous; 

 leaves cuneate to linear-spatulate, 1.5 to 2.8 cm. long, 3 to 17 mm. wide, triden- 

 ticulate (rarely entire) to pinnatifid, the lobes 1 or 2 pairs, spinulose-tipped, 

 triangular or oblong-lanceolate, shorter than or exceeding the breadth of the 

 leaf rachis; heads discoid, about 19-fiowered, pedicellate, cymose at tips of stem 

 and branches; involucre 7 to 9 mm. high, the phyllaries lanceolate to linear- 

 lanceolate, with conspicuous, acute or acuminate, mostly spreading, greenish 

 tips; achenes silky. 



20. Aplopappus fasciculatus Vasey & Rose, Proc. U. S. Nat. Mus. 11: 

 530. 1889. 



Known only from the vicinity of the type locality, San Quintin, Baja California. 



Suflfrutescent, 30 cm. high and more, apparently branched only at apex, 

 glutinous, essentially glabrous, very leafy; leaves narrowly linear-spatulate, 

 about 2.5 cm. long, 2 to 3 mm. wide, entire, acute, bearing fascicles in their 

 axils; heads numerous, discoid, 15 to 25-flowered, mostly pediceled, in panicled 

 cymes; involucre 6.5 to 9 mm. high, the phyllaries oblong or ovate-oblong, acute, 

 greenish-tipped, appressed or rarely slightly spreading at apex. 



21. Aplopappus canus (A. Gray) Blake, Contr. U. S. Nat. Herb. 24: 86. 1922 

 Diplostephium canum A. Gray, Proc. Amer. Acad. 11: 75. 1876. 

 Corethrogyne detonsa Greene, Bull. Torrey Club 10: 41. 1883. 

 Corethrogyne cana Greene, Bull. Calif. Acad. 1: 223. 1885. 



Hazardia cana Greene, Pittonia 1 : 29. 1887. 



Hazardia detonsa Greene, Pittonia 1: 29. 1887, 



Hazardia serrata Greene, Pittonia 1: 30. 1887. 



Guadalupe Island, Baja California (type locality). Santa Barbara Islands, 

 California. 



Shrub about 1.3 meters high, densely tomentose, the foliage sometimes glabrate 

 on one or both sides; leaves obovate to oblanceolate or elliptic-obovate, 3 to 

 10 cm. long, 1 to 3 cm. wide, entire to sharply serrate, the larger often petiolate; 

 heads numerous, panicled, sessile or pedicellate; involucre 1 to 1.5 cm. high, 

 many-seriate, strongly graduate, more or less lanate-tomentose, the phyllaries 

 linear-lanceolate or linear, with thick, greenish, usually appressed, acutish tips; 



