STAXDLEY TREES AXD SHRUBS OF MEXICO 1'07 



83. BEBBIA Greene, Bull. Calif. Acad. 1: 179. 1885. 

 1. Bebbia juncea (Beuth.) Greene, Bull. Calif. Acad. 1: 180. 1885. 



Carphephorus junceus Benth. Bot. Voy. Sulph. 21. 1844. 



Baja California and islands; Sonora; type from Magdalena Bay, Baja California. 

 California to New Mexico. 



Shrubby, 2.5 meters high or less, intricately branched, glabrous except on the 

 invohicre and the apex of the peduncles, strong-scented; leaves opposite below, 

 alternate above, linear, about 3 cm. long or less, 2 mm. wide or less, entire or few- 

 toothed, fleshy; heads solitary or few and cymose at tips of the long, nearly naked 

 branches, discoid, yellow, 1 to 1.5 cm. wide; involucre strongly graduate, 5 to 

 8 mm. high, the outer phyllaries (2 or 3 series) oval, subherbaceous with scarious 

 margins, obtuse or rounded, rarely acute, canescent-pubescent, the inner (about 

 2 series) thinner, subscarious; proper tube of the corollas densely stipitate-glandu- 

 lar; achenes somewhat compressed; pappus 1-seriate, of 20 plumose bristle-like 

 awns more than twice as long as the achene. 

 la. Bebbia juncea aspera Greene, Bull. Calif. Acad. 1: 180. 1885. 



Bebbia aspera A. Nels. Bot. Gaz. 37: 273. 1904. 



Baja California and islands, Sinaloa, and Sonora. California, Nevada, and 

 Arizona; type from "southeastern borders of California, and adjacent Arizona." 



Similar; stem and leaves more or less densely hispidulous; phyllaries usually 

 acute or acuminate. 



lb. Bebbia juncea atriplicifolia (A. Gray) I. M. Johnston, Proc. Calif. 

 Acad. IV. 2: 1197. 1924. 



Carphephorus atriplicifolius A. Gray, Proc. Amer. Acad. 5: 159. 1861. 



Bebbia atriplicifolia Greene, Bull. Calif. Acad. 1: 181. 1885. 



Cape Region of Baja California; type from Cape San Lucas. 



Stem hispidulous or sometimes glabrous; leaves petioled, the blades triangular- 

 ovate, 2 to 5 cm. long, 0.6 to 4 cm. wide, hastately lobed or toothed; heads 

 several or numerous, cymose-panicled; pedicels usually stipitate-glandular as 

 well as hispidulous; involucre less pubescent, the phyllaries acute or acuminate. 



84. TRIDAX L. Sp. PL 900. 1753. 



Reference: Robinson & Greenman, Revision of the genus Tridax, Proc. 

 Amer. Acad. 32: 4-10. 1896. 



Herbaceous, rarely suflfruticulose; leaves chiefly opposite, entire to pinnatisect; 

 heads long-peduncled, radiate or rarely discoid; involucre 2 to several-seriate, 

 the phyllaries usually scarious-margined; rays white, rosy, or yellow, more or 

 less distinctly bilabiate, fertile; disk usually yellow; achenes turbinate, usually 

 villous; pappus of plumose squamellae or awns. 



Plant green; leaves lanceolate to ovate, toothed 1. T. procumbens. 



Plant densely lanate-tomentose; leaves narrowly linear, entire. 



2. T. candidissima. 

 1. Tridax procumbens L. Sp. PI. 900. 1753. 



Balbisia elongata Willd. Sp. PI. 3: 2214. 1804. 



Amellus pedunculatus Ort.; Willd. Sp. PI. 3: 2214. 1804, as synonym. 



Balbisia divaricata Cass. Ann. Sci. Nat. 23: 90. 1831. 



Throughout Mexico; type from Veracruz. West Indies; Guatemala to South 

 America; introduced in Florida, India, and Mauritius. 



Herbaceous or suffruticulose (?), procumbent, hirsute; leaves petioled, the 

 blades lanceolate to ovate, 1 to 8 cm. long, 0.5 to 3 cm. wide, repand-toothed to 

 sharply serrate, cuneate-based; involucre 2 or 3 seriate, the phyllaries oblong, 

 acutish; rays creamy-yellowish or "white," the disk yellow; pappus awns 4 mm. 

 long, about twice as long as the achene. "Cura-gusano" (Guatemala); "hicrba 

 del toro" (El Salvador). 



