( 164 ) 
gle 6085, and Conzatt2 & Gonzdlez rrrz, as well as several other 
older specimens. The carinate midnerve of the involucral scales is 
perhaps the most constant character separating it from the next. 
Their tips are pubescent rather than tomentose and tend to become 
glabrous with age. 
4. Leiboldia serrata (Don) nom. nov. 
Diazeuxis serrata Don, Trans. Linn. Soc. 16: 254. 1830. 
Vernonia arctiotdes Lessing, Linnaea 6: 400. 1831. 
Leiboldia arctioides Sch.-Bip. Linnaea 19: 7. 
In foliage and general habit resembling Z. Desndima but 
distinguished by the involucral scales, which are not carinately 
nerved, but rather striate, and more tomentose at the tip, and the 
achenes, which are tipped with a yellowish callus-ring about 0.5 
mm. wide. 
Type locality and distribution: Mexico. Orizaba, Midler ae 
055, I¢go (one specimen); Chiconquiaco, Schzede 1278. Th 
latter is one of the originals of Lessing’s Vernonia arcttotdes.. 
7 VERNONIA Schreb. Gen. Pl. 2: 541. 1791 
Suprago Gaertn. Fruct. 2: 402. 1791. 
Baccharotdes Moench, vies 578. 1794. 
Ascaricida Cass. Dict. Sci. Nat. 3: Suppl. 38. 1816. 
Lepidaploa Cass. Bull. Soc. Philom. 1817: 66. 1817; and Dict. 
Sci. Nat. 26: 16. 1823. 
? Achyrocoma Cass. Dict. Sci. Nat. 26: 21. 1823. 
Heads homogamous, 8—many-flowered; involucre narrowly cam- 
panulate to hemispheric, its ales loosely or closely imbricated in 
ew or many series, the outer successively shorter ; receptacle flat 
or subconvex; corollas regular, the limb 5-cleft; anthers sagittate 
at the base, not prolonged into caudate appendages ; achenes ribbed 
or ribless, truncate; pappus in two series, the outer short, of scales 
or bristles, the inner long, capillary. 
Herbs or shrubs, neariy all the species perennial, with usually 
leafy stems, branching at least at the inflorescence; heads in scor- 
pioid cymes, paniculate cymes, solitary in the axils, or terminal. 
About 600 species, of temperate and tropical America, Asia and 
Africa. 
Nomenclatorially the genus is grouped about the type species V. 
noveboracens:s, that being the first of Dillenius’ species cited by 
