OF ARTS AND SCIENCES. 175 



upward and subscabrous ; cauline leaves alternate, 2-2^ inches in 

 diameter, deeply 3-lubed, broadly cordate, scabrous above, pubes- 

 cent beneath, lobes serrate, acuminate, the middle one more or less 

 pandurif orm : petioles 9 lines long, winged: wings decurrent for 

 some distance upon the stem: heads exclusive of the rays an inch 

 in diameter: involucre hemispherical; bracts striate, with subfolia- 

 ceous tips, the outer shorter, rounded at the apex, the inner equal- 

 ling or slightly surpassing the disk, acute: raj^s about 8-10, deep 

 yellow, 9 lines long; chaff scarious, carinate, very sharply acumi- 

 nate, with or without lateral teeth: achenes 4-angled but decidedly 

 compressed, narrowed downward, dark in color, often mottled with 

 light red: pappus none or in the same head consisting of a ring 

 of short unequal rather rigid teeth. — Las Palmas, San Luis Potosi, 

 October, 1890 (n. 3675). This plant has so perfectly the habit 

 and characters of a Tithonia that it should certainly be referred to 

 this genus notwithstanding its short sometimes obsolete pappus. 

 From T. tagetiflora, Desv., it differs in its involucre; from T. dir 

 versifolia, Gray, in its considerably smaller heads and shorter rays, 

 as well as in achenes and pappus. 



Verbesixa Potosina. Stem rather stout, furrowed, pubes- 

 cent, leafy to the summit: leaves alternate, lance-oblong, attenu- 

 ate, acute, sessile, auriculate, denticulate on the subrevolute edges, 

 roughish pubescent above and finely dotted with the enlarged white 

 bases of the hairs; white tomentose beneath, less so on the veins: 

 heads rather numerous, 5-6 lines in diameter, loosely corymbose, 

 peduncles pubescent, 1-3 inches in length: scales of the involucre 

 lanceolate, sharply acuminate, canescent, rather loosely imbricated, 

 not equalling the disk flowers ; rays about 12, very small, scarcely 

 exceeding the involucre, yellow : disk strongty convex : chaff scari- 

 ous, keeled, pubescent near the acuminate tips : disk flowers deep 

 yellow: achenes oblanceolate, 1^ lines in length, notched at the 

 summit and with a slight angle on each face; wings moderately 

 broad, upwardly ciliate, subacute above. — Mesas, Hacienda de An- 

 gostura, San Luis Potosi, July, 1891 (n. 5113). Near V. auricu- 

 lata, DC. (ex char.), but differing in its radiate heads, narrower 

 leaves, and lanceolate acuminate involucral scales. 



Verbesina Pringlei. Fruticose: branches covered with a 

 whitish cortex; branchlets strongly angled, glabrous or nearly so: 

 leaves opposite, lanceolate, attenuate, acute, rather coarsely and 

 irregularly serrate-dentate, of harsh texture, scabrous above, pu- 

 bescent but scarcely rough beneath, 3-5 inches long, 1-1^ inches 



