OF ARTS AND SCIENCES. 277 



Aplopappus (Stenotus) niveus. Caudex much branched, the 

 herbaceous leafy ascending or decumbent stems 6 inches long and 

 equalling the naked peduncle, white floccose-woolly throughout : leaves 

 spatulate, 1 or 2 inches long by 3 to 9 lines broad, obtuse: peduncle 

 1- flowered, somewhat glandular-scabrous above; heads 6 lines long; 

 involucre glandular-scabrous, not tomentose, of narrow acuminate 

 bracts in 3 or 4 unequal rows : rays about 20, deep orange : achenes 

 white-silky. — Gravelly borders of streams in the Sierra Madre, Chi- 

 huahua; C. G. Pringle (n. 1300), Sept., 1887. 



Sanvitalia tenuis. Annual, erect, a span high or less, slender, 

 branching, rather sparingly rough-pubescent : leaves linear, ^ to 1 inch 

 long, sessile, entire : heads small, sessile, the turbinate-campanulate to 

 hemispherical involucres 2 lines high, of 1 or 2 series of thin obovate 

 obtuse nearly equal bracts ; receptacle small, depressed-conical, the 

 chaff thin and that of the disk conduplicate : ligules very short, cune- 

 ate-obovate, 3-toothed ; disk-flowers yellow becoming brown : achenes 

 nearly alike in ray and disk, with two very slender deciduous awns or 

 none, those of the ray usually more or less granular, of the disk with 

 a thinner membranous margin. — In the Sierra Madre, Chihuahua, at 

 7-8,000 feet altitude; C. G. Pringle (n. 1304), Sept., 1887. 



Siegesbeckia orientalis, Linn. A variety of this widely dis- 

 tributed species with small heads and very obtusely angled oblong- 

 obovate achenes. — At Arroyo Aucho in the Sierra Madre, Chihuahua ; 

 C. G. Pringle (n. 1283), Oct., 1887. 



Sabazia glabra. Glabrous throughout, branching from the base 

 upward, a span high, lax : leaves entire, linear-oblong, obtuse, atten- 

 uate to a short petiole, 1 to \\ inches long: peduncles 1-flowered, ex- 

 ceeding the leaves; outer involucre of 12 to 15 equal thin-herbaceous 

 bracts, the inner embracing the achenes of the ray : ligules conspicu- 

 ous, 3 or 4 lines long, rather broadly linear, 2-3-toothed, yellow 

 toward the base, white or pinkish above: receptacle convex, broad. — 

 In shallow water on the pine plains at the base of the Sierra Madre, 

 Chihuahua; C. G. Pringle (n. 1295), Sept., 1887. The concave in- 

 ner bracts of the involucre would refer this species strictly to Jagceria, 

 but in other respects it agrees better with Sabazia. 



Lepachys (Obeliscaria) Mexicana. Eough with a short spread- 

 ing pubescence and somewhat hirsute, 2 feet high : lower leaves lance- 

 olate, attenuate to a long petiole, acuminate, subcrenately toothed, the 

 cauline pinnatifid with a few short spreading segments : heads long- 

 pedunculate, 1 to 1J inches long: rays yellow, narrowly oblong-spatu- 

 late, 15 lines long: achenes epappose, with obtuse naked margins, and 



