380 PROCEEDINGS OF THE AMERICAN ACADEMY. 



summis alternis denique minimis linearibus; capitulis paniculatis; 

 disco 11-15 mm. alto 8-12 mm. diametro; involucri squamis 4-seriatis 

 exterioribus sensim brevioribus striatis margine et apice minute 

 glanduloso-strigosis lanceolatis interioribus lanceolato-attenuatis disco 

 subaequalibus; radiis ca. 12 oblongo-ovalibus flavis 6.5 mm. longis; 

 disci flosculis 8 mm. longis (tubulo 1.5 mm.) puberulo-glandulosis 

 flavidis denique purpurascentibus ; paleis 11.5 mm. longis lateraliter 

 sublaceratis dorso et apice subherbaceo acuminato glanduloso- 

 pubescentibus ; acheniis 5 mm. longis 2.4 mm. latis appresse pubes- 

 centibus interdum subglabris supra ciliatis cahis vel cum aristis 2 

 temiibus sursum ciliatis ad 2.2 mm. longis. 



Specimens examined: Sonora: Alamos, lG-30 Sept. 1890, Palmer 

 741 (coTYPES in Gray Herb. andXat. Herb., no. 46131). — Distributed 

 as Encclia vicxicana, from which it is very distinct. 



++ ++ Leaves unlobed; stems merely glandular; heads 9-10 mm. high, 5-7 



mm. wide. 



3. S. tenuis (Fernald) Blake, n. comb. Base and lowest leaves 

 unknown; stem finely and thickly glandular, only the ultimate 

 branches of the inflorescence somewhat setose; leaves deltoid-ovate, 

 cordate with broad shallow sinus, acute, crenate, glandular-puberu- 

 lent and somewhat strigose, on glandular and setose barely margined 

 petioles 1-2.5 cm. long, with their bases united into rounded crenate 

 foliaceous disks ; inflorescence much branched, the branches slender, 

 the very slender peduncles 2-10 cm. long; heads short-cylindric; 

 scales 3^-seriate, distinctly graduated, the outer ovate, the inner 

 lance-acuminate, glandular-puberulent, ciliate above, striate-veined; 

 rays about 8, yellow, oval, 6 mm. long, barely bidentate, hairy on tube 

 and slightly pubescent on back; disk-corollas 5.8 mm. long, glandular- 

 puberulent on tube and pubescent above, yellow becoming purplish; 

 pales 7-8 mm. long, glandular-puberulent; achenes dark-mottled, 

 appressed-pubescent, awnless, 5 mm. long, 3 mm. wide. 



Encelia tenuis Fernald, Proc. Am. Acad, xxxiii. 94 (1897). 

 Specimens examined: Guerrero; rather scarce on edge of a corn- 

 field, Nov. 1894, Palmer 96 (FGN, type collection). 



* * Petioles sometimes auriculate, not connate at base into disks; anMuals or 



perennials. 



-»- Rays yellow. 



++ Involucral scales distinctly unequal, the outer ovate, 3-4-seriate. 



= Achenes glabrous and awnless. 



X Petioles not auriculate. 



4. S. EXARiSTATA Gray. Annual, erect, much branched above, 

 the stem and branches striate, co\ered with a fine glandular pubescence 



