382 PROCEEDINGS OF THE AMERICAN ACADEMY. 



6.5 mm. longis (tubulo 2 mm.) infra i^landuloso-puberulis supra 

 glanduloso-pilosis flavis denique obscurantibus ; paleis latis 9 mm. 

 longis appresse pubescentibus dorso et apice ciliatis; acheniis atris 

 truncatig glabris calvis 4.5 mm. longis 2.8 mm. latis. 



Specimens examined: Tamaulipas: weed in waste places, growing 

 in clusters, vicinity of Tampico, alt. 15 m., 10 Mar.-19 Apr. 1910, 

 Palmer 250 (type in Gray Herb.). 



X X Petioles aiuiculate. 



6. S. eurylepis Blake, n. sp., herbacea foliis inferioribus et basi 

 invisis; caule striato sparse puberulo et pilis longis mollibus nonnullis; 

 foliis remotis maxima ex parte alternis ovatis acutis basi subtruncatis 

 subintegris vel infra dentatis utrimque pubescentibus pilis brevibus 

 patentibus basi tuberculatis venas secundum subhispidis, petiolo vix 

 marginato puberulo-glanduloso ad basin latas in auriculas integras 

 ampliato; capitulis plerumque glomeratis in pedunculis longis nudis 

 terminalibus, eradiatis 1.2-1.4 cm. altitudine 1-1.5 cm. diametro; 

 involucro discum subaequante 3-4-seriato squamis sensim gradatis 

 interioribus oblongis 7-9.5 mm. longis 2-2.5 mm. latis extimis ovalibus 

 4.5 mm. longis 2.5 mm. latis acutis striatis puberulo-glandulosis et 

 subpilosis supra purpureo-brunneis; corollis disci flavis denique 

 purpurascentibus 8 mm. longis (tubulo 2.2 mm.) infra et in dentibus 

 puberulis; paleis 8.5 mm. longis apice pilosis a latere subdentatis; 

 acheniis nigricantibus emarginatis calvis glabris 5.5 mm. longis 3.4 mm. 

 latis. 



Specimens examined: San Luis Potosi: district Cuidad del i\Iaiz 

 near Gallinas, Feb. 1888, C. & E. Seler 684 (type in Gray Herb.). 



= = Achenes pubescent and biaristate. 

 X Tips of pales and inner scales purple ; leaves not tomentose beneath ; Mexican . 



7. S. lagascaeformis DC. Annual, erect or rarely somewhat 

 spreading, usually much branched; stems and l)ranches striate, glandu- 

 lar-pubescent and pilose particularly near the nodes; leaves opposite 

 below, alternate in the inflorescence, broadly deltoid-ovate, unlobed or 

 rarely hastately 3-lobed, the margin crenate or subentire, acute, the 

 base truncate or cordate with broad sinus, beneath granular-puberulent, 

 pilose along the A'eins, or when young almost tomentose, abo\'e strigil- 

 lose, the hairs tuberculate-based, intermixed with longer looser ones, 

 the blades 3-12 cm. long, 2-13.5 cm. wide, on purplish naked glandular- 

 puberulent pilose-fringed petioles 1.5-5 cm. long; heads numerous, 

 cymose-panicled, the branches somewhat pilose and stipitate-glandu- 

 lar; heads cylindric becoming hemispheric, 10-12 nun. high, 5-8 mm. 



