6 PROCEEDINGS OP THE AMERICAN ACADEMY. 



Michoacan: mountains near Patzcuaro. Pringle, no3. 4099, 4264 

 (both in bb. Gr.). 



Excluded Species. 



S. occiDENTALis, DC. Protlr. V. 497 (1836), is a clerical error for 

 Siegesbeckia occidentalis, Walt, (not L.), i. e. Verbesina occidentalis, 

 Walt. Fl. Car. 213. 



S. GLABRA, Wats. Proc. Am. Acad, xxiii. 277 (1888), is Jaegeria 

 petiolaris, Robinson, Proc. Am. Acad. xxxv. 316 (1900). 



S. PORTORiCENSis, DC. Prodr. v. 497 (1836), is a clerical error for 

 Siegesbeckia portoricensis, Bert. 



S. SUBNUDA, Robinson & Seaton, Proc. Am. Acad, xxviii. 108 (1893), 

 is unquestionably the long unidentified ScUoa plantaginea, HI>K. Nov. 

 Gen. et Spec. iv. 266, t. 394 (1820). The genus Selloa appears from 

 this new material to be very close to Sabazia, but it may be distinguished 

 by its filiform chaff and acaulescent habit, as well as by the presence of a 

 pappus of 2 to 6 filiform awns so caducous as to have escaped detection 

 in the original examination of Mr. Pringle's plant. 



11. REVISION OF THE MEXICAN AND CENTRAL AMER- 

 ICAN SPECIES OF TRIXIS. 



B. L. RoBixsoN AXD J. M. Gkeexman. 



TRIXIS, P. Browne. (Name from rpt^o's, threefold, from the 

 three-cleft corollas.) The Mexican and Central American species are 

 shrubs (except T. michuacana) with alternate to ovate-oblong rarely 

 linear entire or dentate pinnately veined leaves and loosely paniculate to 

 densely corymbose rarely thyrsoid or subsolitary heads ; involucre mostly 

 double, of 1 to 5 unequal linear to ovate more or less foliaceous outer 



disk-flowers are said to be 4-toothed, wliile tliey are 5-tootlied in tlie Sabazia ; the 

 leaves are described as linear-lanceolate, altliough in the Sabazia they are ovate or 

 ovate-lanceolate ; the raj's are said to be numerous and capillary, a mode of de- 

 scription which surely no one would applj' to the some ten flat elliptic-oblong con- 

 spicuously toothed rays of the Sabazia ; the involucre is said to be equal, while in 

 the Sabazia the scales are very unequal. It seems to us mucli more likely that 

 Baillon was right in referring Abasoloa to Ecli/ita with which in essentials the de- 

 scription corresponds far better. It should be remarked that Pringle's uo. 4921 has 

 on re-examination proved to be Sabazia Litbuuuuiii, Klatt. 



