96 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
able to separate it solely by the pappus.— Gen., 2, 364; Hemsl.,1. ¢., 
163. Wedelia subfleewosa, Hook. and Arn., Bot. Beech., 435.— 
Realejo, Nicaragua, Sinclair; Orizaba, Botteri, no. 435 (acc. to 
Hemsl.). To this species of which we have seen but a single 
achene we refer with doubt specimens from the following localities : 
Vera Cruz, Valley of Cordova, Bourgeau, no. 1961; Oaxaca, Jaya- 
catlan, Z. C. Smith, no. 896, Monte Alban, Pringle, no. 4859, 
C. Smith, no,_244, Valley of Etla, Z. C. Smith, no. 849, 
Alvarez, no. 723; Costa Rica, Prov. of San José, -/. Donnelt 
Smith, no, 4871. A better knowledge of the type of this species 
will doubtless justify at least a varietal separation of some of the 
specimens here mentioned. 
++ ++ Leaves entire or nearly g » ganescent-8 “sericeous beneath. 
15. _G. CANESCENS, Robitiéon. "Leaves opposite, ovate, subtrun- 
cate or subcordate at the base, acute or often obtuse at the apex, 
finely gray pubescent above, silky and silvery beneath; petioles 
2 cm. long: branches of the naked inflorescence tong. bearing few 
clustered heads at their ends. — Proc. Amer. acad., 27, 174.— San 
Luis Potosi, brackish marsh, Las Tablas, Pringle, no. 3611, alkaline 
plains, Hacienda de Angosture, Pringle, no. 3763. 
+ + Heads somewhat larger (of medium “> rather few, mostly solitary oT 
borne by 3’s at the ends of the branches 
++ Outer bracts of the involucre shorter than or little exceeding the inner: 
species of Mexico, Cent. America, and Andean South America 
- = Leaves sessile or petioles short (2 to 8 mm. long). 
a. nh pa my 5 se of bee. 
16. G. ovata, Gray. Stem tt 8 dm. long or more, covered 
with a short spreading pubescence: leaves ovate, subsessile, 3 to 7 
em. long, 2 to 4 em. broad, serrate, mostly acute: heads 3 to 8, 
long, unequally long-peduncled, 1.5 to 1.8 em. in diameter (exclu- 
sive of rays), many-flowered; the bracts of the involucre narrow, 
loose, very numerous.— Proc. Amer. acad., 19, 4.— Chiapas, Ghies- 
breght, no. 554; Oaxaca, Sierra de San Filipe, altitude 1,800 to 2,500 
m., Pringle, no, 5674, Conzatti and Gonadlez, no. 551. 
17. G. LIEBMANNIIL, Klatt. “8 “salle? ‘leaves ieanile: cordate, 
green on both : sides, 2 cm. long, nearly as broad: heads few, 1 or 2 
or perhaps 3 at the ends of the branches; involucres 6 mm. in 
west bracts 2-seriate, rather few, envege” rays about 9, con- 
_ 5d-nerved.— Leopoldina, 2 » 90. Microcephalum lieb- 
