96 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 
able to separate it solely by the pappus.— Gen., 2, 364; Hemsl., 1. e., 
163. JVedelia subflexuosa , 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, X. C. Smith, no. 896, Monte Alban, Pringle , no. 4859, 
C. L. Smith, no. 244, Valley of Etla, X. C. Smith , no. 849, 
Alvarez , no. 723; Costa Rica, Prov. of San Jose, J. Donnell 
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 so, canescent-sericeous beneath. 
15. G. canescexs, Robinson. 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 infiorescence long, 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. 
-t- Heads somewhat larger (of medium size) rather few, mostly solitary or 
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. Pappus none : species of Mexico. 
16. G. ovata, Gray. Stem 4 to 8 dm. long or more, covered 
with a short spreading pubescence: leaves ovate, subsessile, 3 to 7 
cm. long, 2 to 4 cm. broad, serrate, mostly acute: heads 3 to 8, 
long, unequally long-peduncled, 1.5 to 1.8 cm. in diameter (exclu¬ 
sive of rays), many-fiowered; the bracts of the involucre narrow, 
loose, very numerous.— Proc. Amer. acad., 19, 4.— Chiapas, Qhies- 
breght, no. 554; Oaxaca, Sierra de San Pilipe, altitude 1,800 to 2,500 
m., Pringle , no. 5674, Conzatti and Gonzdlez, no. 551. 
17. G. eiebmaistnii, Ivlatt. Smaller: leaves sessile, 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 
diameter; bracts 2-seriate, rather few, lanceolate ; rays about 9, con¬ 
spicuously 5-nerved. — Leopoldina, 23, 90. Microcephcdum lieb - 
