ROBINSON: CONTRIBUTIONS FROM GRAY HERBARIUM. 255 
5-lobatum abrupte dilatatis— Palmares del General, valley of the 
Diquis, alt. 600 m., 9 January, 1898, HZ. Pittier, no. 12,030. 
The identification of this species has been obligingly verified by 
Dr. Otto Stapf at the Royal gardens of Kew. : 
2. M. riparia, Greenman, spec. nov. “Scandens, caule tereti 
striato glabro rubro-brunneo internodiis etiam ad 24 cm. longis; 
foliis oppositis petiolatis caudato-attenuatis apice acutis ultra mediam 
integerrimis basi saepe grosse dentibus paucis undulato-dentatis 
hastatis et sinu lato cordatis utrinque glabris; capitulis circa 
mm, altis basi 1—2-bracteolatis spicato-racemosis in paniculis 
pyramidatis dispositis, involucri squamulis anguste oblongis aliquid 
oblanceolatis acutiusculis vel obtusiusculis saepe plus minusve erosis 
glabris vel prope apicem inconspicue puberulis; pappi setis pallide 
rufo-brunneis, achaeniis glabris.— Thickets on the banks of the Rio 
Las Vueltas, Tucurrique, alt. 635 m., January, 1899, Ad. Tonduz, 
no. 13,163 (type in hb. Gr.). 
This species is most nearly related to M. hastata, Willd., and 
M. bogotensis, Benth. From the former it differs in having larger 
leaves, denser panicles, and longer heads; from the latter in the 
more decidedly hastate leaves, longer and more oblong involucral 
scales, flowers fully a third longer, and finally in the brownish, less. 
red pappus.” 
3. M. terostacnya, Benth., Pl. Hartw., 201 (1845); Hemsl., 
1. c., 103; Robinson & Greenman, /. ¢., 12; J. D. Smith, Enum. pl. 
Guat., v, 41.— Species foliis subcoriaceis reticulatis ovatis integerri- 
mis.— Suerre, Llanuras de Santa Clara, alt. 300 m., J. D. Smith, 
no. 6616. 
+ + Capitula pedicellata. 
4. M. Housronis, Willd. Spec. pl. iii, 1742 (1804); DC., 
Prodr., v, 190.— In woods, Shirores (Talamanca), alt. 100 m., Ad. 
Tonduz, no. 9316. 
* * Capitula in panicula thyrsoidea densa vel e glomerulis numerosis plus 
minusve globosis composita sessilia. 
+ Achaenium corolla longius. 
5. M. Pittieri, spec. nov. Paniculis exceptis glaberrima, ramis 
teretibus curvatis; foliis ovatis integerrimis longe caudato-acumi- 
natis basi rotundatis subcoriaceis 7 cm. longis, 3 cm. latis subtus 
