622 PROCEEDINGS OF THE AMERICAN ACADEMY. 



its discoid heads and in the character of its corolla and achene, this 

 species resembles 0. curvijiorus (R. Br.) Hemsl., but it is readily dis- 

 tinguished by its different inflorescence, the heads being very short-pedi- 

 celled ; the leaves are longer and relatively narrower, and carefully 

 examined the throat of the corolla is found to be campanulate and the 

 deltoid segments of the limb straightish, while in 0. curvijiorus the 

 throat is very short and funnel-formed, the limb being of lanceolate 

 spreading-recurved segments. 



Var. glabratus (Coulter), n. comb. 0. curvijiorus, var. glabratus 

 Coulter, Bot. Gaz. xx. 50 (1895). — Foliis tenuioribus utrinque viri- 

 dibus supra scabridis subtus solum in nerviis venisque obscure 

 puberulis ; inflorescentia floribusque ut formae typicae. — Volcano of 

 Jumaytepeque, Department Santa Rosa, Guatemala, alt. 1850 m., 

 November, 1892, Heyde & Lux, no. 4235 (of Mr. J. Donnell Smith's 

 distribution). 



Otopappus tequilanus (Gray), n. comb. Zexmenia tequilana 

 Gray, Proc. Am. Acad. xxii. 425 (1887), pro parte, i. e. quoad pi. Pal- 

 meri no. 359. — Foliis tenuioribus levioribus vix rugosis vix reticulatis. 



Var. acuminatus (Wats.), n. comb. Zexmenia tequilana Gray, Proc. 

 Am. Acad. xxii. 425 (1887), pro parte, i. e. quoad pi. Palmeri no. 394. 

 0. acuminatus Wats. Proc. Am. Acad. xxvi. 140(1891). — Foliis quam 

 ea formae typicae multo rugosioribus subtus tomentosis reticulato- 

 venosis. 



Cosmos Nelsonii Robinson & Fernald, n. sp., herbaceus perennis 

 6-8 dm. altus ; caule tereti erecto subsimplici glabro ; foliis oppositis 

 petiolatis bipinnatifidis 5-8 cm. longis, 4-9 cm. latis, segmentis lance- 

 olatis acutis plerisque 1-2 cm. longis, 4-6 mm. latis integris vel 2-3- 

 lobatis supra puberulis subtus paulo pallidioribus margine scabriusculo- 

 ciliolatis basi cuneato-decurrentibus, rhachi glabro gracili vix alato ; 

 capitibus saepe 3 nutantibus 4-4.5 cm. (radiis inclusis) diametro; 

 pedunculis 9-12 cm. longis ; involucri campanulati squamis exteriori- 

 bus ca. 8 lineari-oblongis acutatis ca. 1 cm. longis 1.7 mm. latis saepe 

 5-nerviis, squamis interioribus ovato-oblongis quam exteriores haud 

 longioribus crebre striatis margine tenuibus pallidisque ; flosculis disci 

 flavis ; antheris linearibus brunneo-violaceis ; achaeniis graciliter fusi- 

 formibus glabris ; aristis pappi saepissime 4 retrorsum barbatis quarum 

 duae longae, aliae multo breviores ; ligulis 8-10 ellipticis vel oblongis 

 pallide purpureis ca. 2 cm. longis 1 cm. latis. — Vicinity of Cerro San 

 Felipe, Oaxaca, Mexico, alt. 2900-3300 m., 1 September, 1894, Nel- 

 son, no. 1176, in part (type, in hb. Gray). — Unfortunately specimens of 

 Bidens pilosa L. were by some oversight or transposition of labels 

 distributed under the same number. — Further material of C. Nelsonii 



