204 PKOCEEDINGS OF THE AMERICAN ACADEMY. 



margine tenuissimis scariosis ; corolla achaenium subaequanti ; costis 

 achaenii nigrescentis sursum hispidulis, intervallis glabris. — Proc. Am. 

 Acad. xvii. 206 (1882). Eupatorium setiferum et E. ciispidatum herb. 

 Pavonii ex Grayo, 1. c. — Mexico, hb. Pa v. nunc hb. Boiss. Species ut 

 videtnr nunquam iterum lecta. 



3. B. SESSiLiFOLiA Greenman, caule erecto tereti crispe pubescenti 

 6 dm. alto superne oppositirameo ; foliis arete sessilibus late ovatis basi 

 subtruncatis duplice serratis acutis supra laete viridibus subtus paulo 

 pallidioribus 2.5-4.5 cm. longis 1.4-3.5 cm. latis utrinque pubescentibus, 

 dentibus apiceque setuliferis ; panicula diffusa ; capitulis graciliter et 

 longiuscule pedicellatis ca. 17-floris; involucri squamis anguste lance- 

 olatis attenuatis viridibus albicostatis, margine scariosa; corolla 4.8 

 mm. longa ad insertionem filamentorum obscure constricta, superne 

 non ampliata ; styli ramis leviter clavellatis ; achaeniis nigrescentibus 

 3.5 mm. longis in facie* interior! 1- obverse plernmque 3-costatis. — 

 Proc. Am. Acad. xl. 35 (1904). — In collibus calcareis prope pagum 

 Yautepec, Morelos, Mexico, Pringle, n. 9865 ; in rupibus calcareis 

 convallis praeruptae Iguala, Guerrero, altitudine 915 m., Pringle, n. 

 10,322 ; et prope urbem Acapulco, Palmer, n. 625 (expeditionis Oct. 

 1894-Mar. 1895 factae). 



4. B. SETOSA Gray, herba a basi decumbenti suberecta gracilis ca. 

 6 dm. alta ; caule tereti rubescenti minute crispeque puberulo opposi- 

 tirameo ; foliis ovatis argute serrato-dentatis 1.2-3 cm. longis 8-15 

 mm. latis membranaceis utrinque viridibus tenuiter puberulis, petiolis 

 4 mm. longis ; capitulis ca. 20-floris in axillis foliorum superiorum ped- 

 icellatis vel numerosioribus et in panicula plus minusve diffusa dispos- 

 itis 5 involucri squamis anguste oblongo-lanceolatis attenuatis saepe 

 purpurascentibus ; corolla et pappi setis achaenium superantibus ; 

 achaeniis facie interiori planiusculis obscure 1-nervatis dorso 2-nerva- 

 tis. — Proc. Am. Acad. xv. 29 (1879); Hemsl. Biol. Cent.-Am. Bot. 

 ii. 102 (1881). Barroetia setosa (Gray) Hook, f & Jacks. Ind. Kew. 

 i. 276 (1895). — San Luis Potosi, altitudine 1830-2440 m., Parr^/ & 

 Palmer, n. 353 ; in collibus calcareis prope pagum Cardenas, San Luis 

 Potosi, Pringle, nn. 3319, 3320. 



5. B. suBULiGERA (Schauer) Gray, perennis saepe basi suffrutescens ; 

 caulibus 1 vel saepe pluribus teretibus suberectis laxe ramosis fere a 

 basi foliatis 4-8 dm. altis crispe tomentellis vel puberulis ; foliis del- 

 toideo-ovatis crenato- serratis utrinque pubescentibus vel puberulis 1-3 

 cm. longis 9-18 mm. latis, apice saepe obtusiusculo et dentibus saltim 

 1-3 posticis vel saepe omnibus cum setis munitis ; capitulis ca. 30- 

 floris 1 cm. altis ; involucri squamis linearibus vel lineari-lanceolatis 

 attenuatis plerumque viridibus ; coroUis gracilibus 5.5-7 mm. longis ad 



