y 





ROBINSON. — NEW SPERMATOPHYTES, CHIEFLY FROM MEXICO. 33 



is true Schultz well knew the Mexican plant, and ascribed to it the 

 same specific name (vanillosmoides), but under another generic name. 

 In describing this hitherto uncharacterized Mexican plant it seems 

 unwise to take up the nomen nudum E. vanillosmoides Hemsl., a name 

 inadvertently ascribed by Mr. Hemsley to Schultz, although, as we 

 have seen, Schultz used this binominal combination for quite a differ- 

 ent plant of Brazil. To avoid probable confusion the Mexican plant is 

 herewith given a new and distinctive name. The designation chosen 

 is suggested by the fact that some of the internodes below the inflo- 

 rescence are often swollen, hollowed, and provided with a somewhat 

 regular rounded ingress for small insects, probably ants. These en- 

 largements are not always present, and are doubtless of the nature of 

 galls developing through insect irritation, and later serving as nesting 

 places for the insects. 



Eupatorium hymenolepis Robinson, n. sp., gracile patente ramo- 

 sum ; caule tereti nigrescenti obsolete strigilloso ; ramis gracillimis 

 fiexuosis ; foliis oppositis longe petiolatis ovatis vel rhomboideis basi 

 abrupte angustata acuta excepta grosse serratis apice caudato-attenuatis 

 6-7.5 cm. longis 2-3.5 cm. latis tenuibus utrinque viridibus in nervis 

 adpresse pilosiusculis subtus haud pallidioribus supra sparse strigillo- 

 sis ; cymis parvis 6-10-capitulatis graciliter pedunculatis saepissime 

 nutantibus ; capitulis parvis 3.5 mm. longis ca. 18-floris ; involucri 

 companulati squamis valde inaequalibus albo-scareosis in media parte 

 tantum viridi-striatis, interioribus lineari-oblongis obtusissimis, exterior- 

 ibus brevioribus acutis vel acuminatis ; corollis albis 2.5 mm. longis 

 glabris basin versus modice angustatis ; dentibus 5 ovato-deltoideis 

 brevibus patentibus ; styli ramis albis paulo clavellatis ; achaeniis ni- 

 gris 5-angulatis 1.3 mm. longis basi albo-callosis sursum minute his- 

 pidulis, costis albidis ; pappi setis gracillimis ca. 20 corolla distincte 

 brevioribus. — Falls of Tzararacua, near Uruapan, Mexico, 28 January, 

 1907, C. G. Pringle, no. 10,355 (type, in hb. Gray). This species 

 somewhat resembles E. hymenopkyllum Klatt, but has slightly firmer 

 leaves 3-nerved from the very base instead of from a point somewhat 

 above the base ; it differs also in its involucre. From E. Gonzalezii 

 Robinson, to which it also bears some resemblance, it may be readily 

 distinguished by its more attenuate leaves and scarious involucral 

 scales. 



Eupatorium isolepis Robinson, n. sp., suffruticosum ; caulibus te- 

 retibus fiexuosis oppositirameis brunneo-purpureis pubescentibus, pilis 

 moniliformibus transverse purpureo-striatis ; foliis oppositis graciliter 

 petiolatis ovatis acuminatis serratis tenuibus subpellucidis subconcol- 

 oribus supra glabris subtus in nervis sparse pilosis penninerviis basi 



VOL. XLIII. — 3 



