ROBINSON. — NEW SPERMATOCYTES, CHIEFLY FROM MEXICO. 47 



faucibus cylindricis et limbo 5-lobato flavescentibus, lobis linearibus 

 recurvatis ; pappi setis laete albis tenuibus aequalibus corollam fere 

 aequantibus. — On pine-covered crater, cone, Uruapan, Micboacan, 

 Mexico, alt. 1680 m., 31 October, 1905, C. G. Pringle, no. 10,117 

 (type, in lib. Gray). Habitally near C. laevigata Sch. Bip., but differing 

 conspicuously in its considerably smaller beads, narrower carinate dark 

 purple involucral bracts, and less deeply lobed leaves. 



Perezia arachnolepis Robinson, n. sp., herbacea erecta a basi plus 

 minusve decumbenti 1.5 m. alta ; caule tereti striato purpureo glabro 

 usque ad inflorescentiam perlaxam simplici ; caudice fulvo-lanato ; radi- 

 cibus fibriformibus duris atrobrunneis ; foliis oblanceolato-oblongis vel 

 oblongo-linearibus sessilibus sagittato-amplexicaulibus usque ad 1.6 

 dm. longis 1.7-5.8 cm. latis firniis utrinque viridibus reticularis supra 

 glabris subtus vix pallidioribus sparse puberulis vel glabris argute den- 

 ticulatis apice acutis vel breviter acuminatis ; inflorescentia perlaxa 

 S-16-capitata ; capitibus ramos elongatos sursum valde squamosos ter- 

 minantibus ca. 3 cm. diametro ; involucro valde turbinate, bracteis 

 pedunculi in squamas involucri gradatim transeuntibus anguste lanceo- 

 latis vel linearibus apice subulatis margine arachnoideo-lanatis ; co- 

 rollis purpureis 1.3 cm. longis glabris; antberis etiam purpureis ; 

 acbaeniis atrobrunneis sursum hispidulis 3 mm. longis. — Canons, 

 Chapala Mountains near Guadalajara, Jalisco, Mexico, 13 December, 

 1889, C. G. Pringle, no. 2935 (type, in bb. Gray), and in barranca of 

 Rio Blanco near Guadalajara, 29 November, 1905, C. G. Pringle, no. 

 13,668 (bb. Gray). 



Perezia lepidopoda Robinson, n. sp., precedenti valde affinis ber- 

 bacea erecta 7-8 dm. vel ultra alta glaberrima s ; caule purpureo recto 

 tereti striato foliosissimo in parte superiore ramos simplices valde 

 patentes multi-bracteatos unicapitatos gerente ; foliis anguste oblongis 

 vel oblongo-linearibus attenuates acutissimis saepissime recurvatis vel 

 reflexis conduplicatis subcartilagineis concoloribus sessilibus sagittato- 

 vel bastato-amplexicaulibus argute et dupliciter sinuato-dentatis 6-13 

 cm. longis 8-22 mm. latis utrinque glabris viridibus reticulato-venosis, 

 dentibus lanceolato-subulatis 2-4 mm. longis divaricatis acutissimis ; 

 ramis pedunculiformibus ca. 12 cm. longis a bracteis numerosissimis 

 fere a basi sed praesertim apicem versus tectis, bracteis inferioribus 

 1-2 cm. longis anguste lanceolatis sagittatis denticulatis, superioribus 

 anguste linearibus peracutis adpressis bine inde contortis in squamas 

 involucri gradatim transeuntibus ; capitibus (omnibus valde immaturis) 

 usque ad 3 cm. diametro multifloris ; involucri turbinati squamis 

 lineari-lanceolatis acutissimis viridibus vel purpurascentibus striatulis 

 obsolete puberulis. — Valley near Cuernavaca, Morelos, Mexico, alt. 



