BARTLETT. — DESCRIPTIONS OF MEXICAN PHANEROGAMS. 635 



Viburnum cuneifolium, n. sp. Frutex 3-5 m. altus novellis ferru- 

 gineis lepidotis. Lepides glandulos 8 brunneos radiantis gerentes. 

 Rainuli modice crassi obscurissime angulati grisei glabrati ; lenticellis 

 brunneis ; gemmis nudis ; internodiis 2-6 cm. longis. Foliorum laminae 

 juventate secus nervos perexigne lepidotae, aetate utrinque glabratae 

 virides late cuneatae leviter denticulatae, in specimine fiorenti maximae 

 3.5 cm. longae 3.5 cm. latae, basi acutae, apice truncatae emarginatae; 

 petioli 2-4 mm. longi anguste membranaceo-marginati, subtus persis- 

 tenter ferrugineo-lepidoti, supra glabri atropunicei. Inflorescentiae 

 umbelliformes diametro ca. 6 cm., floribus exceptis lepidotae, in ramulis 

 lateralibus terminales, radiis 4 primariis 1-1.5 cm. longis. Bracteae 

 bracteolaeque minutae glabrae obtusae scariosae saepe puniceo-tinctae. 

 Pedicelli usque ad 3 mm. longi. Flores omnes conformes. Calycis tubus 

 glaber subcylindricus 2 mm. longus ; limbus expansus lobis brevibus 

 obtusis. Corolla alba rotata 4 mm. loriga lobis suborbicularibus. Sta- 

 mina tubo inserta, corollae lobis aequilonga. Stylus perbrevis fere 

 nullus. Stigma capitatum obscure trilobum. — Collected in tbe Sierra 

 Madre above Monterey, Nuevo Leon, alt. 760 m., 27 March, 1906, 

 Pr ingle, no. 10,234 (type, in hb. Gray). Viburnum cuneifolium is very 

 readily distinguished from all the other Mexican species of the genus 

 by its broadly cuneate emarginate leaves. It is allied to Viburnum 

 prunifolium L. 



Parthenium Arctium, n. sp., fruticosum, ramis juventate niveo- 

 tomentosis aetate glabris ochraceis ; internodiis quam foliis ca. 10-plo 

 brevioribus. Folia deltoidea crenato-dentata usque ad 10 cm. lata 

 30 cm. longa, apice angustata acuta vel obtusa, basi cordata abrupte in 

 petiolum usque ad 5 cm. longum decurrentia, supra viridia tenuiter 

 arachnoideo-tomentosa, subtus niveo-tomentosa. Inflorescentia termi- 

 nalis corymbosa a foliis longe superata omnibus partibus dense albo- 

 tomentosa. Bracteae minutae nee deorsum foliis similes. Capitula 

 densius aggregata diametro et altitudine ca. 3-5 mm. Involucri squamae 

 10 biseriatae exteriores oblongae apice obtusae interiores suborbiculares 

 basi truncatae apice obtusissimae. Radii flores 5, tubo brevi ; limbo 

 oblongo apice dilatato truncate emarginate. Achenia (immatura) nigra 

 compressa ovoidea 1.5 mm. longa epapposa ad margines singula palea- 

 rum aristis florum duorum sterilium adnata. Disci flores ca. 18 in 

 axillis palearum pubescentium cuneatarum positi. — Southwestern 

 Chihuahua, August to November, 1885, Palmer, no. 123 (type, in hb. 

 Gray). P. A rctium, so named because its leaves so closely resemble those 

 of the common burdock, and P. Stramonium Greene constitute a well 

 denned group in De Candolle's section Partheniastrum. From the other 

 species of the section they differ in having the inflorescence much ex- 



