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. 
uli modice crassi obscurissime angulati grisei glabrati ; lenticellis 
brunneis ; gemmis nudis ; internodiis 2—6 em. longis. Foliorum laminae 
juventate secus nervos perexigue lepidotae, aetate utrinque glabratae 
virides late cuneatae leviter denticulatae, in specimine florenti maximae 
3.5em. longae 3.5cm. 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 1-1.5cm. longis. Bracteae 
bracteolaeque minutae glabrae obtusae scariosae saepe puniceo-tinctae. 
Pedicelli usque ad 3 mm. longi. Flores omnes conformes. Calycis tubus 
glaber subcylindricus 2mm. longus; limbus expansus lobis brevibus 
obtusis. Corolla alba rotata 4mm. longa lobis suborbicularibus. Sta- 
mina tubo inserta, corollae lobis aequilonga. Stylus perbrevis fere 
nullus. Stigma capitatum obscure trilobum. — Collected in the Sierra 
Madre above Monterey, Nuevo Leon, alt. 760 m., 27 March, 1906, 
Pringle, 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. é 
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 10cm. lata 
30cm. longa, apice angustata acuta vel obtusa, basi cordata abrupte m 
petiolum usque ad 5cm. longum decurrentia, supra viridia tenuiter 
arachnoideo-tomentosa, subtus niveo-tomentosa. Inflorescentia term!- 
nalis corymbosa a foliis longe superata omnibus partibus dense albo- 
tomentosa. Bracteae minutae nec 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 truncato emarginato. Achenia (immatura) nigra 
compressa ovoidea 1.5 mm. longa epapposa ad margines singula palea- 
rum aristis florum duorum sterilium adnata. Disci flores ca. 18 im 
axillis palearum pubescentium cuneatarum positi. — Southwestern 
Chihuahua, August to November, 1885, Palmer, no. 123 (type, in hb. 
Gray). P. Arctium, so named because its leaves so closely resemble those 
of the common burdock, and P. Stramonium Greene constitute a well 
defined group in De Candolle’s section Partheniastrum. From the other 
species of the section they differ in having the inflorescence much ex- 
