ROBINSON. — NEW SPERMATOPHYTES, CHIEFLY FROM MEXICO. 8 
puberula oppositiramea ; caulibus fragilibus subteretibus hovitet 
angulato-striatis glabriuscnlis brunneis paulo lignescentibus ; foliis 
triangulari- -hastatis 5-6 cm. longis 4—5 cm. latis caudato-attenua tis sub- 
integris basi abrupte cuneatis, auriculis subacuminatis, petiolo gracili 
2-2.7 cm. longo ; inflorescentiis corymbosis terminalibus 6-8 cm. latis 
subplanis 9-15-capitulatis ; pedicellis gracilibus rectis vel leviter arcuatis 
sursum modice incrassatis pubescentibus 1-2 cm. longis ; capitulis 1.7 
cm. longis 1.2 cm. diametro homogamis multiflosculosis; involucri cupula 
ovoideo-subcylindrata 1.2-1.4 em. longa griseo-puberula multistriata 
dentibus brevissimis caudiformibus plus minusve patentibus ; corollis 
laete flavis 1 cm. longis, tubo proprio gracillimo 3 mm. longo glandu- 
loso-puberulo, faucibus anguste tubulosis sarsum paululum ampliatis, 
dentibus limbi 4 brevibus ovato-oblongis obtusis ; achaenlis nigrescen- 
tibus anguste oblongis valde compressis margine et apice fimbriato- 
ciliatis. — A showy plant growing in large masses on talus in moun- 
tains near San Ramén, Durango, Mexico, 21 April-18 May, 1906, Dr. 
E. Palmer, no. 69 (type, in hb. Gray). In habit and floral strue- 
ture this species closely approaches P. caudata Gray, but differs from 
it conspicuously in having heads nearly twice as large. The form of 
the involucre also is different, being ovoid-subcylindric in the species 
here described while it is considerably more campanulate in P. 
caudata. 
Loxothysanus Robinson, n. gen, Compositarum Heleniearum. 
Capitula homogama. Involucrum campanulatum vel turbinatum, 
squamis paucis uniseriatis aequalibus pleramque obovatis vel oblance- 
olatis acutis vel saepissime obtusiusculis herbaceis puberulis. Recep- 
taculum parvum planiusculum onustum. Flosculi modice numerosi 
tubulosi hermaphroditi fertiles. Corollae albidae, tubo proprio ques 
posdage vel glandulifero fauces campanulatas subaequante, limbo 5 
lobato. Styli rami breves recurvati filiformes vix infra apicem incras- 
sati brevissime et obtusiuscule appendiculati. Antherae basi breviter 
sagittato-auriculatae apice obtuse appendiculatae. Achaenia gracilia 5- 
angulata sursum hispidula deorsum longiuscule angustata. Pappi 
squamae 5-8 oblongae erosae eis in margine quam aliis 
valde brevioribus. — Frutices humiles vel suffrutices ramosi erecti vel 
procumbentes. Capitula pauca mediocra axillaria vel laxe corymbosa. 
Flosculi vel omnes regulariter 5-dentati vel exteriores obscure subbila- 
biati. Folia opposita petiolata, limbo ovato vel orbiculari paucilobato 
vel vix crenato. (Nomen a Aofés, obliquus, et Picavos, fimbriae, pap- 
- pum unilateraliter abbreviatum designat.) 
L. sinuatus (Less.) Robinson, n. comb., foliis ovatis sinuatis pler- 
umque 3-lobatis basi obtusis vel snbtrancatis vel late cordatis ; capitulis 
