ROBINSON. — NEW SPERMATOPHYTES, CHIEFLY FROM MEXICO. 43 



puberula oppositiramea ; caulibus fragilibus subteretibus leviter 

 angulato-striatis glabriusculis brunneis paulo lignescentibus ; foliis 

 triangulari-bastatis 5-6 cm. longis 4-5 cm. latis caudato-attenuatis 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 multiiiosculosis; involucri cupula 

 ovoideo-subcylindrata 1.2-1.4 cm. 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 sursum paululum ampliatis, 

 dentibus limbi 4 brevibus ovato-oblongis obtusis ; achaeniis nigrescen- 

 tibus anguste oblongis valde compressis margine et apice fimbriato- 

 ciliatis. — A sbowy plant growing in large masses on talus in moun- 

 tains near San Ramdn, Durango, Mexico, 21 April-is May, 1906, Dr. 

 E. Palmer, no. 69 (type, in hb. Gray). In habit and floral struc- 

 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. 



/'audata. 

 Loxothysanus Robinson, n. gen , Compositarum Heleniearum. 

 Capitula homogama. Involucrum campanulatum vel turbinatum, 

 squamis paucis uniseriatis aequalibus plerumque 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 gracili 

 puberulo 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 exteriore achaenii 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 Ao^d?, obliquus, et Ovo-avos, fimbriae, pap- 

 pum unilateraliter abbreviatum designat.) 



L. sinuatus (Less.) Robinson, n. comb., foliis ovatis sinuatis pler- 

 umque 3-lobatis basi obtusis vel subtruncatis vel late cordatis ; capitulis 



