OF ARTS AND SCIENCES. 33 



gerrimis imisve latioribus raro laciniatis ; capitulis multo minoribus 

 globoso-ovatis fuscis; receptaculo luto-ovato; ligulis uullis. — S. Ari- 

 zona, Coulter (359, distributed as of Californian collection), Thurber 

 (346, wrongly referred to H. pubendum in Bot. Mex. Bound.), Pringle 



* * Capitulum heterogamum radiatum. Am. Bor. et Mex. 



1- Eamosse, pleiocephalae ; foliis (sp. ultima excepta) plerisque 1-3-pinnati- vel 



ternati-partitis. 



++ Pappi paletE majusculse in acumen saltern aristiforme producta9. 



A. ODORATA, Gray, Pi. Fendl. 101. E radice annua diffusa ; foliorum seg- 

 mentis filiformibus niollibus ; capitulis parvulis sparsis ; bracleis involucri 

 extern! 7-8 busi tantum coalitis. — Cephulophora anthemoides, Less, ex DC. 

 Hjjmenoxijs odorata, DC. Prodr. v. 6G1 ; Deless. Ic. iv. 42. 



A. BiExxis, Gray, Proc. Am. Acad. xiii. 373. E radice bienni erecta, 1-2- 

 pedalis ; foliorum segmentis linearilius rigidulis ; capitulis subcyinosis majus- 

 culis liemisphsericis ; involucri laxioris bracteis externis 12-14 vix carinatis ; 

 ligulis totidem angusto-cuneatis. — A. liichurdsonii, var. canesceus, 'Ei&ion, Bot. 

 King, 175 ; Gray, Bot. Calif, i. 394, forma nana cinerea. 



A. RiciiARDSONii, Nutt. E caudice niulticipiti perennis, spitbamaea ad 

 pedalem, fastigiatim ramosa; foliis rigidulis l-2-ternat()partitis, segmentis 

 filiformi-linearibus, petiolis radicalibus in axillis l.uiosis ; capitulis parvulis; 

 involucro externo G-9-angulato e bracteis crasso-carinatis infra medium cupulato- 

 connatis ; ligulis cuneatis. — Picradenia Ilichardsonii, Hook. Fl. i. l!17, t. 108. 



•M. ++ Pappi palese breviores mutica) : caules crecti 1-2-pedales e radice perenni, 



vel bienni. 



A. Vaseyi, Gray, Proc. Am. Acad. xvii. 219. Subglabra; capitulis mnjus- 

 culis fastigiato-cymnosis ; involucro campanulato, externo e bracteis 7-9 carinatis 

 longe in cupulam 7-9-dentatam interius asquantem connatis ; pappi paleis 

 oblongis tenuibus obtusis vel obtusiusculis corolla disci dimidio brevioribus; 

 segmentis foliorum linearibus saltem trifidis. — Still known only by tbe few 

 specimens collected in New ^Mexico by George R. Vasrij. 



A: CooPERi, Gray, Proc. Am. Acad. vii. 394. Puberula, 2-3-pedalis e caudice 

 ut vidctur perenni, superne paniculato-ramosa ; capitulis sparsis ; involucro 

 fere bemispliffirico, externo e bracteis G-10 basi connatis ; pappi paleis latis 

 obtusissimis apice erosis liyalinis corolla disci plus dimidio brevioribus ; foliis 

 inferioribus biternatim quinatimve superioribus tantum 3-5-partitis in segmenta 

 fere filiformia. — S. E. California, Cooper, an incomplete specimen, in wliicb tbe 

 pappus seemed to be of firm texture. S. W. Arizona, on liigh slopes, Tanner's 

 Canon, Lemmon, complete specimens : pappus tbin and byaline. 



A. liusBTi. E radice lignescente (ut videtur bienni?) ultrapedalis, stricta, 

 glabra, apice fastigiatim ramosa, polycepbala ; foliis rigidulis linearibus, radi- 

 calibus elongatis angustis cum caulinis inferioribus aliis integerrimis aliis 

 tripartitis, superioribus omnino integerrimis; capitulis parvis (lin. S altis) con- 

 fertis ; involucro externo e bracteis 7-8 subulato lanceolatis ima basi tantum 

 connatis ; ligulis totidem lin. 2-3 longis quadratis ; pappi paleis 5 quadratis seu 

 latissime cuneatis truncatis rigidulis prorsus enerviis tubum proprium corollse 



VOL. XIX. (n. S. XI.) 3 



