OF ARTS AND SCIENCES: JANUARY 26, 1870. 193 



-i— Involucri limbus omnino prater costas petaloideo-scariosus, rotato- 

 expansus, breviter 6-lobus. Caulis erectus : capitula densa. 



1. C. membranacea, Bentb. Eriog. 1. c. p. 419, t. 7, f. 1. Arane- 

 oso-lanata ; foliis bracteisque conformibus linearibus mucrone debili ; 

 capitulis solitariis paucisve secus ramos subsimplices dissitis, fructiferis 

 iis Scabiosarum similibus ; involucro prater basim et costas validas in 

 aristularn excurrentes prorsus scarioso, limbo maxime dilatato. — Not 

 rare in California ; a most marked species. 



2. C. stellttlata, Bentb. PI. Hartw. no. 1937. Hirto-pubescens, 

 fastigiato-ramosa ; foliis eaulinis fere linearibus ; bracteis acerosis 

 pungenti-aristulatis pilis rigidioribus birsutis ; capitulis subcymosis ; 

 involucri tubo angusto insigniter ?equaliter 6-costato (lin. 2 longo), 

 limbo abrupto prater costas validas in aristularn excurrentes toto albo- 

 scarioso quadruplo longiore ; perigonii segmentis obcordato-bilobis ; 

 antheris oblongo-linearibus. — Known as yet only in Hartweg's collec- 

 tion from the valley of the Sacramento. 



3. C. Douglasii, Benth. Eriog. 1. c. Humilis, villoso-pubescens ; 

 foliis eaulinis spathulatis seu spathulato-lanceolatis ; bracteis acerosis 

 pungentibus ; capitulis saepius umbellatis globosis ; involucri circa lin. 

 2 longi tubo intequaliter angulato limbo brevi abrupto (albo vel roseo) 

 cum aristis subulatis inrequalibus 2 - 3-plo longiore ; perigonii seg- 

 mentis apice truncatis subcrenulatis ; antheris lineari-oblongis. — The 

 genuine C. Douglasii has apparently been collected only by Douglas, 

 and lately by Prof. Brewer, — by the latter on very dry hills in 

 Santa Margarita Valley, sparingly and in depauperate specimens. 

 The expanded scarious limb of the involucre, when not torn down, is 

 angulate-lobed in the manner of the preceding, i. e. the stout costa? 

 which project as awns are connected high up by the scarious mem- 

 brane. Bentham's var. Hartioegi must be united to C. pungens. 



h— -t— Involucri limbus 5-partitus, nempe dentibus ad faucem usque 

 discretis aut margine aut fere toto albo-scariosis. Caules laxi, a 

 basi ramosi, saepius difFusi ; pube plus minus villosa : capitula 

 plerumque irregulariter paniculata : bracteas pungenti-aristatae, 

 supremse aristiformes. — Adsunt fere semper involucra pauca 

 pracociora solitaria dentibus accrescentibus herbaceis immar- 

 ginatis. 



4. C. diffusa, Benth. PI. Hartw. no. 1938. Pilosula, tenella; foliis 

 plerisque radicalibus spathulatis seu oblongo-ovatis (cum petiolo 4-12 

 VOL. VIII. 25 



