12 I 1.1 1>IN CHB AMERICAN ACADEMY. 



acnta vel obtusiuscula wl br< saminata baai cuneato-attenuata ; 



capitibua laxe corymbosis longe pedicellatia radiatis, disco li con- 



rexo; involucri squamis paucis subaequalibus ovatis vel late oblongia 

 aoatia herbaoeia hirsutulis oa. 7 nun. longia ; flosculia disci aumeri 

 oorollia anguste tubolosia aurantiaoia 7 mm. longia externe glabris, 

 tubo proprio brevi basi ampliato; faucibus multo Longioribus paulo et 

 gradatim amplioribua 5 oerviis, limbi dentibua 5 brevibua ovato lanceo- 

 latis aoutiasculia apice puberulis; acbaeniis turbinato-cylindricis 2.8 

 mm. Longia Bericeis, pappi Betia plnmosis uumerosis attenuatis plua 

 minnave inaequalibua ca. •_'.'"> nun. longis; floscuks radiatis •">, ligulia 

 all. is late oblongia vel suborbicularibus patentibna apice •'; denl 

 6-10 nun. Longis. — River Ledges, Balsas Station, alt. lionm., -j; Sep- 

 tember, 1905, (iuerrero, Mexico, C. G. Pringle, do. l"."7."> type, in lib. 

 Ghray . This species is babitally similar to '/'. tenuifolia Rose, which, 

 however, ha- smaller leaves and pappus decidedly Longer than the 

 achenes. 



GLALINSOOA FDLIFORMIS HemsL, var. epapposa Robinson, n. var., 

 habitu foliis inflorescentia, etc., formae typicae simillima; acbaeniis 

 omnino epapposis apice annulo albido inconspicuo coronatia ; foliis caul- 

 inis quam eis formae typicae paululo minoribus. — San Ramon, Du- 

 rango, Mexico, •-'! April-is .May, 1906, Dr. /•,'. Palmer, no. 127 (type, 

 in hh. Gray). This puzzling plant, which according to the - of the 

 collector was found in numbers, much dried, on Btony ridure- .inong 

 trees and bushes, differs in its lack of pappus from any other Galins 

 It- otherwise close correspondence with G. Jiliformis, however, would 

 em to -how that it is merely a new instance of a calvoua form of an 

 ordinarily pappus bearing species. Similar cases are familiar in sev- 

 eral neighboring genera, e. g. Calm, Jaegeria, etc. The phenomenon 

 seem- I i present an ecological problem of interest, and it is to be hoped 

 that collectors who have an opportunity to study these plants in the 

 field may bear the matter in mind and endeavor to learn the conditions 

 which determine the presence and absence of pappus in these in other 

 respecl - essentially identical forms. 

 , Flaveria bidentis Robinson, n. comb. Ethulia bidentis L. Mant. i. 

 110 LZ67). Flaveria ckilensis Gmel. Syst 1269 (1796); Johnston, 

 Proo. Am. Acad, xxxix. 285 (1903). Miliaria Contrayerba Cav. Ic. PI. 

 i. •_', t. I 1791 . The author has examined the type of Ethulia bidentis 



. in the LinnaeaD Herbarium and finds that, a- given in the Index Kcw- 



it La the plant which has long passed as Flaveria Contrayerba, 



The Vienna rule- of nomenclature require the restoration of the earlier 



Specific name. 

 Pericome macrocephala R binson, n. sp., griseo-pulverula vel 



