42 PROCEEDINGS OF THE AMERICAN ACADEMY. 
acuta vel obtusiuscula vel brevissime acuminata basi cuneato-attenuata ; 
capitibus laxe corymbosis longe pedicellatis radiatis, disco leviter con- 
vexo ; involucri squamis paucis subaequalibus ovatis vel late oblongis 
acutis herbaceis hirsutulis ca. 7 mm. longis ; flosculis disci numerosis, 
corollis anguste tubulosis aurantiacis 7 mm. longis externe glabris, 
tubo proprio brevi basi ampliato ; faucibus multo longioribus paulo et 
gradatim amplioribus 5-nerviis, limbi dentibus 5 brevibus ovato-lanceo- 
latis acutiusculis apice puberulis; achaeniis turbinato-cylindricis 2.8 
mm. longis sericeis, pappi setis plumosis numerosis attenuatis plus 
minusve inaequalibus ca. 2.6 mm. longis; flosculis radiatis 5, ligulis 
albis late oblongis vel suborbicularibus patentibus apice 3-dentatis 
6-10 mm. longis. — River ledges, Balsas Station, alt. 600 m., 27 Sep- 
tember, 1905, Guerrero, Mexico, C. G. Pringle, no. 10,075 (type, in hb. 
Gray). This species is habitally Sinilar to 7. tenuifolia Rose, which, 
however, has smaller leaves and pappus decidedly longer than the 
achenes. 
ALINSOGA FILIFORMIS Hemsl., var. epapposa Robinson, n. var., 
habitu foliis inflorescentia, etc., formae typicae simillima; achaeniis . 
omnino epapposis apice annulo albido inconspicuo coronatis ; foliis caul- 
inis quam eis formae typicae paululo minoribus. —San Ramén, Du- 
rango, Mexico, 21 April-18 May, 1906, Dr. £. Palmer, no. 127 (type, 
in hb. Gray). This puzzling plant, which according to the notes of the 
collector was found in numbers, much dried, on stony ridges among 
trees and bushes, differs in its lack of pappus from any other Galinsoga. 
Its otherwise close correspondence with G. filiformis, however, would 
seem to show that it is merely a new instance of a calvous form of an 
ordinarily pappus-bearing species. Similar cases are familiar in sev- 
eral neighboring genera, e. g. Oalea, Jaegeria, ete. The phenomenon 
seems to present an ecological problem of interest, and it is to be ho 
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 
respects essentially identical forms, 
F'laveria bidentis Robinson, n. comb. Kthulia bidentis L. Mant. i. 
110 (1767). Flaveria chilensis Gmel. Syst. 1269 (1796); Johnston, 
Proc. Am. Acad. xxxix. 285 (1903). Milleria Contrayerba Cav. Ic. Pl. 
i. 2, t. 4 (1791). The author has examined the type of Lthulia hidentis 
in the Linnaean Herbarium and finds that, as given in the Index Kew- 
ensis, it is the plant which haslong passed as Flaveria Contrayerba. 
The Vienna rules of nomenclature require the restoration of the earlier 
specific name. 
Pericome macrocephala Robinson, n. sp., griseo-pulverula vel 
