72 PLANTZ FENDLERIANZ. 
342. Gurtmerrezia Evrnamin, Torr. § Gray, Fl. 2. p. 193. Bent’s Fort, on the 
Arkansas; and at Santa Fé, on gravelly hills; Aug. to Sept. (388.) 
oblonga, puberula. Pappus radii nullus; disci pilosus, uniserialis, corolla brevior, setis scabris. — Herbe Mex- 
icane, graciles, annuz, subviscosee, erect, ramose ; ramis laxe paniculatis monocephalis; foliis linearibus ; 
capitulis parvis ; ligulis czruleis, disco flavo. 
1. P. asTEROIDES: ramis capitulisque viscoso-pubescentibus ; foliis integerrimis ; involucri squamis line- 
ari-lanceolatis subeequalibus 2—3-seriatis laxis ; ligulis elongatis; pappo corolla disci paulo breviore e setis 
cire. 18 fere equalibus. — Llanos, in the Sierra Madre, west of Chihuahua, Dr. Wislizenus. — Stem two feet 
high, slender. Cauline leaves 1 or 2 inches long, seldom 2 lines wide, membranaceous, somewhat pubescent 
and ciliate, mucronulate ; those of the branchlets small, more pubescent and viscous-glandular. Heads about 
as large as in Aster ericoides ; the involucre rather to be compared with that of Aster Nove-Anglie, equally 
glandular. — This genus would stand between Dieteria and Aster, except from the want of pappus in the ray, 
which would refer it to De Candolle’s subdivision Heteropappez with the character a little enlarged. —I have 
flowering branches of a second species, from Coulter’s Mexican collection, viz. : — 
2. P. Counrert: subglabra ; foliis (ramealibus) rigidiusculis plerisque dentatis; involucri squamis 3—4- 
seriatim imbricatis inawqualibus oblongo-lanceolatis obtusiusculis vix glandulosis; pappo corolla disci tertia 
parte breviore, e setis circ. 40 valde ineequalibus. — Mexico, Coulter, no. 295. 
ACHETOGERON, Nov. Gen. 
Capitulum multiflorum, radiatum, heterochromum; fl. radii ligulatis, numerosissimis, pluriseriatis, foemi- 
neis; disci tubulosis hermaphroditis. Involucrum subbiseriale, e squamis zequalibus linearibus dorso villosis. 
Receptaculum convexum, subalveolatum. Ligule circ. 400, elongate, lineari-filiformes. Corolle disci 5- 
dentate. Anthers cuspidato-apiculate. Styli rami breves, cono brevissimo complanato terminati. Achenia 
(immatura) oblonga, compressa, 4-nervia, parce hirtella. Pappus in disco et radio conformis, simplex, e paleis 
5— 6 laciniato-denticulatis basi in coronam achenio quadruplo breviorem concretis. — Herba perennis, hispida, 
facie Erigerontis pumili; caulibus simplicibus monocephalis ; ligulis albis, disco flavo. 
A. Wistizenr.— Llanos, in the Sierra Madre, west of Chihuahua, in an open valley, among grass, — 
Stems 10 inches high, erect or ascending, rough-hirsute, slender, leafy nearly to the summit. Leaves alter- 
nate, linear, somewhat 3-nerved ; the upper sessile and entire ; the lower sparingly incised-toothed, tapering 
to the base. Head three fourths of an inch in diameter, including the rays, which are 3 or 4 lines long, ex- 
cessively numerous, and very slender. Pappus nearly equalling the proper tube of the corolla. — The plant 
is entirely like a true Erigeron (so much so, that, except for the more numerous rays, it might be taken for E. 
pumilum, Nuit.), except as to the pappus, which refers it to the Bellidew, DC., and is remarkably large and 
conspicuous for that subdivision. It represents, as it were, the section Phalacroloma deprived of the bristles ; 
in allusion to which character the generic name is contrived. 
DIPLOSTELMA, Nov. Gen. (non Raf.) 
Capitulum multiflorum, hemisphericum, radiatum, heterochromum ; fl. radii uniserialibus, foemineis ; disci 
tubulosis hermaphroditis, omnibus fertilibus. Involucrum pluriseriale ; squamis lineari-oblongis, coriaceo-char- 
taceis, subcarinatis, margine scariosis, apice fimbriato-ciliatis, regulariter imbricatis, appressis, exterioribus 
sensim brevioribus. Receptaculum planum, nudum. Ligule cire. 20, elongate. Corolle disci (plusquam 
