﻿72 PLANTiE FENDLERIA.N.r.. 



342. Guttierrezia Euthami^:, Ton. §• Gray, Fl. 2. p. 193. Bent's Fort, on the 

 Arkansas; and at Santa Fe, on gravelly hills; Aug. to Sept. (388.) 



oblonga, pubemla. Pappus radii nullus ; disci pilosus, uniserialis, corolla brevior, setis scabris. — Herbae Mex- 

 icans;, graciles, annuae, subviscosae, erectae, ramosae ; ramis laxe paniculatis monocephalis ; foliis linearibus ; 

 capitulis parvis ; ligulis caoruleis, disco flavo. 



S 1. P. asteroides : ramis capitulisque viscoso-pubescentibus ; foliis integerrimis ; involucri squamis line- 

 ari-lanceolatis subaequalibus 2-3-seriatis laxis ; ligulis elongatis ; pappo corolla disci paulo breviore e setis 

 circ. 18 fere osqualibus. — Llanos, in the Sierra Madre, west of Cbihuahua, 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 Nova>Angliae, 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 Heteropappeaj with the character a little enlarged. — I have 

 flowering branches of a second species, from Coulter's Mexican collection, viz. : — 



f 2. P. Coulteei : subglabra ; foliis (ramealibus) rigidiusculis plerisque dentatis ; involucri squamis 3-4- 

 seriatim imbricatis inaequalibus oblongo-lanceolatis obtusiusculis vix glandulosis ; pappo corolla disci tertia 

 parte breviore, e setis circ. 40 valde inaequalibus. — Mexico, Coulter, no. 295. 



ACH^ETOGERON, Nov. Gen. 



Capitulum multiflorum, radiatum, heterochromum ; fl. radii ligulatis, numerosissimis, pluriseriatis, fcemi- 

 neis; disci tubulosis hermaphroditis. Involucrum subbiseriale, e squamis aequalibus linearibus dorso villosis. 

 Receptaculum convexum, subalveolatum. Ligulae circ. 400, elongate, lineari-filiformes. Corolla; disci 5- 

 dentatae. Anthera cuspidato-apiculatae. 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. — Ilerba perennis, hispida, 

 facie Erigerontis pumili; caulibus simplicibus monocephalis ; ligulis albis, disco flavo. 



A. Wislizeni. — 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, Nutt.), except as to the pappus, which refers it to the Bellidese, 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, hemisphaericum, radiatum, heterochromum ; fl. radii uniserialibus, fremineis ; 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. Ligulae circ. 20, elongatce. Corolla; disci (plusquam 



