PLANTE FENDLERIANZ. 71 
(ceruleis vel albis) angusto-linearibus involucrum subduplo superantibus; pappo yérsia- 
tente e paleis crassis cartilagineis uniserialibus basi concretis coroniformi, fl. radii brevis- 
simo subzequali, disci inequali, paleis 1 — 3 in squamellis aristiformibus productis corollam 
atque achenium late obovatum calloso-marginatum pl. m. brevioribus. — Sides of high 
mountains, Santa Fé Creek, and prairies on the Mora River; June to Aug. (353). — 
The most striking species of the genus; the upright stems 6 or 7 inches high froma 
strong tap-root, terminated by solitary heads resembling those of T. grandiflora or still 
larger (an inch in diameter). Lowest leaves 2 inches long; the upper successively 
smaller and more sessile. Ray achenia fertile, narrower than those of the disk, which 
are a line and a half in length, flat, with thickened callous margins. ‘The pappus is of 
a much firmer texture than in the other species, more paleaceous, the scales few, coroni- 
form-concreted, and perfectly persistent ; the 1 to 3 longer ones (of the disk) subulate- 
aristiform, half or two thirds the length of the mature achenium. — Lieut. Abert also 
gathered this species on Purgatory River. 
+341. Eereres numizis, Torr. & Gray! Fl. 2. p. 411, in obs, (Leucopsidium hu- 
mile, Benth. Pl. Hartweg, p. 18.) Valley of Santa Fé Creek; May. (373.) — This is 
also in Dr. Gregg’s North-Mexican collection. The plant is more canescent and the 
heads smaller than in E. Arkansana, and the pappus, as noted in the FY. N. America, l. ¢., 
is a small crown, the edge of which is evenly cleft into a fringe of numerous setulose teeth, 
The tube of the disk corolla sometimes becomes thickened and indurated at the base, as 
in E. Arkansana.* 
* It is difficult to say whether this genus should be referred to the Anthemidez or the Asteroidex ; but if 
Leucopsidium, DC., has been correctly joined to it, so likewise should be Aphanostephus, DC., which differs in 
no character of any generic consequence. In E. RamosissiMa (Aphanostephus ramosissimus, DC., and also 
A. Riddellii, Torr. § Gray) the coroniform pappus is minutely fringed, just as in E. humilis. I have had it in 
cultivation for two years, along with E. Arkansana, with which it well accords in habit. The heads are 
smaller, but more numerous, and are borne in profusion throughout the summer; the rays are white, and usu- 
ally finely tinged with pink or purple underneath. I have not observed any thickening of the disk-corollas. — 
I no longer doubt that Keerlia skirrobasis of De Candolle is founded on a depauperate state of Egletes Arkan- 
sana. Dr. Gregg collected specimens of E. ramosissima at Monterey and Buena Vista. —I subjoin the 
characters of some new heterochromous Composite-Asteroidez of Northern Mexico. 
PSILACTIS, Nov. Gen. 
radiatum, heterochromum ; fl. radii ligulatis, numerosis, uniseriatis, foemineis ; disci 
e squamis lanceolatis subherbaceis imbricatum, 3 -4- 
Ligule 60-80, elongate, angusto-lineares. Corolle 
Achenia 
Capitulum multiflorum, 
tubulosis hermaphroditis. Involucrum disco brevius, 
seriale. Receptaculum convexum, subalveolatum. 
disci 5-dentatee. Styli rami breves, appendice triangulari acutiuscula complanata hirtella terminati. 
