BOTANY. 
105 
which in the outermost flowers are often oblong, obtuse, and barely half the length of the 
corolla, but in the others lanceolate, mostly acutish, and almost as long as the corolla. Al¬ 
though the heads are larger than iu Douglas’ plant, described by De Candolle, and notwith¬ 
standing differences in the characters, yet I think that both these specimens and what I called 
Chamactis filifolia, in PI Fendl. p. 98, belong to C. glabriuscula, DC. For, although De Can¬ 
dolle in the generic character assigns 5 or 6 palern to the pappus, I find only four in Hooker’s, and 
his own specimens of C. glabriuscula, and these are in many flowers almost as long as the 
corolla, although in others (probably from the exterior part of the head) they are only half that 
length, as De Candolle described them. In this and the allied genera, little reliance is to be 
placed upon the particular size and shape of these paleae. 
Hymenopappus flavescens, Gray , PI. Fendl., p. 97, & PI. Wright. 2, p. 94. Dogtown 
prairies on the Pecos ; September. Also, the fine-leaved variety, La Cuesta, New Mexico; Sep¬ 
tember 29. 
Hymenopappus tenuifolius, Pursh, FI. 2 , p. 742; Torr. & Gray , FI. 2 , p. 372. Plains and 
dry arroyos from Hurrah creek to the G-alisteo ; September-October. The characters of all the 
species need revision. The length of the tube of the corolla and rise of the pappus varies con¬ 
siderably. This species probably includes H. corymbosus, Yar. Nuttallii, Torr. & Gray , l. c. 
Hymenopappus luteus, Nutt. ; Torr. & Gray , l. c.; Gray , PI. Wright. 2, p. 94. Sandy, 
denuded plains, on the Upper Canadian ; September. 
Riddellia tagetina, Nutt. ; Torr. in Emory's Rep. t. 5 ; Gray, PI. Fendl. p. 93. Plains, 
&c„, from the False Washita to the Llano Estacado ; August-September. 
Bahia oppositifolia, DC. Prodr. 5, p. 656; Gray , PI. Fendl. p. 99; Torr. in Sitgreaves’ 
Rep. t. 3. Prairies, &c., near Hurrah creek, N. W. Texas ; September. 
Bahia (Eriophyllum) confertiflora, DO. Prodr. 5, p. 657. Hill sides, Sonora, California. 
Bahia (Eriophyllum) lanata, Nutt.; DC. 1. c. California; banks of the Mokelumne river, 
and near Marysville; May : also, Napa Valley ; April: a form with the heads no larger than 
in B. tenuifolia, DC., but much branched to the top and leafy ; the lobes of the leaves rather 
broad and short, much laciniate and toothed. Knight’s ferry, on the Stanislaus ; May: the 
very large form, with the involucre almost half an inch in diameter ; the same with Hartweg’s 
No. 1787. 
Bahia (Eriophyllum) arachnoidea, Fiscli. & Lallem. Ind. Hort. Petrop., 1842; Gray , PI. 
Fendl. p. 100. B. latifolia, Benth. Rot. Voy. Sulph. p. 30. Bolinas Bay, California; April. 
Pappus reduced to a crown of minute palem, shorter than the diameter of the achenium. In a 
small collection made by Mr. Wm. A. Wallace, in the vicinity of Los Angeles, there is an in¬ 
teresting dwarf Bahia, which, with B. rubella, (an unpublished species found by Dr. Parry in 
the interior of California,) is intermediate in character between true Bahia and Eriophyllum, 
and both species are remarkable for having a conical receptacle. The characters are subjoined. 
Bahia Wallacei (sp. nov.) : annua, humilis, e basi diffusa ramosissima, albo-lanosissima ; 
pedunculis solitariis monocephalis ; foliis alternis obovatis vel spathulatis integerrimis ; invo¬ 
lucre hemisphmrico 8-phyllo lanuginoso, squamis subpatentibus margine scariosis discum subas- 
quantibus ; ligulis 8 rotundis subintegerrimis aureis ; styli fl. disci ramis cono acuto superatis ; 
receptaculo conico; acheniis glabellis; pappi paleis 10 brevissimis enerviis obtusissimis. 
Teyunga, near Los Angeles, California ; May ; illr. Wm. A. Wallace. Plant 2 or 3 inches 
high, but doubtless acquiring a greater size later in the season, white, with a dense covering of 
long and loose floccose wool, the branches terminated by peduncles of about an inch in length. 
Leaves numerous, 3 to 6 lines long, tapering into a slight petiole. Involucre 2| lines long and 
broad; the scales obovate-oblong, acute, membranaceous, with a hyaline margin. Ligules 1J 
to 2 lines in length and breadth, either retuse or obsoletely emarginate, three-toothed at the 
truncate-summit, abruptly contracted at the base into a very short tube. Disk-flowers, 20 or 
more, like those of true Bahia. Branches of the style much as in Bahia ambrosioides, but with 
a proportionately larger, triangular, more flattened, acute, and hispid cone or appendage, 
14 r 
