BOTANY. 
101 
short, appendages. Achenia compressed, usually with two approximate nerves at each margin, 
which are barely hirsute, terminated by a small, disk-shaped, rather prominent areola, which 
is entirely naked, there being no trace of a pappus. 
Baccharis Douglasii, DC. Prodr. 5, p. 400 ; Torr. & Gray, FI. 2, p. 259 ; excl. syn. P. 
Pingraea, &c. Along streams ; Napa Valley, (male,) and Cocomungo, (female); California, 
March and April. The leaves often denticulate. 
Baccharis sergiloides, (sp. nov.): suffruticosa, glabra, confertim ramosissima ; ramis raniu- 
lisque angulatis rigidis articulatis smpissime apliyllis ; foliis dum adsunt parvis spathulatis 
uniDerviis, ramulorum ad bracteas minimas reductis, capitulis parvis in ramulos confertis sub- 
sessilibus, masculis magis glomeratis; involucro obovato, squamis multiseriatis appressis glabris 
oblongis, seu interioribus lanceolatis, foem. acutis, masc. omnibus obtusis ; receptaculo conico 
subpaleaceo ; acheniis glabris ; pappo brevi. Dry arroyos, fifty miles west of the Colorado, 
western New Mexico. A very bushy, broom-like plant, with small heads, apparently abundaut 
on the Gila, where Colonel Emory and others have gathered specimens. 
Baccharis Texana, Gray, PI Fendl. p. 75. Prairies, &c. Coimfnche plains, Northwestern 
Texas ; September. 
Baccharis salicina, Torr. & Gray, FI. 2, p. 258. Sand-banks of the Canadian, near the Shaw¬ 
nee villages ; August. 
Pluchea FceTiDA, DC. Prodr. 5 , p. 452. On the Canadian ; August. 
Tessaria (Phalacrocline) borealis, Gray, PI. Fendl. p. 75, & PI. Wright l, p. 102. Wil¬ 
liams’s river ; February. 
Stylocline gnaphalioides, Nutt, in Trans. Amer. Phil. Soc., 1 . c. ; Torr. & Gray, FI . 2, p. 
267; var. Bigelovii: foliis spatulato-oblongis vel sublinearibus ; paleis receptaculi fructiferis 
dorso multo magis lanatis. (Tab. XIII.) California; along rivulets near Knight’s ferry, on the 
Stanislaus river ; May. Plant a span high, rather stouter, and with larger and broader leaves, 
and larger heads than in our specimens of Nuttall’s plant; which, however, are poor, and perhaps 
depauperate. The heads are not larger in Dr. Bigelow’s plant than those of S. gnaphalioides 
are described to be ; but the palem are more woolly on the back, which perhaps is more deeply 
saccate, especially in the upper ones. In both, however, the saccate portion enclosing the fruit is 
larger than the hyaline wing in the uppermost fructiferous palem. The male flowers are sub¬ 
tended by one or two small and linear glabrous palern ; their scanty pappus is sometimes barely 
denticulate, sometimes barbellate-toothed. 
Evax (Hesperevax) caulescens. Psilocarphus caulescens, Tenth. PI. Hartio. No. 1812, p. 
319. (Tab. XI.) Napa Valley, California; April 25. This plant is no Psilocarphus, but 
essentially an Evax. The achenia are obcompressed, and the paleae barely concave (not com¬ 
plicate) : the latter are of a firm, chartaceous texture, and persistent on the villous cylindrical 
receptacle, or the uppermost (which form an involucrate verticil around the 6-8 sterile flowers) 
herbaceous, all pointless, or nearly so. Achenia smooth. 
Psilocarphus tenellus, Nutt. 1. c. Near San Francisco and Mark West’s creek, California ; 
April. Quite distinct from P. globiferus, to which Nuttall’s P. brevissimus and P. Oreganus 
are likelyAo belong. 
Micropus Californicus, Fisch. & Meyer; DC. Prodr. 7, p. 283. Napa valley and Corte Ma¬ 
dera, California; April. 
• Eclipta erecta, Linn. River banks, Shawneetown, Arkansas ; August. 
Blennosperma Californicum, Torr. & Gray, FI. 2, p. 272. Rancho of San Geronimo, Cali¬ 
fornia ; April. 
Polymnia Uvedalia, Linn. Woods, on the Lower Canadian ; August. 
Melampodium cinereum, DC. Prodr. 5, p. 518. Prairies, on the Canadian ; September. 
Berlandiera Texana, DC. Prodr. 5, p. 517. Bottom lands and prairies, on the Canadian 
and Walnut creek ; August. 
