100 
BOTANY. 
margine lato hyalinis dorso subcarinatis obtusis mucronatis. Receptaculum parvum, alveolato- 
dentatum. Antberm ecaudatae. JStyli rami fl. foem. lineari-filiformes prorsus stigmatosi; fl. 
berm, plani appendice longa subulato-filiformi hispida superati. Acbenia conformia, vel disci 
substerilia, hirsuta, oblonga, compresso-pentagona, 5-nervia. Pappus e setulis 5 brevissimis ad 
nervos respondentibus, vix mauifestus. Herba annua, tenerrima ; caulibus filiformibus 2-4- 
pollicaribus erectis parce aracbnoideo-villosis ramisque paucis superne nudis monocephalis; 
foliis alternis filiformibus integerrimis ; floribus ut videtur luteis mox purpurascentibus. 
Aphantocileta exilis. (Tab. XI.) Hill-sides in the Napa Valley, California ; April 25. A 
delicate, almost capillary little plant, becoming glabrous ; tbe stems or branches naked above 
for an inch or so, and terminated by a head of 3 lines in length, below rather leafy, the leaves 
half an inch or more in length. Scales of the involucre greenish, except the margins, shining, 
nearly equaling the flowers. Corolla of the ray reduced to a tube, sheathing the style and 
about half its length, the apex somewhat obliquely truncate, with no vestige of a ligule. Disk- 
corollas with rather slender tubes ; the throat dilated, the border equally 5-toothed. Appendages 
of the style twice the length of the stigmatic portion. Mature achenia not seen. The five rudi¬ 
mentary setulm of the pappus do not exceed the hairs of the achenium in length. This curious 
little Composite exhibits that modification of the Asteroid style which is seen in Pentachaeta, 
Bradburia, Xanthisma, &c. From the technical characters, the genus would fall into De Can¬ 
dolles div. Solenogynem. But the genus to which I imagine it is most related has true rays, 
namely, the California genus Pentacheeta, Nutt.; from which it differs mainly in the fewer- 
flowered heads, the entire suppression of the ligule, the longer proper tube of the corolla in the 
disk, and the reduction of the five bristles f the pappus to minute rudiments. The latter 
character furnishes the generic name. 
Pericome caudata, Gray , PI. Wright. 2, p. 81. On rocky hills at San Domingo, New 
Mexico ; October. Also gathered by Dr. Henry on the Mimbres. 
Perityle nuda, Torr. in Bot. Emory's Mex. Bound, ined. : herbacea, ramosissima ; foliis 
plerisque alternis subcordato-rotundis 5-7-lobis crebre laciniato-dentatis incisisve cum ramulis 
junioribus subpubescentibus glanduloso-viscosis ; involucri sqamis oblongis ; ligulis oblongis 
discum baud superantibus ; appendieibus styli fl. hermaph. brevibus obtusis ; acbeniis oblongo- 
linearibus marginibus villosissimo-ciliatis ; pappo e squamellis hyalinis coroniformi-concretis 
pilis achenii brevioribus ; aristis omnino nullis. (On tbe Rio Gila, near the Pimo village. Dr. 
Parry.) Arroyos and canons at Williams’ River, and on hills near the Colorado of the West; 
February 7. Plant a span to a foot or more high, probably annual. Leaves half an inch or 
more in diameter, moderately lobed, much laciniated and toothed. Heads three or four lines 
in diameter. Scales of the involucre very thin, hispid-ciliate towards the summit. Disk deep 
yellow ; tbe small rays nearly white in the specimen. Receptacle convex, scrobiculate. Disk- 
corollas 4-toothed. Aehenia a line and a half long, the margin densely villous-hispid. This 
species, which has no awns to the pappus, together with P. aglossa, Gray , PI. Wright. 2, p. 107, 
which wants the rays, nearly effects a transition to Pericome, Gray , l. c., p. 81. The subjoined 
species, having (so far as the imperfect and scanty specimens show) no pappus at all, and no 
strong fringe on the margins of the achenium, carries the variations of this genus to an extreme. 
Perityle Fitciiii (Torr. ined.) : herbacea, humilis, viscosissimo-pubescens ; foliis oppositis et 
alternis cordato-rotundis inciso-crenatis dentibus crenulatis ; involucri squamis oblongis ; lig¬ 
ulis oblongis discum superantibus ; appendieibus styli fl. hermph. subulatis ; acheniis lineari- 
oblongis 3-4-nervatis ad nervos hirsutulis ; pappo plane nullo. California ; Rev. Mr. Fitch. 
Stems or branches three inches long, probably from a depauperate plant, clothed (as are the 
leaves in a lesser degree) with a glandular and very viscous villous pubescence. Leaves half an 
inch or less in diameter, subcordate, on slender petioles. Heads five to six lines in diameter. 
Scales of tbe involucre oblong, or oblong-lanceolate, villous, bearded at tbe tip. Receptacle con¬ 
vex. Flowers yellow ; the rays moderately exserted. Disk-corollas 4-toothed, the teeth spar¬ 
ingly bearded on the back. Branches of the style tipped with slender and acute, but rather 
