44 [100] BOTANY. 
margine lato hyalinis dorso subcarinatis obtusis mucronatis. Receptaculum parvum, alveolato- 
dentatum. Anthere ecaudate. Styli rami fl. foom. lineari-filiformes prorsus stigmatosi ; fl. 
herm. plani appendice longa subulato-filiformi hispida superati. Achenia conformia, vel disci 
substerilia, hirsuta, oblonga, compresso-pentagona, 5-nervia. _Pappus e setulis 5 brevissimis ad 
nervos respondentibus, vix manifestus. Herba annua, tenerrima; caulibus filiformibus 2—4- 
pollicaribus erectis parce arachnoideo-villosis ramisque paucis superne nudis monocephalis ; 
foliis alternis filiformibus integerrimis ; floribus ut videtur luteis mox purpurascentibus. 
APHANTOCHETA ExILIs. (Tab. XI.) Hill-sides in the Napa Valley, California; April 25. A 
delicate, almost capillary little plant, becoming glabrous; the stems or raniios 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 sky 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 3 
of the style twice the length of the stigmatic portion. Mature achenia not seen. The five rudi- 
mentary setulz of the pappus do not exceed the hairs of the achenium in length. This curious 
little Composita exhibits that modification of the Asteroid style which is seen in Pentacheta, 
Bradburia, Xanthisma, &c. From the technical characters, the genus would fall into De Can- 
dolles div. Solenogynee. But the genus to which I imagine it is most related has true rays, 
namely, the California genus Pentacheta, Nuét.; from which it differs mainly in the fewer- 
flowered heads, the entire suppression of the Hienla. 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 caupata, Gray, Pl. Wright. 2, p. 81. On rocky hills at San Domingo, New 
Mexico ; October. ‘Als gathered by Dr. Henry on the Mimbres. 
PERITYLE NuDA, Zorr. in Bot. E *s Mex. Bound. ined.: herbacea, ramosissima ; foliis 
plerisque alternis subcordato-rotundis 5—7-lobis crebre laciniato-dentatis incisisve cum saiaulis 
junioribus- subpubescentibus glanduloso-viscosis ; involucri sqamis oblongis; ligulis oblongis 
discum haud superantibus ; appendicibus styli fl. hermaph. brevibus obtusis ; acheniis oblongo- 
linearibus marginibus villosissimo-ciliatis ; pappo e squamellis hyalinis coroniformi-concretis 
pilis achenii brevioribus ; aristis omnino ‘inthis, (On the Rio Gila, near the Pimo village. Dr. 
Parry.) Arroyos and cafions 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 saveliigns very thin, hispid-ciliate towards the summit. Disk deep 
yellow ; the small rays nearly white in the specimen. Receptacle convex, scrobiculate. Disk- , 
corollas 4-toothed. Achenia 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, Pl. Wright. 2, p. 107, 
which wants the rays, nearly effects a transition to Pericome, Gray, l.c., p. 81. The mbjoined é; 
- 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. 
Periryie Freon (Torr. ined.): herbacea, hiiaitlin, viscosissimo-pubescens ; foliis oppositis et : 
alternis cordato-rotundis inciso-crenatis dentibus crentlatis ; involucri squamis oblongis ; lig- 
_ ulis oblongis discum superantibus ; appendicibus styli fl. Miriaph: subulatis ; acheniis lineari- 
oblongis 3-4-nervatis ad nervos hirsutulis; pappo plane nullo. California ; Bas: Mr. Fitch. 
Stems or branches three inches long, probably from a depauperate plant, caehad (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. 
- Seales of the involucre oblong, or oblong-lanceolate, villous, bearded at the tip. Receptacle con- 
vex. Flowers yellow; the rays moderately exserted. Thickoicalll 4-toothed, the teeth spar- 
ingly bearded on the back. Branches of the style tipped with slender and acute, but rather 
i. 
+ 
