Pk ee 
above, and middle sized: flowers with purple rays. It seems to be 
undescribed. Valley of the Del Norte 
lidago elongata, Wutt. Vailey of the Gila. 
- Linosyris graveolens, Torr. and Gr. Chrysocoma dvucuncalall 
des, Pursh. A shrub about two feet high, and nal beige yellow heads 
of flowers. Abundant on the highlands between the Del Norte 
and the Gila. 
Aplopappus saeemionas; DC. On Ocaté creek, &c., called Pinette 
by the natives. 
Menziesii, Torr. and Gr. 8. dentatus: leaves coriaceous, 
strongly dentate or pinnatifid, toothed, glutinous. Abundant in the 
great desert between the Colorado and the Cordilleras of Califor- 
nia. Another form of this species was found near St. Diego, with 
the stem and the leaves clothed with a copious loose pubescence, 
and Pe seers of the leaves few and small. 
Grindelia. An apparently new species of this genus was found 
in ascending the Cordilleras of California, but the flowers had 
fallen from the heads, and our specimen is therefore scarcely suffi- 
cient for determination. The stem is very smooth and whitish; the 
leaves are oblong, clasping at the base, spinulose, serrate and elab- 
rous, and the scales of the involucre are very acute, but scarcely 
recurve 
Chrysopsis canescens, Torr. and Gr. Near Ocaté creek. 
~C. echioides, Benth. in Bot. Sulph.p. 25. Valley of the Gila. 
Perityle, Benth. in Bot. Sulph. | A new species of this genus 
(P. Emoryi, nob.) was found in ascending the Cordilleras of Cali- 
fornia. It differs from P.-Californica of Bentham in its smaller 
and much more deeply lobed leaves, narrower achenia, which are 
very hairy on the margins, and in other characters. 
Baccharis Douglasii, DC. Valley of the Gila. Besides this 
there are three other species of Baccharis in the collection, noné — 
of which are described in the Flora of North America, but we can- 
not yet pronounce them new. 4 timers 
Tessaria borealis, @@\ An aromatic shrub about three feet high, 
owing in all the deserted beds of the Gila, and in the valléy. of 
fhe Del Norte; usually with the Frémontia, both of which are 
abundant in those regions. 
~Hymenocléa, Torr. and Gr. ined. Thisremarkablenew genus is 
allied to Ambrosia and Xanthium. Another species of it (H. Sal- 
ofa) was found in Frémont’s second expedition, which, with the. 
_ characters of the cess to which it belongs, will be published i in 
_ another work. species, from the scales of the involucre hee 
ina Single hed. we propose to call H. monogyra, Torr. and Gr... 
Tt was found in various parts of the valley of the Gila. 
Franséria Hookeriana. Wutt. (Yerba del Sapo.) 
Ambrosia acanthocarpa, Hooker. Very abundant from Santa Fé 
to the 33d parallel of latitude. 
Another species of this genus, and apparently an undescribed 
one, exists in the collection. It is suffrutescent hoary, with the 
leaves bipinnatifidly, ‘divided into very small obtuse segments. The 
owers are eegie| 
° 
