“ 
es 
143 [7] 
Ambrosia artemisiefolia, Linn. Bank of the Gila. : 
and Gr. A 
+ 
found in the valley of the Gila, and in the desert of drifting sands 
{as are also the petioles and branches) ; scales of the involucre lan- 
ceolate; pappus of 3 to 4 acute rigid teeth, one of which is longer 
than the others. Abundant on the western side of the Cordilleras 
of California. ; , 
Silphium laciniatum, Linn. (Pilot weed.) On the Arkansas and 
its tributaries. 
. Another Silphium, with large ovate undivided leaves, was found _ 
on Cariso cree 
Lepachys columnaris, Torr. and Gr. Rudbeckia columnaris, 
Pursh. The rays vary from being wholly yellow to entirely pur- 
plish brown. From the head waters of the Canadian to Santa Fé. 
Encelia farinosa, Gray ined. An aromatic shrubby plant; exu- 
ding a yellowish resin from the branches.. The leaves are ovate, 
sofly pubescent, and hoary on both sides, with 3 to 5 prominent 
reticulated nerves underneath. 
Helianthus petiolaris, JVuét. Upper part of the Arkansas, and 
valley of the Del Norte. . i 
HH. lenticularis, Dougl.. With the preceding. 
Coreopsis palmata, Wutt. Turkey creek. 
Simsia. A rayless, and probably new species of this genus, was 
found in the bed of the Agua Caliente, November 28th. It is a 
branching shrub, and the slender bark of the irregular twigs is cav- — 
ered with a whitish, very scabrous pubescence. The leaves are 
scarcely an inch long, ovate, entire, obtuse, with short petioles, 
‘scabrous on both sides. Chaff of the receptacle embracing 
the obovate achenium, the margin of which is furnished with long 
silky hairs. 
Wulfia.? Specimens of a plant with the floral characters of this 
genus, but with different foliage, were found in abundance on the 
higher grounds bordering the valley of the Gila. It also resembles 
Leighia, but is destitute of a pappus. Some of the genera, to’ 
which the plant is allied, will need revision before its place can be 
satisfactorily determined. ¥ Phe 
 Ximenesia, n. sp.?: Valley of the Del Norte, and along the Gila, 
‘September and October. This needs comparison with some of # io. 
Mexican species. It very nearly resembles X. enceltoides, Cavan. . 
“ Riddellia tagetina, Nutt. Torr. and Gr. fi., NW 2p. 362. 
alley the Del Norte, abouttwe hundred miles below Fé. 
= 
3 
re 
§ beautiful plant with persistent flowers, first detected by Mr, Nutt 
all towards the sources of the Platte. Pass ss 
Bamrya, n. gen. Harv. and Gr., ined. Two other species of — 
this unpublished genus, dedicated to that profound observer of na- 
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