[ 174 ] 316 , 



lanceolate chaffy scales, which are entire, or 2-toothed at the summit, and 

 furnished with a strong central nerve, which is produced into a short sca- 

 brous awn. — A humble, branching (and apparently annual) herb. Leaves 

 alternate, pinnatified, and somewhat fleshy, (destitute of glands ?) ; the lobes 

 and rachis linear. Heads terminal, solitary, nearly sessile, large, (about an 

 inch long,) with one or two involucrate leaves at the base. Corolla yellow." 



« Nicolletia occidentalis. Gray. 



On the banks of the Mohahve river, growing in naked sands ; flowering 

 in April. The plant has a powerful and rather agreeable odor. This in- 

 teresting genus (which is described from imperfect materials) belongs to 

 the tribe Senecionide^, and the sub-tribe Tagitineje. It has the habit of 

 Dissodia, and exhibits both the c*haffy pappus of the division Tagelese, and 

 the pappus pilosus of Porophy Hum.*— Gray. 



Franseria dumosa. Gray. 



Shrubby, much branched ; leaves pinnatified, canescent on both sides, as 

 are the branchlets ; the divisions 3 — 7, oval, entire, and somewhat lobed ; 

 heads rather loosely spiked ; involucre of the sterile flowers 5 — 7 -cleft, 

 sthgosely canescent ; of the fertile, ovoid, 2-celled, 2-flowered. 



A»shrub, 1 — 2 feet high, with divaricate rigid branches. Leaves scarce- 

 ly an inch long. Fertile (immature) involucre clothed with straight soft 

 lanceolate- subulate prickles, which are short and scale-like. 



On the sandy uplands of the Mohahve river, and very common in all 

 that region of North California. Flowering in April. 



Amsonia tomentosa. Torr. and Frem. 



Suffrutescent ; clothed with a dense whitish pubescence ; leaves lanceolate 

 and ovate -lanceolate, acute at each end ; segments of the calyx lanceolate- 

 subulate ; corolla slightly hairy externally. i 



Stems numerous, erect, 12 to IS inches high, woody, below simple or 

 branching. Leaves alternate ; the lowest small and spatulate, or reduced to 

 scales ; the others about 2 inches long, and varying from 4 to 8 lines in 

 breadth ; entire, acuminate at the base. Flowers in rather dense, some- 

 what fastigiate terminal clusters, nearly three-fourths of an inch long. Ca- 

 lyx about one-third the length of the corolla, 5-parted to the base ; the seg- 

 ments narrow and hairy. Corolla with the tube ventricose above : the seg- 

 ments ovate-oblong. Stamens included ; filaments short ; anthers ovate- 

 sagittate. Ovaries oblong, united below, distinct above, smooth ; style 

 slender ; stigma capitate, with a membranaceous collar at the base. 



The specimens of this plant were without tickets ; but they were prob- 

 ably collected west of the Rocky mountains. They were without fruit. 



Asclepias speciosa. Torr. in Jinn. Lye. New York, \\,p. 218. 



This (as was stated in the first report) is Ji. Douglasii of Hooker, well 

 figured in his Flora Boreali Americana, 2,t. 142. It has a wide range, be- 

 ing found on both sides of the Rocky mountains, and from the sources of 

 the St. Peter's to those of the Kansas and Canadian. The fruit was collected 

 from specimens on the banks of the Snake river. It is almost exactly like 

 that of A. Cornuti, being inflated, woolly, and covered with soft spines. 



* It should be stated here, that the notice of this genus by Dr. Gray was drawn up in Latin ; bu l 

 we have given it in English, that it may be uniform with our own description. 



