L7]) 8 
Se . ‘ 
"These are beautiful objects under the microscope. They are spiral — 
yessels consisting of an extremely delicate sheath, containing the 
loosely coiled thread which frequently ramifies with anastomosing 
branches. The whole testa is formed of these singular vessels. 
Embryo nearly as large as.the seed; cotyledons foliaceous; radicle 
pointing downward. There can be little doubt of the propriety of 
uniting Bronnia and Fouquiera. Each genus was founded on a 
single species, and both plants seem to be very little known to Eu- 
ropean botanists, Of the former the flowers are imperfectly de- 
| wcribed, and of the latter, the fruitisunknown. Our plant partakes 
_~ of the characters of both genera. In the ovary the placente meet 
o 
in the axis, but only slightly cohere; finally they unite, but in 
fruit the valves of the capsule separate from the axis, to which the 
seeds remain attached. As to the affinities of Fouquiera, I am in- 
CONVOLVULACES, 
Ipomeea leptophylla, Torr. tm Frém. 1st report, p. 94. Upper 
part of the Arkansas and head waters of the Canadian. The stems 
are often erect, about two feet high, and of a bushy appearance. 
Ban the appearance of the specimens, I should suppose the plant 
were a perennial, but according to Dr. James itis an annual. _ 
Si. or two other Convolvulacee were in the collection, but 1 
have not determined them to my satisfaction. 
SOLANACES. 
x species of Solanum was found on the Del Norte below 
. The whole plant is, clothed with a dense yellowish 
bescence. The stems are rough, with minute slender 
_ Leaves linear- oblong, entire, rather obtuse, prickly — 
midrib. Flowers, two or three together at the summit | 
ches, white? stamens 5; -anthers: €qual: ooo See Por 
aS GENTIANACEA,. | ! alp 
ye af ~~ © ; e rice ee 
Russelianum, Don. Near the bank of the San - 4 
lant. 7 ee oe 
ars 
ae 
aS 
Bey E: tricantha 8. Griseb. Wal- 
el Norte, and along the Gila. 
