66 
H. O. JUEL 
Sloane and Sherard might have contained numerous species 
from N. America. 
In 1735 Linnaeus was charged by G. Clifford with the 
superintendance of his garden at Hartecamp. When he left this 
situation in 1737 he had completed the comprehensive task of 
determining the numerous plants of the garden and arranging 
them according to his new system. The fruit of these labours 
was his »Hortus Cliffortianus » (1737), a large volume in folio 
with several copper plates. Here Linnaeus for the first time 
had the opportunity of applying his ideas on a large material of 
plants from all different quarters of the world, and this important 
work of his may in a way be called a forerunner to his Species 
plantarum. 
Of North American species the Hort. Cliff, contains almost 
170 species. Of these the following seem to have been new to 
the science: Arum (Peltandra) virginicum, Collinsonia canadensis , 
Diodia virginiana, Lobelia inflata, Monarda didyma. 
In Leiden Linnaeus met with the senator J. F. Gronovius, 
doctor of med. and a good botanist, whose friendship and pro¬ 
tection were very useful to Linnaeus during his visit in Holland. 
This man, the author of the first North American flora, had got 
possession of a large collection af plants from Virginia. A phy¬ 
sician in this English colony, J. Clayton, who was very much 
interested in botany, collected numerous plants and sent dried 
specimens of them to Gronovius. From this material the latter 
wrote his »Flora Virginica, exhibens plantas, quas nobilissimus 
vir D. J. Claytonius in Virginia crescentes observavit atque col- 
legit etc.» It is arranged in accordance to the sexual system of 
Linnaeus. The 1st vol. appeared in 1739, the 2nd in 1743. 
Both of them run through the whole system, from which it may 
be concluded that each of them corresponds to a particular col¬ 
lection of Clayton’s. In 1762 Gronovius’ son published a 2nd 
edition with the same title, in which additions and corrections 
are made according to later works dealing with plants from the 
same country, especially Linnaeus’ Spec, plant., although his spe¬ 
cific (»trivial») names are not used. 
