16 MISSOURI BOTANICAL GARDEN. 
PLANTS CULTIVATED. 
Species or varieties to the number of 900 were added to the 
living collections in the course of the year, and 590 forms 
were lost or discarded, making a net gain of 310, and bring- 
ing the total recorded as now in cultivation to 12,074, in con- 
trast with the 11,764 noted for 1909.1. These forms repre- 
sent 1,820 genera, belonging to 203 natural families,? a net 
addition of 43 genera and 6 families. 
Classified as to hardiness and other features of gardening 
interest, the collection now comprises 
Thallophytes —— ee aes eS 5 
Brvepngee | Se {errs = SSS 
PR 3 SG SS Se ee 
Spermatophytes 
Gymnosperms 
ae here SS 
SE. og 6g SS os eee ee 
Angiosperms 
Trees and shrubs. . ... . 1,715 
Hardy and annualherbs . . . 8,857 
Tender plants 
Oreliids .. . 1.4 oe 
Other Monocotyledons . — ae 
Dicotyledons . . . . . . 8,688 11,704 
12,074 
THE WEATHER. 
The season just closed (diagrams ‘A and B) has varied 
from the average in several respects,—on the whole unfavor- 
ably. Through most of the year the mean monthly tem- 
perature ran somewhat below the St. Louis average, exceeded 
materially only in March; but though the daily mean for 
April was normal, the month was marked by a severe freeze 
which wrought serious havoc with plants, all of which were in 
1 Rept. Mo. Bot. Gard. 21:12. 
? See list in Rept. Mo. Bot. Gard. 21: 12. — Two families lost (Em- 
petraceae and Loranthaceae). Eight families added (Callitrichaceae, 
Ceratophyllacae, Datiscaceae, Frankeniaceae, Globulariaceae, Goodeni- 
aceae, Isoetaceae, and Trochodendraceae). 
