154 ILLINOIS ACADEMY OF SCIENCE 
12. Conobea multtfida (Michx.) Benth. Conobea. 
Only one plant found, it being only 24.6 mm. long and 
bearing several blossoms. Its natural habitat is said to be 
“long streams and shores.’”’ It does not appear to be common 
in the region. Britton & Brown give its dimensions at “4’-8 
high” and Britton’s Manual mentions it as being “1-2 dm. 
high, very leafy,’’ while Robinson & Fernald who do not men- 
tion size limits, speak of it as being “diffusely spreading, much- 
branched.” 
13. Illysanthes dubia (L.) Barnhart, Long-stalked False 
Pimpernel. 
Numerous minute plants were present. One had a stem 5.5 
mm. long and root about the same length, 6 leaves, 2 of them 
old, and shrivelled and probably representing the cotyledons, 
and 3 fruits. A second stemless plant had 4 leaves and 2 
fruits, a third was 8 mm. high and 3 had flowers and fruits 
and 8 broad leaves. A fourth of the robust type had the stem 
about 5 mm. with 7 broad leaves and 2 fruits. Normal size 
given as “3/-8 long” (Britton & Brown), or “1-3 dm, long 
(Robinson & Fernald. ) 
14. Ambrosia elatior L. Ragweed. 
The well known ragweed was represented by a few dwarfed 
but markedly fruitful examples, ranging from only about 75 
mm. high up to near the lower limits of the normal size. The 
normal size is given as from 1°-6° high (Britton & Brown), 
or .3-2.5 m. high (Robinson & Fernald). 
15. Verbesina alba L. Eclipta. 
This species, familiar to students of the floras of shores and 
borders of lakes often forms in favorable situations, tall well- 
branched plants. It was the most abundant of the dwarfed 
plants found along the stretch of shore under consideration. 
Between 100 and 150 examples of minute plants with only a 
tew leaves and tipped with a small flower or sometimes bearing 
also several axillary flowers, were observed. The following 
measurements are fair examples: 
a. 18.5 mm. in length, root and all, one branch, 4 leaves, 
one flower, aerial portion of plant 10 mm. high. 
