PAPERS ON BOTANY 155 
b. 18.5 mm. high over all; 2 pairs foliage leaves, cotyledons 
persistent, but dried; fruit consisting of 8 full sized achenes 
as a result of the single flower. 
ce. 15 mm. over all, 3 pairs of leaves, 1 pair dried cotyle- 
dons, 3 achenes. 
d. 17.5 mm. over all, 3 flowers, cotyledons present but 
dried. 
e. 15 mm. over all, 1 large flower, 10 achenes. 
f. 10.5 mm. over all. 
In wet sand along the shore of Lake Maxinkuckee, during 
the autumns of 1904 and 1907, exceedingly small plants of 
this species, bearing only 3 or 4 leaves and a terminal flower 
were collected. It was frequent about some of the Biological 
Station ponds where plants reached normal size. This is given 
as 6’-3° high (Britton & Brown), or 2-9 dm. high (Robinson 
& Fernald. ) 
16. Bidens cernua L. Small or Nodding Burr-Marigold. 
Numerous examples along shore, one 30 mm. high with 2 
pairs of leaves, one of which are the cotyledons and tipped 
with a minute blossom. A second with a stem 14.5 mm. high, 
2 pairs of leaves, one of which are the cotyledons, and one 
blossom. Another, 19 mm. high, normal size “2’-3° high, con- 
sisting of many races differing in size’ (Britton & Brown). 
“2-7 dm. high, very variable.” (Robinson & Fernald.) 
17. Bidens frondosa L. Sticktight. 
Occasional along shore; it does not seem to be especially 
common in the locality away from the river. Known through 
many parts of the country as “Spanish-needles”’; a local ap- 
propriate name is “boot-jack.’’ Not so common as the for- 
mer; small plants are often noted growing in piles of lodged 
driftwood or on lodged logs out in the sloughs. One plant 
bore 4 leaves and 1 flower; the stem was very short but too 
crooked to measure exactly, Normal size “2°-3° high” (Brit- 
ton & Brown.) ‘Stems tall, 7 dm. or less in height.” (Rob- 
inson & Fernald. ) 
