26 JOHNSON: ForM OF PIAROPUS PANICULATUS 
MATERIAL 
From seed of P. paniculatus brought from Trinidad by Pro- 
fessor Hazen in the spring of 1920, several plants were grown in 
Fic. 2. Stalk of Piaropus pani- 
culatus with seventeen fine capsules 
all frcm illigitimate self-pollination. 
the New York Botanical Garden. 
From the seed of one of these a 
progeny of 17 plants was grown 
and from the seed of one of these 
another generation of 20 plants 
was grown. All these plants 
were definitely to be classed as 
mid-styled. 
RESULTS OF SELF-POLLINATIONS 
The 37 plants of the two gen- 
erations were all tested for seed 
production to controlled self- 
pollinations, using pollen from 
both sets of stamens. <A. total 
of 186 pollinations were made 
with pollen of long stamens, the 
number ranging from 1 to 18 
flowers per plant. Of these 157 
were successful, yielding from 8 
to 70 seeds per capsule and with 
an average of 31. 
A total of 118 self-pollina- 
tions were made with the pollen 
from short stamens. Of these 
therewere 24 failures and 94 suc- 
cesses that yielded pods, con- 
taining from 6 to 63 seeds per 
pod with the average at 36. 
One stalk of a highly self- 
compatible plant produced 13 
long-selfed pods and 4 short- 
selfed pods (see Fic. 2). The 
counts of seeds in the former 
were as follows: 32, 39, 41, 44+ 
47,51, 54, 56, 57, 58, 59, with an 
average of 50, while the counts for 3 of the short-selfed pods (seed 
lost from one of the four) were 35, 43, 61, with an average of 49. 
