350 BOTANICAL GAZETTE [NOVEMBER 
3. Disk-florets—The polygon of distribution of the disk-florets 
is presented in fig. 10. The range, from 14 to 78, is so wide that 757 
heads are quite insufficient to make the many empirical modes of any 
| 
a 
| 
bi 
1S a 
= 
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if 
} 
| 
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a 
a 
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eR 
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ert 
Bee 
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it 
(HS Be ioe 
HERRERA e eRe eee 
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es 
Lt 
tee SB Gal Se Ds a 
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ECHR SRARREREREDASS 
BEG 3 OAS ERR Re SS 
Rake Bae SG ae eee Bae S 
Be eo ry) ee 
cong {8 MDs OBE AL BR OR ed Ss Se GR Se 
| 
70 30 40 60 70 
21 31 4) 6! ait 
: ; ; doubled; 
Fic. 10.—Disk-floret curve for 757 heads collected in 1903: sap 6 =9-793 
mean 44.933+ .238; empirical modes 38-39, 44-45, 59-515 50S?) "eo 
1 168. 
hat offered by 
2. " ble with t 
significance. To make the curve compara his still leaves 
thedisk-florets in 1900, the classes were doubled, but t 
