II. SYNCOTYLOUS RACES. 
9. HEMI-SYNCOTYLY, SYNCOTYLY, AMPHI-SYNCOTYLY. 
Alongside seedlings with split or double cotyledons 
there occur others, the seed-leaves of which have fused 
so as to form one single organ. They are, however, much 
rarer, but not so rare that they cannot be found every 
year, at least in some sowing or other. Tricotyls may 
be found in the proportion say, of one in a thousand, 
but syncotyls, as a rule, only one in tens of thousands 
of seedlings. 
In the sowings of 1895 which we have already men- 
tioned (p. 380), I found, amongst more than 250,000 
seedlings of 40 species, only 10 syncotyls as against 150 
tricotyls. Where they occur more abundantly this is due 
to inheritance, for as soon as the syncotyls are allowed 
to flower in isolation and their seeds are saved separately, 
it is found that they inherit their character in almost the 
same degree as do tricotyls. 
Instances of syncotyls were afforded me by Aster 
tenellus, Clarkia elegans, C. pulchella, Cerlnthe g\m- 
nandra, Chrysanthemum Myconis, Helichrysum bractea- 
tuin, Phaceliatanacetifolia, Silenehirsuta, Anagallis gran- 
diflora, Epilobium hirsutum, Hesperis niatronalis, Pent- 
stem on gentianoides, Robinia Pseud-Acacia, and many 
other forms; 1 but always in small proportions. A few 
1 Further instances are given by H. B. GRUPPY, Irregularity of 
Sonic Cotyledons, Science Gossip, N. S., Vol. II, 1895, p. 171. 
